{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-56636", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T15:00:39.839Z", "datePublished": "2024-12-27T15:02:38.946Z", "dateUpdated": "2026-05-11T20:56:19.267Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:56:19.267Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngeneve: do not assume mac header is set in geneve_xmit_skb()\n\nWe should not assume mac header is set in output path.\n\nUse skb_eth_hdr() instead of eth_hdr() to fix the issue.\n\nsysbot reported the following :\n\n WARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 skb_mac_header include/linux/skbuff.h:3052 [inline]\n WARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 eth_hdr include/linux/if_ether.h:24 [inline]\n WARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 geneve_xmit_skb drivers/net/geneve.c:898 [inline]\n WARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 geneve_xmit+0x4c38/0x5730 drivers/net/geneve.c:1039\nModules linked in:\nCPU: 0 UID: 0 PID: 11635 Comm: syz.4.1423 Not tainted 6.12.0-syzkaller-10296-gaaf20f870da0 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\n RIP: 0010:skb_mac_header include/linux/skbuff.h:3052 [inline]\n RIP: 0010:eth_hdr include/linux/if_ether.h:24 [inline]\n RIP: 0010:geneve_xmit_skb drivers/net/geneve.c:898 [inline]\n RIP: 0010:geneve_xmit+0x4c38/0x5730 drivers/net/geneve.c:1039\nCode: 21 c6 02 e9 35 d4 ff ff e8 a5 48 4c fb 90 0f 0b 90 e9 fd f5 ff ff e8 97 48 4c fb 90 0f 0b 90 e9 d8 f5 ff ff e8 89 48 4c fb 90 <0f> 0b 90 e9 41 e4 ff ff e8 7b 48 4c fb 90 0f 0b 90 e9 cd e7 ff ff\nRSP: 0018:ffffc90003b2f870 EFLAGS: 00010283\nRAX: 000000000000037a RBX: 000000000000ffff RCX: ffffc9000dc3d000\nRDX: 0000000000080000 RSI: ffffffff86428417 RDI: 0000000000000003\nRBP: ffffc90003b2f9f0 R08: 0000000000000003 R09: 000000000000ffff\nR10: 000000000000ffff R11: 0000000000000002 R12: ffff88806603c000\nR13: 0000000000000000 R14: ffff8880685b2780 R15: 0000000000000e23\nFS: 00007fdc2deed6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000001b30a1dff8 CR3: 0000000056b8c000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n __netdev_start_xmit include/linux/netdevice.h:5002 [inline]\n netdev_start_xmit include/linux/netdevice.h:5011 [inline]\n __dev_direct_xmit+0x58a/0x720 net/core/dev.c:4490\n dev_direct_xmit include/linux/netdevice.h:3181 [inline]\n packet_xmit+0x1e4/0x360 net/packet/af_packet.c:285\n packet_snd net/packet/af_packet.c:3146 [inline]\n packet_sendmsg+0x2700/0x5660 net/packet/af_packet.c:3178\n sock_sendmsg_nosec net/socket.c:711 [inline]\n __sock_sendmsg net/socket.c:726 [inline]\n __sys_sendto+0x488/0x4f0 net/socket.c:2197\n __do_sys_sendto net/socket.c:2204 [inline]\n __se_sys_sendto net/socket.c:2200 [inline]\n __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2200\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/geneve.c"], "versions": [{"version": "a025fb5f49ad38cf749753b16fcd031d0d678f2b", "lessThan": "d9fa09ca004befe9cf826d6820439cb6f93cecd7", "status": "affected", "versionType": "git"}, {"version": "a025fb5f49ad38cf749753b16fcd031d0d678f2b", "lessThan": "b65958284401016b983078c68f70b047537f4aba", "status": "affected", "versionType": "git"}, {"version": "a025fb5f49ad38cf749753b16fcd031d0d678f2b", "lessThan": "2ee7bdc7cb40abfe658a71fbd10c7db2f4fc4f9a", "status": "affected", "versionType": "git"}, {"version": "a025fb5f49ad38cf749753b16fcd031d0d678f2b", "lessThan": "97ce3a4ec55eac6b5e2949ffb04028d604afda3b", "status": "affected", "versionType": "git"}, {"version": "a025fb5f49ad38cf749753b16fcd031d0d678f2b", "lessThan": "177b72ed7c77b11e46dd4336d73a87a77a5603af", "status": "affected", "versionType": "git"}, {"version": "a025fb5f49ad38cf749753b16fcd031d0d678f2b", "lessThan": "8588c99c7d47448fcae39e3227d6e2bb97aad86d", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/geneve.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.231", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.174", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.120", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.66", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.5", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.10.231"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.174"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.120"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.66"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d9fa09ca004befe9cf826d6820439cb6f93cecd7"}, {"url": "https://git.kernel.org/stable/c/b65958284401016b983078c68f70b047537f4aba"}, {"url": "https://git.kernel.org/stable/c/2ee7bdc7cb40abfe658a71fbd10c7db2f4fc4f9a"}, {"url": "https://git.kernel.org/stable/c/97ce3a4ec55eac6b5e2949ffb04028d604afda3b"}, {"url": "https://git.kernel.org/stable/c/177b72ed7c77b11e46dd4336d73a87a77a5603af"}, {"url": "https://git.kernel.org/stable/c/8588c99c7d47448fcae39e3227d6e2bb97aad86d"}], "title": "geneve: do not assume mac header is set in geneve_xmit_skb()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:51:35.808Z"}}]}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E85981F8-CFCD-412D-8B84-C2EB7C53C28B", "versionEndExcluding": "5.10.231", "versionStartIncluding": "5.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "419FD073-1517-4FD5-8158-F94BC68A1E89", "versionEndExcluding": "5.15.174", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "09AC6122-E2A4-40FE-9D33-268A1B2EC265", "versionEndExcluding": "6.1.120", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "29A976AD-B9AB-4A95-9F08-7669F8847EB9", "versionEndExcluding": "6.6.66", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9501D045-7A94-42CA-8B03-821BE94A65B7", "versionEndExcluding": "6.12.5", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngeneve: do not assume mac header is set in geneve_xmit_skb()\n\nWe should not assume mac header is set in output path.\n\nUse skb_eth_hdr() instead of eth_hdr() to fix the issue.\n\nsysbot reported the following :\n\n WARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 skb_mac_header include/linux/skbuff.h:3052 [inline]\n WARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 eth_hdr include/linux/if_ether.h:24 [inline]\n WARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 geneve_xmit_skb drivers/net/geneve.c:898 [inline]\n WARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 geneve_xmit+0x4c38/0x5730 drivers/net/geneve.c:1039\nModules linked in:\nCPU: 0 UID: 0 PID: 11635 Comm: syz.4.1423 Not tainted 6.12.0-syzkaller-10296-gaaf20f870da0 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\n RIP: 0010:skb_mac_header include/linux/skbuff.h:3052 [inline]\n RIP: 0010:eth_hdr include/linux/if_ether.h:24 [inline]\n RIP: 0010:geneve_xmit_skb drivers/net/geneve.c:898 [inline]\n RIP: 0010:geneve_xmit+0x4c38/0x5730 drivers/net/geneve.c:1039\nCode: 21 c6 02 e9 35 d4 ff ff e8 a5 48 4c fb 90 0f 0b 90 e9 fd f5 ff ff e8 97 48 4c fb 90 0f 0b 90 e9 d8 f5 ff ff e8 89 48 4c fb 90 <0f> 0b 90 e9 41 e4 ff ff e8 7b 48 4c fb 90 0f 0b 90 e9 cd e7 ff ff\nRSP: 0018:ffffc90003b2f870 EFLAGS: 00010283\nRAX: 000000000000037a RBX: 000000000000ffff RCX: ffffc9000dc3d000\nRDX: 0000000000080000 RSI: ffffffff86428417 RDI: 0000000000000003\nRBP: ffffc90003b2f9f0 R08: 0000000000000003 R09: 000000000000ffff\nR10: 000000000000ffff R11: 0000000000000002 R12: ffff88806603c000\nR13: 0000000000000000 R14: ffff8880685b2780 R15: 0000000000000e23\nFS: 00007fdc2deed6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000001b30a1dff8 CR3: 0000000056b8c000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n __netdev_start_xmit include/linux/netdevice.h:5002 [inline]\n netdev_start_xmit include/linux/netdevice.h:5011 [inline]\n __dev_direct_xmit+0x58a/0x720 net/core/dev.c:4490\n dev_direct_xmit include/linux/netdevice.h:3181 [inline]\n packet_xmit+0x1e4/0x360 net/packet/af_packet.c:285\n packet_snd net/packet/af_packet.c:3146 [inline]\n packet_sendmsg+0x2700/0x5660 net/packet/af_packet.c:3178\n sock_sendmsg_nosec net/socket.c:711 [inline]\n __sock_sendmsg net/socket.c:726 [inline]\n __sys_sendto+0x488/0x4f0 net/socket.c:2197\n __do_sys_sendto net/socket.c:2204 [inline]\n __se_sys_sendto net/socket.c:2200 [inline]\n __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2200\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: geneve: no suponga que el encabezado mac est\u00e1 configurado en geneve_xmit_skb() No debemos asumir que el encabezado mac est\u00e1 configurado en la ruta de salida. Utilice skb_eth_hdr() en lugar de eth_hdr() para solucionar el problema. sysbot inform\u00f3 lo siguiente: ADVERTENCIA: CPU: 0 PID: 11635 en include/linux/skbuff.h:3052 skb_mac_header include/linux/skbuff.h:3052 [en l\u00ednea] ADVERTENCIA: CPU: 0 PID: 11635 en include/linux/skbuff.h:3052 eth_hdr include/linux/if_ether.h:24 [en l\u00ednea] ADVERTENCIA: CPU: 0 PID: 11635 en include/linux/skbuff.h:3052 geneve_xmit_skb drivers/net/geneve.c:898 [en l\u00ednea] ADVERTENCIA: CPU: 0 PID: 11635 en include/linux/skbuff.h:3052 geneve_xmit+0x4c38/0x5730 drivers/net/geneve.c:1039 M\u00f3dulos vinculados en: CPU: 0 UID: 0 PID: 11635 Comm: syz.4.1423 No contaminado 6.12.0-syzkaller-10296-gaaf20f870da0 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 13/09/2024 RIP: 0010:skb_mac_header include/linux/skbuff.h:3052 [en l\u00ednea] RIP: 0010:eth_hdr include/linux/if_ether.h:24 [en l\u00ednea] RIP: 0010:geneve_xmit_skb drivers/net/geneve.c:898 [en l\u00ednea] RIP: 0010:geneve_xmit+0x4c38/0x5730 drivers/net/geneve.c:1039 C\u00f3digo: 21 c6 02 e9 35 d4 ff ff e8 a5 48 4c fb 90 0f 0b 90 e9 fd f5 ff ff e8 97 48 4c fb 90 0f 0b 90 e9 d8 f5 ff ff e8 89 48 4c fb 90 &lt;0f&gt; 0b 90 e9 41 e4 ff ff e8 7b 48 4c fb 90 0f 0b 90 e9 cd e7 ff ff RSP: 0018:ffffc90003b2f870 EFLAGS: 00010283 RAX: 000000000000037a RBX: 000000000000ffff RCX: ffffc9000dc3d000 RDX: 0000000000080000 RSI: ffffffff86428417 RDI: 0000000000000003 RBP: ffffc90003b2f9f0 R08: 000000000000003 R09: 000000000000ffff R10: 000000000000ffff R11: 000000000000002 R12: ffff88806603c000 R13: 0000000000000000 R14: ffff8880685b2780 R15: 0000000000000e23 FS: 00007fdc2deed6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30a1dff8 CR3: 0000000056b8c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas: __netdev_start_xmit include/linux/netdevice.h:5002 [en l\u00ednea] netdev_start_xmit include/linux/netdevice.h:5011 [en l\u00ednea] __dev_direct_xmit+0x58a/0x720 net/core/dev.c:4490 dev_direct_xmit include/linux/netdevice.h:3181 [en l\u00ednea] packet_xmit+0x1e4/0x360 net/packet/af_packet.c:285 packet_snd net/packet/af_packet.c:3146 [en l\u00ednea] packet_sendmsg+0x2700/0x5660 net/packet/af_packet.c:3178 sock_sendmsg_nosec net/socket.c:711 [en l\u00ednea] __sock_sendmsg net/socket.c:726 [en l\u00ednea] __sys_sendto+0x488/0x4f0 net/socket.c:2197 __do_sys_sendto net/socket.c:2204 [en l\u00ednea] __se_sys_sendto net/socket.c:2200 [en l\u00ednea] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2200 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] hacer_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entrada_SYSCALL_64_after_hwframe+0x77/0x7f"}], "id": "CVE-2024-56636", "lastModified": "2025-11-03T21:18:12.093", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-12-27T15:15:23.320", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/177b72ed7c77b11e46dd4336d73a87a77a5603af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2ee7bdc7cb40abfe658a71fbd10c7db2f4fc4f9a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8588c99c7d47448fcae39e3227d6e2bb97aad86d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/97ce3a4ec55eac6b5e2949ffb04028d604afda3b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b65958284401016b983078c68f70b047537f4aba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d9fa09ca004befe9cf826d6820439cb6f93cecd7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: geneve: do not assume mac header is set in geneve_xmit_skb()", "id": "2334531", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334531"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-241", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ngeneve: do not assume mac header is set in geneve_xmit_skb()\nWe should not assume mac header is set in output path.\nUse skb_eth_hdr() instead of eth_hdr() to fix the issue.\nsysbot reported the following :\nWARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 skb_mac_header include/linux/skbuff.h:3052 [inline]\nWARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 eth_hdr include/linux/if_ether.h:24 [inline]\nWARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 geneve_xmit_skb drivers/net/geneve.c:898 [inline]\nWARNING: CPU: 0 PID: 11635 at include/linux/skbuff.h:3052 geneve_xmit+0x4c38/0x5730 drivers/net/geneve.c:1039\nModules linked in:\nCPU: 0 UID: 0 PID: 11635 Comm: syz.4.1423 Not tainted 6.12.0-syzkaller-10296-gaaf20f870da0 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nRIP: 0010:skb_mac_header include/linux/skbuff.h:3052 [inline]\nRIP: 0010:eth_hdr include/linux/if_ether.h:24 [inline]\nRIP: 0010:geneve_xmit_skb drivers/net/geneve.c:898 [inline]\nRIP: 0010:geneve_xmit+0x4c38/0x5730 drivers/net/geneve.c:1039\nCode: 21 c6 02 e9 35 d4 ff ff e8 a5 48 4c fb 90 0f 0b 90 e9 fd f5 ff ff e8 97 48 4c fb 90 0f 0b 90 e9 d8 f5 ff ff e8 89 48 4c fb 90 <0f> 0b 90 e9 41 e4 ff ff e8 7b 48 4c fb 90 0f 0b 90 e9 cd e7 ff ff\nRSP: 0018:ffffc90003b2f870 EFLAGS: 00010283\nRAX: 000000000000037a RBX: 000000000000ffff RCX: ffffc9000dc3d000\nRDX: 0000000000080000 RSI: ffffffff86428417 RDI: 0000000000000003\nRBP: ffffc90003b2f9f0 R08: 0000000000000003 R09: 000000000000ffff\nR10: 000000000000ffff R11: 0000000000000002 R12: ffff88806603c000\nR13: 0000000000000000 R14: ffff8880685b2780 R15: 0000000000000e23\nFS: 00007fdc2deed6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000001b30a1dff8 CR3: 0000000056b8c000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n<TASK>\n__netdev_start_xmit include/linux/netdevice.h:5002 [inline]\nnetdev_start_xmit include/linux/netdevice.h:5011 [inline]\n__dev_direct_xmit+0x58a/0x720 net/core/dev.c:4490\ndev_direct_xmit include/linux/netdevice.h:3181 [inline]\npacket_xmit+0x1e4/0x360 net/packet/af_packet.c:285\npacket_snd net/packet/af_packet.c:3146 [inline]\npacket_sendmsg+0x2700/0x5660 net/packet/af_packet.c:3178\nsock_sendmsg_nosec net/socket.c:711 [inline]\n__sock_sendmsg net/socket.c:726 [inline]\n__sys_sendto+0x488/0x4f0 net/socket.c:2197\n__do_sys_sendto net/socket.c:2204 [inline]\n__se_sys_sendto net/socket.c:2200 [inline]\n__x64_sys_sendto+0xe0/0x1c0 net/socket.c:2200\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f", "A flaw was found in the Geneve tunneling implementation of the Linux kernel. In the geneve_xmit_skb() function, the kernel incorrectly assumes that the MAC header is set, leading to invalid memory access when it is not. This issue can be triggered when sending packets through a Geneve tunnel, resulting in warnings or crashes. A local attacker could exploit this by crafting specific network traffic to cause a denial of service, affecting system availability."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, prevent module geneve from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically."}, "name": "CVE-2024-56636", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-12-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56636\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56636\nhttps://lore.kernel.org/linux-cve-announce/2024122735-CVE-2024-56636-cdeb@gregkh/T"], "statement": "The bug could happen when local user sending packet using geneve virtual interfaces that provide Layer 2 Networks over Layer 3 Networks. It doesn't lead to kernel crash, but handled as hardware driver failure that leads to Linux kernel tainted state. The security impact is limited, because no known vector of attack apart from deny of service.", "threat_severity": "Moderate"}

{"created": "2025-07-12T22:31:44.106845+00:00", "updated": "2025-07-12T22:31:44.106899+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}