{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2023-53517", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-01T11:39:39.406Z", "datePublished": "2025-10-01T11:46:04.673Z", "dateUpdated": "2026-05-11T19:46:30.332Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:46:30.332Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: do not update mtu if msg_max is too small in mtu negotiation\n\nWhen doing link mtu negotiation, a malicious peer may send Activate msg\nwith a very small mtu, e.g. 4 in Shuang's testing, without checking for\nthe minimum mtu, l->mtu will be set to 4 in tipc_link_proto_rcv(), then\nn->links[bearer_id].mtu is set to 4294967228, which is a overflow of\n'4 - INT_H_SIZE - EMSG_OVERHEAD' in tipc_link_mss().\n\nWith tipc_link.mtu = 4, tipc_link_xmit() kept printing the warning:\n\n tipc: Too large msg, purging xmit list 1 5 0 40 4!\n tipc: Too large msg, purging xmit list 1 15 0 60 4!\n\nAnd with tipc_link_entry.mtu 4294967228, a huge skb was allocated in\nnamed_distribute(), and when purging it in tipc_link_xmit(), a crash\nwas even caused:\n\n general protection fault, probably for non-canonical address 0x2100001011000dd: 0000 [#1] PREEMPT SMP PTI\n CPU: 0 PID: 0 Comm: swapper/0 Kdump: loaded Not tainted 6.3.0.neta #19\n RIP: 0010:kfree_skb_list_reason+0x7e/0x1f0\n Call Trace:\n <IRQ>\n skb_release_data+0xf9/0x1d0\n kfree_skb_reason+0x40/0x100\n tipc_link_xmit+0x57a/0x740 [tipc]\n tipc_node_xmit+0x16c/0x5c0 [tipc]\n tipc_named_node_up+0x27f/0x2c0 [tipc]\n tipc_node_write_unlock+0x149/0x170 [tipc]\n tipc_rcv+0x608/0x740 [tipc]\n tipc_udp_recv+0xdc/0x1f0 [tipc]\n udp_queue_rcv_one_skb+0x33e/0x620\n udp_unicast_rcv_skb.isra.72+0x75/0x90\n __udp4_lib_rcv+0x56d/0xc20\n ip_protocol_deliver_rcu+0x100/0x2d0\n\nThis patch fixes it by checking the new mtu against tipc_bearer_min_mtu(),\nand not updating mtu if it is too small."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/tipc/link.c"], "versions": [{"version": "ed193ece2649c194a87a9d8470195760d367c075", "lessThan": "2bd4ff4ffb92113f8acd04dbaed83269172c24b4", "status": "affected", "versionType": "git"}, {"version": "ed193ece2649c194a87a9d8470195760d367c075", "lessThan": "575e84d90a74c0b091b3417ba763ebb237aa0a8c", "status": "affected", "versionType": "git"}, {"version": "ed193ece2649c194a87a9d8470195760d367c075", "lessThan": "259683001d7e879fea4b42084fb6560dd9408a7e", "status": "affected", "versionType": "git"}, {"version": "ed193ece2649c194a87a9d8470195760d367c075", "lessThan": "1dd7ae5e0cf5a56e513f7ab7ab9570b7496281d2", "status": "affected", "versionType": "git"}, {"version": "ed193ece2649c194a87a9d8470195760d367c075", "lessThan": "56077b56cd3fb78e1c8619e29581ba25a5c55e86", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/tipc/link.c"], "versions": [{"version": "4.1", "status": "affected"}, {"version": "0", "lessThan": "4.1", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.181", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.113", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.30", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.3.4", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.4", "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": "4.1", "versionEndExcluding": "5.10.181"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "5.15.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.1.30"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.3.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2bd4ff4ffb92113f8acd04dbaed83269172c24b4"}, {"url": "https://git.kernel.org/stable/c/575e84d90a74c0b091b3417ba763ebb237aa0a8c"}, {"url": "https://git.kernel.org/stable/c/259683001d7e879fea4b42084fb6560dd9408a7e"}, {"url": "https://git.kernel.org/stable/c/1dd7ae5e0cf5a56e513f7ab7ab9570b7496281d2"}, {"url": "https://git.kernel.org/stable/c/56077b56cd3fb78e1c8619e29581ba25a5c55e86"}], "title": "tipc: do not update mtu if msg_max is too small in mtu negotiation", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1388B591-CF69-4E23-BD2F-A7050EE7E84C", "versionEndExcluding": "5.10.181", "versionStartIncluding": "4.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F3D5E1B5-AB9D-4ECC-8F11-F3E1BF761E27", "versionEndExcluding": "5.15.113", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E9430E62-03EA-42E6-9E5E-BD1D5124D107", "versionEndExcluding": "6.1.30", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "26C54BF0-3EED-46D4-92A7-5F07F658B49B", "versionEndExcluding": "6.3.4", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.4:rc1:*:*:*:*:*:*", "matchCriteriaId": "38BC6744-7D25-4C02-9966-B224CD071D30", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.4:rc2:*:*:*:*:*:*", "matchCriteriaId": "76061B41-CAE9-4467-BEDE-0FFC7956F2A1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: do not update mtu if msg_max is too small in mtu negotiation\n\nWhen doing link mtu negotiation, a malicious peer may send Activate msg\nwith a very small mtu, e.g. 4 in Shuang's testing, without checking for\nthe minimum mtu, l->mtu will be set to 4 in tipc_link_proto_rcv(), then\nn->links[bearer_id].mtu is set to 4294967228, which is a overflow of\n'4 - INT_H_SIZE - EMSG_OVERHEAD' in tipc_link_mss().\n\nWith tipc_link.mtu = 4, tipc_link_xmit() kept printing the warning:\n\n tipc: Too large msg, purging xmit list 1 5 0 40 4!\n tipc: Too large msg, purging xmit list 1 15 0 60 4!\n\nAnd with tipc_link_entry.mtu 4294967228, a huge skb was allocated in\nnamed_distribute(), and when purging it in tipc_link_xmit(), a crash\nwas even caused:\n\n general protection fault, probably for non-canonical address 0x2100001011000dd: 0000 [#1] PREEMPT SMP PTI\n CPU: 0 PID: 0 Comm: swapper/0 Kdump: loaded Not tainted 6.3.0.neta #19\n RIP: 0010:kfree_skb_list_reason+0x7e/0x1f0\n Call Trace:\n <IRQ>\n skb_release_data+0xf9/0x1d0\n kfree_skb_reason+0x40/0x100\n tipc_link_xmit+0x57a/0x740 [tipc]\n tipc_node_xmit+0x16c/0x5c0 [tipc]\n tipc_named_node_up+0x27f/0x2c0 [tipc]\n tipc_node_write_unlock+0x149/0x170 [tipc]\n tipc_rcv+0x608/0x740 [tipc]\n tipc_udp_recv+0xdc/0x1f0 [tipc]\n udp_queue_rcv_one_skb+0x33e/0x620\n udp_unicast_rcv_skb.isra.72+0x75/0x90\n __udp4_lib_rcv+0x56d/0xc20\n ip_protocol_deliver_rcu+0x100/0x2d0\n\nThis patch fixes it by checking the new mtu against tipc_bearer_min_mtu(),\nand not updating mtu if it is too small."}], "id": "CVE-2023-53517", "lastModified": "2026-04-06T13:07:54.593", "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": "2025-10-01T12:15:55.873", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1dd7ae5e0cf5a56e513f7ab7ab9570b7496281d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/259683001d7e879fea4b42084fb6560dd9408a7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2bd4ff4ffb92113f8acd04dbaed83269172c24b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/56077b56cd3fb78e1c8619e29581ba25a5c55e86"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/575e84d90a74c0b091b3417ba763ebb237aa0a8c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: tipc: do not update mtu if msg_max is too small in mtu negotiation", "id": "2400721", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2400721"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-53517", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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"}, {"cpe": "cpe:/o:redhat:rhivos:1", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat In-Vehicle Operating System 1"}], "public_date": "2025-10-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53517\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53517\nhttps://lore.kernel.org/linux-cve-announce/2025100132-CVE-2023-53517-da77@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-02T08:38:33.228911+00:00", "updated": "2025-10-02T08:38:33.228963+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}