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and/or dev->hard_header_len\n\nIn this particular crash mld_newpack() allocated an skb\nwith a too small reserve/headroom, and by the time mld_sendpack()\nwas called, syzbot managed to attach an ip6gre device.\n\n[1]\nskbuff: skb_under_panic: text:ffffffff8a1d69a8 len:136 put:40 head:ffff888059bc7000 data:ffff888059bc6fe8 tail:0x70 end:0x6c0 dev:team0\n------------[ cut here ]------------\n kernel BUG at net/core/skbuff.c:213 !\n <TASK>\n skb_under_panic net/core/skbuff.c:223 [inline]\n skb_push+0xc3/0xe0 net/core/skbuff.c:2641\n ip6gre_header+0xc8/0x790 net/ipv6/ip6_gre.c:1371\n dev_hard_header include/linux/netdevice.h:3436 [inline]\n neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618\n neigh_output include/net/neighbour.h:556 [inline]\n ip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136\n __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]\n ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:220\n NF_HOOK_COND include/linux/netfilter.h:307 [inline]\n ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247\n NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318\n mld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855\n mld_send_cr net/ipv6/mcast.c:2154 [inline]\n mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693"}], "id": "CVE-2025-71098", "lastModified": "2026-03-25T16:56:02.323", "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": "2026-01-13T16:16:09.703", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": 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{"bugzilla": {"description": "kernel: ip6_gre: make ip6gre_header() robust", "id": "2429095", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429095"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nip6_gre: make ip6gre_header() robust\nOver the years, syzbot found many ways to crash the kernel\nin ip6gre_header() [1].\nThis involves team or bonding drivers ability to dynamically\nchange their dev->needed_headroom and/or dev->hard_header_len\nIn this particular crash mld_newpack() allocated an skb\nwith a too small reserve/headroom, and by the time mld_sendpack()\nwas called, syzbot managed to attach an ip6gre device.\n[1]\nskbuff: skb_under_panic: text:ffffffff8a1d69a8 len:136 put:40 head:ffff888059bc7000 data:ffff888059bc6fe8 tail:0x70 end:0x6c0 dev:team0\n------------[ cut here ]------------\nkernel BUG at net/core/skbuff.c:213 !\n<TASK>\nskb_under_panic net/core/skbuff.c:223 [inline]\nskb_push+0xc3/0xe0 net/core/skbuff.c:2641\nip6gre_header+0xc8/0x790 net/ipv6/ip6_gre.c:1371\ndev_hard_header include/linux/netdevice.h:3436 [inline]\nneigh_connected_output+0x286/0x460 net/core/neighbour.c:1618\nneigh_output include/net/neighbour.h:556 [inline]\nip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136\n__ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]\nip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:220\nNF_HOOK_COND include/linux/netfilter.h:307 [inline]\nip6_output+0x340/0x550 net/ipv6/ip6_output.c:247\nNF_HOOK+0x9e/0x380 include/linux/netfilter.h:318\nmld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855\nmld_send_cr net/ipv6/mcast.c:2154 [inline]\nmld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693"], "name": "CVE-2025-71098", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-71098\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-71098\nhttps://lore.kernel.org/linux-cve-announce/2026011344-CVE-2025-71098-ef6d@gregkh/T"], "threat_severity": "Moderate"}

{}