{"id":"CVE-2025-71098","revision":"ff82075c36b1494dbfd06bfd383e30e6","records":[{"revision":"ff82075c36b1494dbfd06bfd383e30e6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-71098","aliases":[],"title":"ip6_gre: make ip6gre_header() robust","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_gre: make ip6gre_header() robust\n\nOver the years, syzbot found many ways to crash the kernel\nin ip6gre_header() [1].\n\nThis involves team or bonding drivers ability to dynamically\nchange their dev->needed_headroom 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","state":0,"publishedAt":"2026-01-13T15:34:57.536+00:00","modifiedAt":"2026-10-19T18:15:12.91+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv6/ip6_gre.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c12b395a46646bab69089ce7016ac78177f6001f\",\n                            \"lessThan\": \"17e7386234f740f3e7d5e58a47b5847ea34c3bc2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c12b395a46646bab69089ce7016ac78177f6001f\",\n                            \"lessThan\": \"41a1a3140aff295dee8063906f70a514548105e8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c12b395a46646bab69089ce7016ac78177f6001f\",\n                            \"lessThan\": \"adee129db814474f2f81207bd182bf343832a52e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c12b395a46646bab69089ce7016ac78177f6001f\",\n                            \"lessThan\": \"1717357007db150c2d703f13f5695460e960f26c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c12b395a46646bab69089ce7016ac78177f6001f\",\n                            \"lessThan\": \"5fe210533e3459197eabfdbf97327dacbdc04d60\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c12b395a46646bab69089ce7016ac78177f6001f\",\n                            \"lessThan\": \"91a2b25be07ce1a7549ceebbe82017551d2eec92\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c12b395a46646bab69089ce7016ac78177f6001f\",\n                            \"lessThan\": \"db5b4e39c4e63700c68a7e65fc4e1f1375273476\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv6/ip6_gre.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.248\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.198\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.160\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.120\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.64\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.4\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/17e7386234f740f3e7d5e58a47b5847ea34c3bc2","https://git.kernel.org/stable/c/41a1a3140aff295dee8063906f70a514548105e8","https://git.kernel.org/stable/c/adee129db814474f2f81207bd182bf343832a52e","https://git.kernel.org/stable/c/1717357007db150c2d703f13f5695460e960f26c","https://git.kernel.org/stable/c/5fe210533e3459197eabfdbf97327dacbdc04d60","https://git.kernel.org/stable/c/91a2b25be07ce1a7549ceebbe82017551d2eec92","https://git.kernel.org/stable/c/db5b4e39c4e63700c68a7e65fc4e1f1375273476"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-71098","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-71098","identifiers":["CVE-2025-71098"]},"retained":false,"historicalAffected":[]}],"coverage":[]}