{"id":"CVE-2025-71098","title":"ip6_gre: make ip6gre_header() robust","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= c12b395a46646bab69089ce7016ac78177f6001f < 17e7386234f740f3e7d5e58a47b5847ea34c3bc2","Linux >= c12b395a46646bab69089ce7016ac78177f6001f < 41a1a3140aff295dee8063906f70a514548105e8","Linux >= c12b395a46646bab69089ce7016ac78177f6001f < adee129db814474f2f81207bd182bf343832a52e","Linux >= c12b395a46646bab69089ce7016ac78177f6001f < 1717357007db150c2d703f13f5695460e960f26c","Linux >= c12b395a46646bab69089ce7016ac78177f6001f < 5fe210533e3459197eabfdbf97327dacbdc04d60","Linux >= c12b395a46646bab69089ce7016ac78177f6001f < 91a2b25be07ce1a7549ceebbe82017551d2eec92","Linux >= c12b395a46646bab69089ce7016ac78177f6001f < db5b4e39c4e63700c68a7e65fc4e1f1375273476","Linux 3.7"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T20:41:13.938305Z"},"published":"2026-01-13","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:43:51.924Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-71098","references":[{"url":"https://git.kernel.org/stable/c/17e7386234f740f3e7d5e58a47b5847ea34c3bc2"},{"url":"https://git.kernel.org/stable/c/41a1a3140aff295dee8063906f70a514548105e8"},{"url":"https://git.kernel.org/stable/c/adee129db814474f2f81207bd182bf343832a52e"},{"url":"https://git.kernel.org/stable/c/1717357007db150c2d703f13f5695460e960f26c"},{"url":"https://git.kernel.org/stable/c/5fe210533e3459197eabfdbf97327dacbdc04d60"},{"url":"https://git.kernel.org/stable/c/91a2b25be07ce1a7549ceebbe82017551d2eec92"},{"url":"https://git.kernel.org/stable/c/db5b4e39c4e63700c68a7e65fc4e1f1375273476"}],"tags":["cve.org"],"epss":0.00134,"epssPercentile":0.03251,"ingestedAt":"2026-09-08T15:33:26.995Z","slug":"CVE-2025-71098","body":"## Overview\n\nIn 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\n\n## Affected\n\n- `Linux >= c12b395a46646bab69089ce7016ac78177f6001f < 17e7386234f740f3e7d5e58a47b5847ea34c3bc2`\n- `Linux >= c12b395a46646bab69089ce7016ac78177f6001f < 41a1a3140aff295dee8063906f70a514548105e8`\n- `Linux >= c12b395a46646bab69089ce7016ac78177f6001f < adee129db814474f2f81207bd182bf343832a52e`\n- `Linux >= c12b395a46646bab69089ce7016ac78177f6001f < 1717357007db150c2d703f13f5695460e960f26c`\n- `Linux >= c12b395a46646bab69089ce7016ac78177f6001f < 5fe210533e3459197eabfdbf97327dacbdc04d60`\n- `Linux >= c12b395a46646bab69089ce7016ac78177f6001f < 91a2b25be07ce1a7549ceebbe82017551d2eec92`\n- `Linux >= c12b395a46646bab69089ce7016ac78177f6001f < db5b4e39c4e63700c68a7e65fc4e1f1375273476`\n- `Linux 3.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}