{"id":"CVE-2026-68127","title":"ila: reload IPv6 header after pskb_may_pull in checksum adjust","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nila: reload IPv6 header after pskb_may_pull in checksum adjust\n\nila_csum_adjust_transport() caches ip6h = ipv6_hdr(skb) before calling\npskb_may_pull(). On a non-linear …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < e451a904606c571f731ef7a06b3398619dce5300","Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < 1eadcb43893b897ade85ac5bf5c618054bc3c655","Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < ba353caafb06ccee57b78d3254e3cebf1dea4a93","Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < 896a9512d0d83c2a4b357e5585b7b62a8e3f95c1","Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < 7097a0280b178237265681be66d1bef11d15894b","Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < 472aba2603ca74c4f7722cb0c0296942b0776b8d","Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc","Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < 92d3817649df2b0b6a008a686c8275c88d7ef594","Linux 4.5"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:44:18.440814Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:52:58.280Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68127","references":[{"url":"https://git.kernel.org/stable/c/e451a904606c571f731ef7a06b3398619dce5300"},{"url":"https://git.kernel.org/stable/c/1eadcb43893b897ade85ac5bf5c618054bc3c655"},{"url":"https://git.kernel.org/stable/c/ba353caafb06ccee57b78d3254e3cebf1dea4a93"},{"url":"https://git.kernel.org/stable/c/896a9512d0d83c2a4b357e5585b7b62a8e3f95c1"},{"url":"https://git.kernel.org/stable/c/7097a0280b178237265681be66d1bef11d15894b"},{"url":"https://git.kernel.org/stable/c/472aba2603ca74c4f7722cb0c0296942b0776b8d"},{"url":"https://git.kernel.org/stable/c/c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc"},{"url":"https://git.kernel.org/stable/c/92d3817649df2b0b6a008a686c8275c88d7ef594"}],"tags":["cve.org"],"epss":0.00536,"epssPercentile":0.43957,"ingestedAt":"2026-10-16T17:24:46.846Z","slug":"CVE-2026-68127","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nila: reload IPv6 header after pskb_may_pull in checksum adjust\n\nila_csum_adjust_transport() caches ip6h = ipv6_hdr(skb) before calling\npskb_may_pull(). On a non-linear skb whose transport header sits in a page\nfragment, pskb_may_pull() can call __pskb_pull_tail() / pskb_expand_head()\nand free the old skb head, leaving ip6h dangling; the following\nget_csum_diff(ip6h, p) then reads freed memory. ila_update_ipv6_locator()\nuses ip6h (and the iaddr derived from it) again after the csum-adjust\ncall and additionally writes the new locator through that pointer.\n\nImpact: a remote IPv6 packet routed through a configured ILA\ncsum-adjust-transport route or receive-side mapping triggers a\nslab-use-after-free in ila_update_ipv6_locator() (KASAN). The route or\nmapping requires CAP_NET_ADMIN to configure, but trigger packets are\nunauthenticated once it exists.\n\nReload ip6h after each pskb_may_pull() in ila_csum_adjust_transport()\nbefore the csum-diff read. In ila_update_ipv6_locator() only the\nILA_CSUM_ADJUST_TRANSPORT case pulls the skb, so reload ip6h and iaddr in\nthat case alone before the destination-address write; the neutral-map\nmodes never pull and keep their cached pointers.\n\n## Affected\n\n- `Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < e451a904606c571f731ef7a06b3398619dce5300`\n- `Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < 1eadcb43893b897ade85ac5bf5c618054bc3c655`\n- `Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < ba353caafb06ccee57b78d3254e3cebf1dea4a93`\n- `Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < 896a9512d0d83c2a4b357e5585b7b62a8e3f95c1`\n- `Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < 7097a0280b178237265681be66d1bef11d15894b`\n- `Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < 472aba2603ca74c4f7722cb0c0296942b0776b8d`\n- `Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc`\n- `Linux >= 33f11d16142b06588eedfc1dd8cf93790979a712 < 92d3817649df2b0b6a008a686c8275c88d7ef594`\n- `Linux 4.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}