{"id":"CVE-2026-68127","summary":"ila: reload IPv6 header after pskb_may_pull in checksum adjust","details":"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 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.","modified":"2026-08-21T03:30:40.547258259Z","published":"2026-08-10T11:58:48.489Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68127.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1eadcb43893b897ade85ac5bf5c618054bc3c655"},{"type":"WEB","url":"https://git.kernel.org/stable/c/472aba2603ca74c4f7722cb0c0296942b0776b8d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7097a0280b178237265681be66d1bef11d15894b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/896a9512d0d83c2a4b357e5585b7b62a8e3f95c1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/92d3817649df2b0b6a008a686c8275c88d7ef594"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ba353caafb06ccee57b78d3254e3cebf1dea4a93"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e451a904606c571f731ef7a06b3398619dce5300"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68127.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68127"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"33f11d16142b06588eedfc1dd8cf93790979a712"},{"fixed":"e451a904606c571f731ef7a06b3398619dce5300"},{"fixed":"1eadcb43893b897ade85ac5bf5c618054bc3c655"},{"fixed":"ba353caafb06ccee57b78d3254e3cebf1dea4a93"},{"fixed":"896a9512d0d83c2a4b357e5585b7b62a8e3f95c1"},{"fixed":"7097a0280b178237265681be66d1bef11d15894b"},{"fixed":"472aba2603ca74c4f7722cb0c0296942b0776b8d"},{"fixed":"c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc"},{"fixed":"92d3817649df2b0b6a008a686c8275c88d7ef594"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68127.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68127.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}