{"id":"CVE-2026-68426","summary":"xfrm: fix stale skb-\u003eprev after async crypto steals a GSO segment","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix stale skb-\u003eprev after async crypto steals a GSO segment\n\nskb_gso_segment() leaves the segment list head with -\u003eprev pointing at\nthe last segment, an invariant validate_xmit_skb_list() relies on when\nit sets its tail pointer (tail = skb-\u003eprev).\n\nWhen validate_xmit_xfrm() walks a GSO list and some segments are stolen\nby async crypto (-\u003exmit() returns -EINPROGRESS), those segments are\nunlinked from the list but the head -\u003eprev is never updated.  If the\nlast segment is the one stolen, the returned head still has -\u003eprev\npointing at it, even though it is now owned by the crypto engine and may\nbe freed.  validate_xmit_skb_list() later does tail-\u003enext = skb, writing\nthrough that stale pointer -- a use-after-free.\n\nRepoint skb-\u003eprev at the last retained segment before returning.","modified":"2026-11-03T13:27:00.921123477Z","published":"2026-08-10T12:04:46.945Z","related":["ALSA-2026:67471","ALSA-2026:68531","ALSA-2026:68532","ALSA-2026:68570","SUSE-SU-2026:23477-1","SUSE-SU-2026:23481-1","SUSE-SU-2026:23528-1","SUSE-SU-2026:23529-1","SUSE-SU-2026:23881-1","SUSE-SU-2026:23887-1","SUSE-SU-2026:23897-1","SUSE-SU-2026:23902-1","SUSE-SU-2026:4120-1","SUSE-SU-2026:4254-1","SUSE-SU-2026:4279-1","SUSE-SU-2026:4282-1","SUSE-SU-2026:4284-1","SUSE-SU-2026:4347-1","SUSE-SU-2026:4369-1","SUSE-SU-2026:4595-1","SUSE-SU-2026:4969-1","SUSE-SU-2026:4972-1","SUSE-SU-2026:4977-1","SUSE-SU-2026:4978-1","SUSE-SU-2026:4979-1","SUSE-SU-2026:4983-1","SUSE-SU-2026:4984-1","SUSE-SU-2026:5019-1","SUSE-SU-2026:5020-1","SUSE-SU-2026:5034-1","SUSE-SU-2026:5048-1","openSUSE-SU-2026:21910-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68426.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/33e1b0d25ca0d2818c635ff80e6aa0d295e08a98"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3f4c3919baf0944ad96580467c302bc6c7758b00"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4927ab8a8acc8db4fad33e803d1d35e0b16cef83"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4e695742396be18d5291c310a3d7c450959d647a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b58731e0570bfd3989999fc2baf9ee4fecd5bec6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bbca7cc3b2b4b10afbfee99b81d9ee78f5423046"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68426.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68426"},{"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":"f53c723902d1ac5f0b0a11d7c9dcbff748dde74e"},{"fixed":"4e695742396be18d5291c310a3d7c450959d647a"},{"fixed":"4927ab8a8acc8db4fad33e803d1d35e0b16cef83"},{"fixed":"b58731e0570bfd3989999fc2baf9ee4fecd5bec6"},{"fixed":"33e1b0d25ca0d2818c635ff80e6aa0d295e08a98"},{"fixed":"bbca7cc3b2b4b10afbfee99b81d9ee78f5423046"},{"fixed":"3f4c3919baf0944ad96580467c302bc6c7758b00"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68426.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.114"}]},{"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/cve-osv-conversion/osv-output/CVE-2026-68426.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}