{"id":"CVE-2026-45966","summary":"apparmor: fix NULL pointer dereference in __unix_needs_revalidation","details":"In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix NULL pointer dereference in __unix_needs_revalidation\n\nWhen receiving file descriptors via SCM_RIGHTS, both the socket pointer\nand the socket's sk pointer can be NULL during socket setup or teardown,\ncausing NULL pointer dereferences in __unix_needs_revalidation().\n\nThis is a regression in AppArmor 5.0.0 (kernel 6.17+) where the new\n__unix_needs_revalidation() function was added without proper NULL checks.\n\nThe crash manifests as:\n  BUG: kernel NULL pointer dereference, address: 0x0000000000000018\n  RIP: aa_file_perm+0xb7/0x3b0 (or +0xbe/0x3b0, +0xc0/0x3e0)\n  Call Trace:\n   apparmor_file_receive+0x42/0x80\n   security_file_receive+0x2e/0x50\n   receive_fd+0x1d/0xf0\n   scm_detach_fds+0xad/0x1c0\n\nThe function dereferences sock-\u003esk-\u003esk_family without checking if either\nsock or sock-\u003esk is NULL first.\n\nAdd NULL checks for both sock and sock-\u003esk before accessing sk_family.","modified":"2026-05-29T04:03:08.874681359Z","published":"2026-05-27T12:18:24.300Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45966.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/e2938ad00b21340c0362562dfedd7cfec0554d67"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e85bc9101afc4202aa2269967ce9d3ffbecd0994"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fea017a7f6abe179decf575a2d8464c74edb3964"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45966.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45966"},{"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":"88fec3526e84123997ecebd6bb6778eb4ce779b7"},{"fixed":"fea017a7f6abe179decf575a2d8464c74edb3964"},{"fixed":"e85bc9101afc4202aa2269967ce9d3ffbecd0994"},{"fixed":"e2938ad00b21340c0362562dfedd7cfec0554d67"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-45966.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.17.0"},{"fixed":"6.18.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-45966.json"}}],"schema_version":"1.7.5"}