{"id":"CVE-2026-80928","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-80928","summary":"smack: fix cred UAF in smack_file_send_sigiotask()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmack: fix cred UAF in smack_file_send_sigiotask()\n\nWhen inspecting the credentials of another task, objective credentials\n(->real_cred, accessed with __task_cred()) must always be used.\n\nAccessing ->cred on a non-current task is forbidden unless that task is\nbeing created or destroyed; a task is allowed to change its own ->cred\npointer with no synchronization, and changing ->cred should only affect the\ncurrent syscall.\n\nsmack_file_send_sigiotask() was accessing both sets of credentials: First\ntsk->cred, then __task_cred(tsk).\n\nFix it, always access the objective credentials here.\n\nI have tested that this bug can lead to a KASAN-reported UAF of struct cred\nin smack_file_send_sigiotask(), and that this fix prevents the race.","published":"2026-09-11T19:42:04.044Z","modified":"2026-09-14T03:45:53.079132448Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.12.109"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/b5bcf3adfa27279da4401ab8f1e1a706601a92be"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b791401bf389a1546a830d2b381ca60fe94c7870"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed64aa505875a3b4defd504ee8e59e1949246a62"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fedc88e38ce979a720cd2de042578cb5df3dc8de"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80928.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80928"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-14T03:45:53.079132448Z"}}