CVE-2026-80928smack: fix cred UAF in smack_file_send_sigiotask()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: smack: fix cred UAF in smack_file_send_sigiotask() When inspecting the credentials of another task, objective credentials (->real_cred, accessed with __task_cred()) must always be used. Accessing ->cred on a non-current task is forbidden unless that task is being created or destroyed; a task is allowed to change its own ->cred pointer with no synchronization, and changing ->cred should only affect the current syscall. smack_file_send_sigiotask() was accessing both sets of credentials: First tsk->cred, then __task_cred(tsk). Fix it, always access the objective credentials here. I have tested that this bug can lead to a KASAN-reported UAF of struct cred in smack_file_send_sigiotask(), and that this fix prevents the race.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 3b11a1decef07c19443d24ae926982bc8ec9f4c0 before a512366d84e134a9eefc2cc40eeb6e80e2ec162c; from 3b11a1decef07c19443d24ae926982bc8ec9f4c0 before 7c7fe043f3099d0d35002b248967f75e55345b93; from 3b11a1decef07c19443d24ae926982bc8ec9f4c0 before f9c7b1f2b9d8f4176d2632743f51400855978ace; from 3b11a1decef07c19443d24ae926982bc8ec9f4c0 before b5bcf3adfa27279da4401ab8f1e1a706601a92be; from 3b11a1decef07c19443d24ae926982bc8ec9f4c0 before ed64aa505875a3b4defd504ee8e59e1949246a62; from 3b11a1decef07c19443d24ae926982bc8ec9f4c0 before b791401bf389a1546a830d2b381ca60fe94c7870; from 3b11a1decef07c19443d24ae926982bc8ec9f4c0 before fedc88e38ce979a720cd2de042578cb5df3dc8de | CNA record |
References
- https://git.kernel.org/stable/c/a512366d84e134a9eefc2cc40eeb6e80e2ec162c
- https://git.kernel.org/stable/c/7c7fe043f3099d0d35002b248967f75e55345b93
- https://git.kernel.org/stable/c/f9c7b1f2b9d8f4176d2632743f51400855978ace
- https://git.kernel.org/stable/c/b5bcf3adfa27279da4401ab8f1e1a706601a92be
- https://git.kernel.org/stable/c/ed64aa505875a3b4defd504ee8e59e1949246a62
- https://git.kernel.org/stable/c/b791401bf389a1546a830d2b381ca60fe94c7870
- https://git.kernel.org/stable/c/fedc88e38ce979a720cd2de042578cb5df3dc8de
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.