CVE-2026-80928High· 7.8▾ TwilightIn 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()) mu…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 7
none → high
— → 7
none → high
— → 7.8
none → high
7.8 → 7
7.8 → 5.5
high → medium
0.2% → 0.2%
Last analysed / modified upstream
5.5 → 7.8
medium → high
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.
Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 < a512366d84e134a9eefc2cc40eeb6e80e2ec162cLinux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 < 7c7fe043f3099d0d35002b248967f75e55345b93Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 < f9c7b1f2b9d8f4176d2632743f51400855978aceLinux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 < b5bcf3adfa27279da4401ab8f1e1a706601a92beLinux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 < ed64aa505875a3b4defd504ee8e59e1949246a62Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 < b791401bf389a1546a830d2b381ca60fe94c7870Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 < fedc88e38ce979a720cd2de042578cb5df3dc8deLinux 2.6.29Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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