CVE-2026-80928smack: fix cred UAF in smack_file_send_sigiotask()
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 – < a512366d84e134a9eefc2cc40eeb6e80e2ec162c
- affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 – < 7c7fe043f3099d0d35002b248967f75e55345b93
- affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 – < f9c7b1f2b9d8f4176d2632743f51400855978ace
- affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 – < b5bcf3adfa27279da4401ab8f1e1a706601a92be
- affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 – < ed64aa505875a3b4defd504ee8e59e1949246a62
- affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 – < b791401bf389a1546a830d2b381ca60fe94c7870
- affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 – < fedc88e38ce979a720cd2de042578cb5df3dc8de
- affected 2.6.29
- unaffected < 2.6.29
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References7
- https://git.kernel.org/stable/c/a512366d84e134a9eefc2cc40eeb6e80e2ec162c (opens in a new tab)
- https://git.kernel.org/stable/c/7c7fe043f3099d0d35002b248967f75e55345b93 (opens in a new tab)
- https://git.kernel.org/stable/c/f9c7b1f2b9d8f4176d2632743f51400855978ace (opens in a new tab)
- https://git.kernel.org/stable/c/b5bcf3adfa27279da4401ab8f1e1a706601a92be (opens in a new tab)
- https://git.kernel.org/stable/c/ed64aa505875a3b4defd504ee8e59e1949246a62 (opens in a new tab)
- https://git.kernel.org/stable/c/b791401bf389a1546a830d2b381ca60fe94c7870 (opens in a new tab)
- https://git.kernel.org/stable/c/fedc88e38ce979a720cd2de042578cb5df3dc8de (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76251 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80928)Record last updated .