CVE-2026-93191smack: fix incorrect task context in smack_msg_queue_msgrcv
- —Not scoredno CVSS score yet
- 0.20%Exploitation in 30 daysEPSS · top 91% 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 incorrect task context in smack_msg_queue_msgrcv The smack_msg_queue_msgrcv() function incorrectly checks the permissions of the 'current' task instead of the 'target' task. In the msgsnd() syscall path, if a receiver is already waiting, the pipelined_send() optimization is used to push the message directly to the receiver task: ipc/msg.c`pipelined_send(): ` smp_store_release(&msr->r_msg, msg) In this case, the 'sender' (current) task performs the check on behalf of the 'receiver' task (msr->r_tsk, passed as the 'target' parameter): ipc/msg.c`pipelined_send(): ` security_msg_queue_msgrcv(,, target := msr->r_tsk,,) However, smack_msg_queue_msgrcv() ignores the 'target' and checks 'current': smack_msg_queue_msgrcv(…) ` smk_curacc_msq(isp, MAY_READWRITE); // current task 'current' MAY satisfy smack_msg_queue_msgrcv r/w requirement, but 'target' (the receiver task) might NOT; as a result, an unauthorized receiver gets the message, violating MAC policy. Test: 1) create a sysv message queue with label “foo” 2) echo "bar foo r" >/smack/load2 3) msgrcv(,,,0,MSG_NOERROR) in "bar"-labeled task. The task is waiting for the messages ... 4) msgsnd() from a "foo"-labeled task: "bar"-labeled task gets the message. This patch fixes the issue by checking permission on the 'target' task instead of 'current'. (2008-02-04, Casey Schaufler)
Timeline
ID reserved
By Linux
Published
- 32 days later
· 32 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.20% · top 91% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < 4e49f997ef0c569e09b42aab6bd38c7c54ea095d
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < dbece6c2f80b0470d8d99d7a016827dce99ed6e3
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < 7be4bd21c50afa83c93799b0f16cf5bfa493194e
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < ec47f4177046dfaaf1cebb15f4d2e7b543475daf
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < e35dc5a4ed6d1e536382d80c685187511ff248a1
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < c2ab27c2e11591524b1378c24ad18882a425d1fa
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < d02c55e3ea82e41ea2c2026e08201e5daa4d0cfe
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < fba3d32825f4bbc8e20f0cdc3b14df57965b8fe5
- affected 2.6.25
- unaffected < 2.6.25
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/4e49f997ef0c569e09b42aab6bd38c7c54ea095d (opens in a new tab)
- https://git.kernel.org/stable/c/dbece6c2f80b0470d8d99d7a016827dce99ed6e3 (opens in a new tab)
- https://git.kernel.org/stable/c/7be4bd21c50afa83c93799b0f16cf5bfa493194e (opens in a new tab)
- https://git.kernel.org/stable/c/ec47f4177046dfaaf1cebb15f4d2e7b543475daf (opens in a new tab)
- https://git.kernel.org/stable/c/e35dc5a4ed6d1e536382d80c685187511ff248a1 (opens in a new tab)
- https://git.kernel.org/stable/c/c2ab27c2e11591524b1378c24ad18882a425d1fa (opens in a new tab)
- https://git.kernel.org/stable/c/d02c55e3ea82e41ea2c2026e08201e5daa4d0cfe (opens in a new tab)
- https://git.kernel.org/stable/c/fba3d32825f4bbc8e20f0cdc3b14df57965b8fe5 (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-2026-82299 (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-2026-93191)Record last updated .