Unknown

CVE-2026-93191 — smack: fix incorrect task context in smack_msg_queue_msgrcv

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)

Published Sep 17, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.2%

ahead of 9% of scored CVEs · Oct 15, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ e114e473771c848c3cfec05f0123e70f1cdbdc99 and < 4e49f997ef0c569e09b42aab6bd38c7c54ea095d≥ e114e473771c848c3cfec05f0123e70f1cdbdc99 and < dbece6c2f80b0470d8d99d7a016827dce99ed6e3≥ e114e473771c848c3cfec05f0123e70f1cdbdc99 and < 7be4bd21c50afa83c93799b0f16cf5bfa493194e≥ e114e473771c848c3cfec05f0123e70f1cdbdc99 and < ec47f4177046dfaaf1cebb15f4d2e7b543475daf≥ e114e473771c848c3cfec05f0123e70f1cdbdc99 and < e35dc5a4ed6d1e536382d80c685187511ff248a1≥ e114e473771c848c3cfec05f0123e70f1cdbdc99 and < c2ab27c2e11591524b1378c24ad18882a425d1fa≥ e114e473771c848c3cfec05f0123e70f1cdbdc99 and < d02c55e3ea82e41ea2c2026e08201e5daa4d0cfe≥ e114e473771c848c3cfec05f0123e70f1cdbdc99 and < fba3d32825f4bbc8e20f0cdc3b14df57965b8fe5 and 1 more version 2.6.25	Vulnerable	CVE Program (cve.org) e CISA ADP

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 17, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/c2ab27c2e11591524b1378c24ad18882a425d1fa
NIST National Vulnerability Database
git.kernel.org/stable/c/4e49f997ef0c569e09b42aab6bd38c7c54ea095d
NIST National Vulnerability Database
git.kernel.org/stable/c/dbece6c2f80b0470d8d99d7a016827dce99ed6e3
NIST National Vulnerability Database
git.kernel.org/stable/c/d02c55e3ea82e41ea2c2026e08201e5daa4d0cfe
NIST National Vulnerability Database
git.kernel.org/stable/c/e35dc5a4ed6d1e536382d80c685187511ff248a1
NIST National Vulnerability Database
git.kernel.org/stable/c/7be4bd21c50afa83c93799b0f16cf5bfa493194e
NIST National Vulnerability Database
git.kernel.org/stable/c/ec47f4177046dfaaf1cebb15f4d2e7b543475daf
NIST National Vulnerability Database
git.kernel.org/stable/c/fba3d32825f4bbc8e20f0cdc3b14df57965b8fe5
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 1d
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 1d
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 2d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 2d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 2d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-93191 is "smack: fix incorrect task context in smack_msg_queue_msgrcv", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.20% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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