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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 4e49f997ef0c569e09b42aab6bd38c7c54ea095d, 7be4bd21c50afa83c93799b0f16cf5bfa493194e, c2ab27c2e11591524b1378c24ad18882a425d1fa; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 4e49f997ef0c569e09b42aab6bd38c7c54ea095d, 7be4bd21c50afa83c93799b0f16cf5bfa493194e, c2ab27c2e11591524b1378c24ad18882a425d1fa; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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)

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 9th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

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—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.25affected
    • e114e473771c848c3cfec05f0123e70f1cdbdc99 and later · before 4e49f997ef0c569e09b42aab6bd38c7c54ea095daffected · git
    • e114e473771c848c3cfec05f0123e70f1cdbdc99 and later · before dbece6c2f80b0470d8d99d7a016827dce99ed6e3affected · git
    • e114e473771c848c3cfec05f0123e70f1cdbdc99 and later · before 7be4bd21c50afa83c93799b0f16cf5bfa493194eaffected · git
    • e114e473771c848c3cfec05f0123e70f1cdbdc99 and later · before ec47f4177046dfaaf1cebb15f4d2e7b543475dafaffected · git
    • e114e473771c848c3cfec05f0123e70f1cdbdc99 and later · before e35dc5a4ed6d1e536382d80c685187511ff248a1affected · git
    • e114e473771c848c3cfec05f0123e70f1cdbdc99 and later · before c2ab27c2e11591524b1378c24ad18882a425d1faaffected · git
    • e114e473771c848c3cfec05f0123e70f1cdbdc99 and later · before d02c55e3ea82e41ea2c2026e08201e5daa4d0cfeaffected · git
    • e114e473771c848c3cfec05f0123e70f1cdbdc99 and later · before fba3d32825f4bbc8e20f0cdc3b14df57965b8fe5affected · git
    • before 2.6.25not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-93189Sep 17, 2026 · HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
    35Monitor
  • ← EarlierCVE-2026-93190Sep 17, 2026 · platform/chrome: cros_ec_typec: Reject out-of-bounds PD cap count
    33Monitor
  • Later →CVE-2026-93192Sep 17, 2026 · drm/v3d: Clear queue->active_job when v3d_fence_create() fails
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux4e49f997ef0c569e09b42aab6bd38c7c54ea095dVendor (CNA)
Linux Linux7be4bd21c50afa83c93799b0f16cf5bfa493194eVendor (CNA)
Linux Linuxc2ab27c2e11591524b1378c24ad18882a425d1faVendor (CNA)
Linux Linuxd02c55e3ea82e41ea2c2026e08201e5daa4d0cfeVendor (CNA)
Linux Linuxdbece6c2f80b0470d8d99d7a016827dce99ed6e3Vendor (CNA)
Linux Linuxe35dc5a4ed6d1e536382d80c685187511ff248a1Vendor (CNA)
Linux Linuxec47f4177046dfaaf1cebb15f4d2e7b543475dafVendor (CNA)
Linux Linuxfba3d32825f4bbc8e20f0cdc3b14df57965b8fe5Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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