VulnerabilityPublished 24 Sep 2026Updated 30 Oct 2026

CVE-2026-93829: Linux kernel · smb: client: fix races in cifsd thread creation

Source GCVE Database

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Authoritative record:CVE-2026-93829· Medium

Not known to be exploited · fixed in ee8f811cbac56ffb738b3a73671a9e75b0f56e99 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 17:52 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in ee8f811cbac56ffb738b3a73671a9e75b0f56e99, e8a5cf2ff5a13fefb228f2069e29dd7d8e37185d, cfa09f63e75cf440c9be97d1e73d509bfbb2c2c5 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-v43p-8x6p-65w4

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ aaf737adb6937339494d5a7111f0433cd9676db8, < ee8f811cbac56ffb738b3a73671a9e75b0f56e99	Fixed in ee8f811cbac56ffb738b3a73671a9e75b0f56e99
LinuxLinux	Affected ≥ aaf737adb6937339494d5a7111f0433cd9676db8, < e8a5cf2ff5a13fefb228f2069e29dd7d8e37185d	Fixed in e8a5cf2ff5a13fefb228f2069e29dd7d8e37185d
LinuxLinux	Affected ≥ aaf737adb6937339494d5a7111f0433cd9676db8, < cfa09f63e75cf440c9be97d1e73d509bfbb2c2c5	Fixed in cfa09f63e75cf440c9be97d1e73d509bfbb2c2c5
LinuxLinux	Affected ≥ aaf737adb6937339494d5a7111f0433cd9676db8, < 2376fb3348b4fa72a5158c8a63ff2489e1956541	Fixed in 2376fb3348b4fa72a5158c8a63ff2489e1956541
LinuxLinux	Affected ≥ aaf737adb6937339494d5a7111f0433cd9676db8, < 0eee1e6cddd1d9ce14da06e0238ca8d3362dec90	Fixed in 0eee1e6cddd1d9ce14da06e0238ca8d3362dec90
LinuxLinux	Affected =2.6.22	Fixed in–

AI-suggested

A fix for this vulnerability has been implemented in the Linux kernel by changing the thread creation sequence to ensure tcp_ses is fully populated before the thread starts. Users should apply the official kernel updates that include this fix once available.

Description

A race condition vulnerability in the Linux kernel's SMB client (cifsd) thread creation was fixed. The issue involved the cifsd demultiplex thread accessing uninitialized tcp_ses fields and potential thread pointer races causing the thread to sleep indefinitely. The fix ensures the thread is created only after tcp_ses is fully populated, preventing these race conditions.

References

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