VulnerabilityPublished 7 Nov 2026

CVE-2026-99276: Linux kernel · ksmbd: defer connection scavenging while session locks are busy

Source GCVE Database

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Authoritative record:CVE-2026-99276· Medium

Not known to be exploited · fixed in b4bae7af1154089be87c7475218264fcbfd16d10 : update Linux kernel when convenient.

Data as of 7 Nov 2026, 16:17 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 b4bae7af1154089be87c7475218264fcbfd16d10, 7.3, 4e4e8b38994a0b0fc23f00ca6698b469a41abe70

Exploitation evidence

Disclosed: evidence found.
CVE published 7 Nov 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 7 Nov 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-cj33-3vqp-rcq7

What to do

Upgrade Linux kernel to b4bae7af1154089be87c7475218264fcbfd16d10, 7.3 or 4e4e8b38994a0b0fc23f00ca6698b469a41abe70.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=7.2.8 <7.3	Fixed in b4bae7af1154089be87c7475218264fcbfd16d10 7.3 4e4e8b38994a0b0fc23f00ca6698b469a41abe70
LinuxLinux	Affected =7.3	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to defer connection scavenging when session locks are busy, preventing the deadlock condition. Users should apply the official kernel updates that include this fix once available. No additional mitigations are indicated.

Description

CVE-2026-99276 is a vulnerability in the Linux kernel's ksmbd component related to connection scavenging and session lock handling. The flaw involves a potential deadlock scenario where the expiration worker holds a read lock while waiting for session locks that are held by a writer queued on the same lock, causing a circular wait. The fix defers connection scavenging when session locks are busy, allowing the worker to retry later instead of blocking.

References

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