VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90169: Linux kernel · ksmbd: free preauth sessions on connection teardown

Source GCVE Database

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Authoritative record:CVE-2026-90169· Medium

Not known to be exploited · fixed in effcf48d79d8aa53113d8289e140746f25ceb62c : update Linux kernel when convenient.

Data as of 30 Oct 2026, 19:03 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 effcf48d79d8aa53113d8289e140746f25ceb62c, b62b1ebb25f0a19067ed5b1a86036b2dc98be44f, a41a98ee16ae038751b6639decadaa3ce15ca18a +3

Exploitation evidence

Disclosed: evidence found.
CVE published 17 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-p3rj-65j3-jpxc

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < effcf48d79d8aa53113d8289e140746f25ceb62c	Fixed in effcf48d79d8aa53113d8289e140746f25ceb62c
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < b62b1ebb25f0a19067ed5b1a86036b2dc98be44f	Fixed in b62b1ebb25f0a19067ed5b1a86036b2dc98be44f
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < a41a98ee16ae038751b6639decadaa3ce15ca18a	Fixed in a41a98ee16ae038751b6639decadaa3ce15ca18a
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 8e2ebc77678832e981adc008d25cd8f67d08ebc4	Fixed in 8e2ebc77678832e981adc008d25cd8f67d08ebc4
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 06c7b1d731bc105a8644f1b70165ba8b9416cbab	Fixed in 06c7b1d731bc105a8644f1b70165ba8b9416cbab
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 1f60a88b2e0203e50f65b0fb9c32ecb0ae0aa683	Fixed in 1f60a88b2e0203e50f65b0fb9c32ecb0ae0aa683

AI-suggested

A fix has been implemented in the Linux kernel to release preauthentication sessions on connection teardown and to initialize the session list safely. Users should update to the fixed kernel version once available. No other mitigation steps are indicated.

Description

A use-after-free vulnerability in the Linux kernel's ksmbd SMB3.1.1 multichannel binding implementation was fixed. The flaw involved preauthentication session objects not being freed if a client disconnected after the NTLM negotiate request but before the authenticate request, potentially leading to resource leaks.

References

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