VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

CVE-2026-90154: Linux kernel · ksmbd: scope session state changes to bound connections

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in c50e628122aed077695669e25b842e778511a43d : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c50e628122aed077695669e25b842e778511a43d, 0875872718b98e8530fbc634e5aa7dbd3253b80d, 3deefd5fb1368e2577144b0961b1a5df26b587d1 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < c50e628122aed077695669e25b842e778511a43d	Fixed in c50e628122aed077695669e25b842e778511a43d
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 0875872718b98e8530fbc634e5aa7dbd3253b80d	Fixed in 0875872718b98e8530fbc634e5aa7dbd3253b80d
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 3deefd5fb1368e2577144b0961b1a5df26b587d1	Fixed in 3deefd5fb1368e2577144b0961b1a5df26b587d1
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 3d66f3ec3c69fa242939a9f9e6815df33390b1bb	Fixed in 3d66f3ec3c69fa242939a9f9e6815df33390b1bb
LinuxLinux	Affected ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 1ff0e41afbe73240a7d7b96d4e8e86d0aaf0fe0b	Fixed in 1ff0e41afbe73240a7d7b96d4e8e86d0aaf0fe0b
LinuxLinux	Affected =5.15	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: scope session state changes to bound connections ksmbd_all_conn_set_status() treats every connection whose transient binding flag is set as belonging to the target SessionId. A logoff or session replacement can consequently move an unrelated connection to NEED_RECONNECT or NEED_SETUP. Pass the target session itself and select connections using either the connection-local session xarray or the session's permanent channel list. Use the same association test while waiting for requests to drain. Serialize session-wide status changes under request_lock and do not overwrite EXITING or RELEASING. Protect the shutdown transition with the same lock so a concurrent session update cannot revive a closing connection.

References

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