VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90166: Linux kernel · smb/server: fix null-ptr-deref in ksmbd_ipc_tree_connect_request()

Source GCVE Database

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Authoritative record:CVE-2026-90166· Medium

Not known to be exploited · fixed in d601be98c9445894c759c28d4a7a52151387f1fb : update Linux kernel when convenient.

Data as of 30 Oct 2026, 19:05 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 d601be98c9445894c759c28d4a7a52151387f1fb, d2ccf905f47d2344270749f4dfa905afcd3edeb0, 8461f27902727ad434375caf13a0100aafc0340f +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-72gq-5j57-9667

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < d601be98c9445894c759c28d4a7a52151387f1fb	Fixed in d601be98c9445894c759c28d4a7a52151387f1fb
LinuxLinux	Affected ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < d2ccf905f47d2344270749f4dfa905afcd3edeb0	Fixed in d2ccf905f47d2344270749f4dfa905afcd3edeb0
LinuxLinux	Affected ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 8461f27902727ad434375caf13a0100aafc0340f	Fixed in 8461f27902727ad434375caf13a0100aafc0340f
LinuxLinux	Affected ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 7065d3648b1a48d2c49da3d6364dd3c4d503b10c	Fixed in 7065d3648b1a48d2c49da3d6364dd3c4d503b10c
LinuxLinux	Affected ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 5ffd180307a5ea34dae7f90ff9573ebed6b7fb12	Fixed in 5ffd180307a5ea34dae7f90ff9573ebed6b7fb12
LinuxLinux	Affected ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 4eb74a34ea401abfbbd5991076715dae3de938df	Fixed in 4eb74a34ea401abfbbd5991076715dae3de938df

AI-suggested

A fix has been implemented in the Linux kernel to address this null pointer dereference. Users should apply the official kernel updates containing this fix once available. Since this is a kernel-level issue, updating to a patched kernel version is the recommended remediation.

Description

A null pointer dereference vulnerability was identified and fixed in the Linux kernel's SMB server component, specifically in the function ksmbd_ipc_tree_connect_request(). The flaw occurs when the share name pointer is not properly checked for null after a failed memory allocation, leading to a potential null pointer dereference during string length calculation.

References

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