VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in d2ccf905f47d2344270749f4dfa905afcd3edeb0 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:30 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 d2ccf905f47d2344270749f4dfa905afcd3edeb0, 8461f27902727ad434375caf13a0100aafc0340f, 7065d3648b1a48d2c49da3d6364dd3c4d503b10c +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 ≥ 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
LinuxLinux	Affected =5.15	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: smb/server: fix null-ptr-deref in ksmbd_ipc_tree_connect_request() See the procedure below: ksmbd_tree_conn_connect ksmbd_share_config_get share->name = kstrdup() // fail if (!test_share_config_flag(share, KSMBD_SHARE_FLAG_PIPE)) // false // do not check `share->name` ksmbd_ipc_tree_connect_request strlen(share->name) // null-ptr-deref

References

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