VulnerabilityPublished 24 Sep 2026Updated 19 Oct 2026

CVE-2026-93210: Linux kernel · smb: client: harden DFS cache against invalid target hints

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in bf86c08123c6ab8c61cc0be1dad7540db93738ff : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in bf86c08123c6ab8c61cc0be1dad7540db93738ff, a48328afbc3f63e3b9de8827e2e16c15b17976f7, 846f0709559b9e27024e126a80bc7afb76516912 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 24 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 ≥ 54be1f6c1c37498bba557049df646cc239fa37e3, < bf86c08123c6ab8c61cc0be1dad7540db93738ff	Fixed in bf86c08123c6ab8c61cc0be1dad7540db93738ff
LinuxLinux	Affected ≥ 54be1f6c1c37498bba557049df646cc239fa37e3, < a48328afbc3f63e3b9de8827e2e16c15b17976f7	Fixed in a48328afbc3f63e3b9de8827e2e16c15b17976f7
LinuxLinux	Affected ≥ 54be1f6c1c37498bba557049df646cc239fa37e3, < 846f0709559b9e27024e126a80bc7afb76516912	Fixed in 846f0709559b9e27024e126a80bc7afb76516912
LinuxLinux	Affected ≥ 54be1f6c1c37498bba557049df646cc239fa37e3, < 66dbcdbb0cadffd12eb8f2b115fd57d384c5109d	Fixed in 66dbcdbb0cadffd12eb8f2b115fd57d384c5109d
LinuxLinux	Affected ≥ 54be1f6c1c37498bba557049df646cc239fa37e3, < 7e32da6047d9afdae8dd17b87b4c8d97363c4ee2	Fixed in 7e32da6047d9afdae8dd17b87b4c8d97363c4ee2
LinuxLinux	Affected ≥ 54be1f6c1c37498bba557049df646cc239fa37e3, < 6cb7f9fed8f40f28fbd464ca99c946951afc0952	Fixed in 6cb7f9fed8f40f28fbd464ca99c946951afc0952

AI-suggested

A fix has been implemented in the Linux kernel as indicated by multiple fixed commit versions. Users should update to a Linux kernel version that includes these fixes to remediate the vulnerability.

Description

A vulnerability in the Linux kernel SMB client related to the DFS cache handling has been resolved. The issue involved improper handling of invalid target hints, where certain functions assumed the presence of valid pointers and did not handle error or null pointer cases correctly. This could lead to potential stability or security issues in the SMB client implementation.

Impact

The vulnerability could cause null pointer dereferences in the SMB client DFS cache code, potentially leading to kernel instability or denial of service conditions. No evidence of exploitation in the wild is known, and no direct impact such as privilege escalation or data corruption is described.

Summary

CVE-2026-93210 addresses a flaw in the Linux kernel's SMB client DFS cache management. Specifically, get_tgt_name() returns an error pointer when the target hint is NULL, but dfs_cache_noreq_update_tgthint() assumed the target hint was always valid, risking null pointer dereferences. The fix hardens callers of get_tgt_name() to handle error pointers properly and protects dfs_cache_noreq_update_tgthint() against null pointer dereferences, improving robustness in DFS cache handling.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 14:02 UTC

Technical details

References

Community reviews

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