CVE-2026-93785: Linux kernel · cifs: validate idmap key payload length
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · 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.
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.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented in the Linux kernel to reject oversized cifs.idmap key payloads before allocation or copying. Users should update to a patched kernel version to remediate this vulnerability.
Description
A vulnerability in the Linux kernel's CIFS module related to the cifs.idmap key type has been resolved. The issue involved improper validation of the payload length, which could lead to inconsistent interpretation of the payload data. The vulnerability was addressed by rejecting oversized payloads before allocation or copying, ensuring the payload length remains consistent with the stored data.
References
- ubuntu.com/security/CVE-2026-93785 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93785 (opens in a new tab)
- git.kernel.org/stable/c/6cfeef221ac00d63c07f6122f58e6159bde69ca0 (opens in a new tab)
- git.kernel.org/stable/c/8b12f65d7caf16d124098cb4895a203367d35b57 (opens in a new tab)
- git.kernel.org/stable/c/455488cd5054bcc59db40fa1cc2c004031a5b2a5 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-93785 (opens in a new tab)
- git.kernel.org/stable/c/125b05ac8ca8758950e4369c1542d57a162f504c (opens in a new tab)
- git.kernel.org/stable/c/3a4a34a732e8a08309eed0a74314dbd9f2f1c972 (opens in a new tab)
- git.kernel.org/stable/c/945f6cde6bcf8f08f6fa5df8882b1b9582e55efa (opens in a new tab)
- git.kernel.org/stable/c/eeac976b74b4f697cfc517187b7cbfd72652dbbc (opens in a new tab)