In the Linux kernel, the following vulnerability has been resolved:

cifs: validate idmap key payload length

The cifs.idmap key type stores its payload length in key->datalen, which
is limited to U16_MAX. Accepting a larger key payload truncates the
recorded length and can make later users interpret the payload using
inconsistent bounds.

Reject oversized preparsed payloads before allocating or copying them.
This keeps key->datalen consistent with the stored data for both inline
and separately allocated idmap payloads.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 6cfeef221ac00d63c07f6122f58e6159bde69ca0
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 8b12f65d7caf16d124098cb4895a203367d35b57
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 455488cd5054bcc59db40fa1cc2c004031a5b2a5
0 affected < 6.12.111
0 affected < 6.18.53
Linux Linux affected
Version Status Constraints
6.12.111 unaffected ≤ 6.12.*
6.18.53 unaffected ≤ 6.18.*
7.2 unaffected ≤ *

No data.

No data.

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Fixes

Solution

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Workaround

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References
Link Providers
https://git.kernel.org/stable/c/455488cd5054bcc59db40fa1cc2c004031a5b2a5 cve-icon
https://git.kernel.org/stable/c/6cfeef221ac00d63c07f6122f58e6159bde69ca0 cve-icon
https://git.kernel.org/stable/c/8b12f65d7caf16d124098cb4895a203367d35b57 cve-icon
History

Thu, 24 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: cifs: validate idmap key payload length The cifs.idmap key type stores its payload length in key->datalen, which is limited to U16_MAX. Accepting a larger key payload truncates the recorded length and can make later users interpret the payload using inconsistent bounds. Reject oversized preparsed payloads before allocating or copying them. This keeps key->datalen consistent with the stored data for both inline and separately allocated idmap payloads.
Title cifs: validate idmap key payload length
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-09-24T16:02:18.964Z

Reserved: 2026-09-18T17:59:28.788Z

Link: CVE-2026-93785

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.