CVE-2026-93785

cifs: validate idmap key payload length

N/A

Published: September 24, 2026 at 04:02 PM UTC

Updated: October 3, 2026 at 11:17 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

N/A

Exploit prediction

EPSS 0.2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

3.2 ≤ v < 5.10.2713.2 ≤ v < 5.15.2223.2 ≤ v < 6.1.1893.2 ≤ v < 6.12.1113.2 ≤ v < 6.18.533.2 ≤ v < 6.6.1583.2 ≤ v < 7.221fed0d5b763b94a7d1568c27d0cce892ab8d43e3.2

Vendor states this is fixed in 125b05ac8ca8758950e4369c1542d57a162f504c (fixed)

Vendor states this is fixed in 3a4a34a732e8a08309eed0a74314dbd9f2f1c972 (fixed)

Vendor states this is fixed in 455488cd5054bcc59db40fa1cc2c004031a5b2a5 (fixed)

Vendor states this is fixed in 6cfeef221ac00d63c07f6122f58e6159bde69ca0 (fixed)

Vendor states this is fixed in 8b12f65d7caf16d124098cb4895a203367d35b57 (fixed)

Vendor states this is fixed in 945f6cde6bcf8f08f6fa5df8882b1b9582e55efa (fixed)

Vendor states this is fixed in eeac976b74b4f697cfc517187b7cbfd72652dbbc (fixed)

Vendor states this is fixed in 3.2 (unaffected)

Vendor states this is fixed in 5.10.271 (unaffected)

Vendor states this is fixed in 5.15.222 (unaffected)

Vendor states this is fixed in 6.1.189 (unaffected)

Vendor states this is fixed in 6.12.111 (unaffected)