What’s Vulnerable › Vulnerabilities

CVE-2026-93785: cifs: validate idmap key payload length

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-10-03

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 products

• Linux kernel: 3.2 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/125b05ac8ca8758950e4369c1542d57a162f504c
• https://git.kernel.org/stable/c/3a4a34a732e8a08309eed0a74314dbd9f2f1c972
• https://git.kernel.org/stable/c/455488cd5054bcc59db40fa1cc2c004031a5b2a5
• https://git.kernel.org/stable/c/6cfeef221ac00d63c07f6122f58e6159bde69ca0
• https://git.kernel.org/stable/c/8b12f65d7caf16d124098cb4895a203367d35b57
• https://git.kernel.org/stable/c/945f6cde6bcf8f08f6fa5df8882b1b9582e55efa
• https://git.kernel.org/stable/c/eeac976b74b4f697cfc517187b7cbfd72652dbbc

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