CVE-2026-93785

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.

References

• https://git.kernel.org/stable/c/455488cd5054bcc59db40fa1cc2c004031a5b2a5
• https://git.kernel.org/stable/c/6cfeef221ac00d63c07f6122f58e6159bde69ca0
• https://git.kernel.org/stable/c/8b12f65d7caf16d124098cb4895a203367d35b57