Out-of-bounds write in Linux kernel - CVE-2026-93201

Vulnerability details

The vulnerability allows a local privileged user to perform out-of-bounds reads and writes.

The vulnerability exists due to an out-of-bounds read and write in dm-pcache cache metadata decoders and workers when processing attacker-controlled cache-device metadata. A local privileged user can supply a cache device containing an out-of-range segment identifier during a table load to perform out-of-bounds reads and writes.

The affected metadata is protected only by a CRC with a fixed public seed.

Affected software

How to mitigate CVE-2026-93201

External References

• https://git.kernel.org/stable/c/90c990a68460d7b5720e5634cf650eccdf0f4098
• https://git.kernel.org/stable/c/b4bf8af5e7d7db4c5e179e15017da55857761ac4

Related Security Bulletins

• Out-of-bounds write in Linux kernel md dm-pcache driver