Out-of-bounds write in Linux kernel - CVE-2026-98566

Vulnerability details

The vulnerability allows a local user to potentially corrupt kernel memory or cause a denial of service.

The vulnerability exists due to missing array bounds checks in the Linux kernel's pvr_free_list_process_reconstruct_req() function when processing firmware freelist reconstruction requests. A local user can potentially trigger processing of an oversized freelist count to cause out-of-bounds reads from the fixed request array and out-of-bounds writes to the fixed response array, potentially corrupting kernel memory or causing a denial of service.

Affected software

How to mitigate CVE-2026-98566

External References

• https://git.kernel.org/stable/c/45585c3aa285854face65293acc95eff73063d6d
• https://git.kernel.org/stable/c/b78f8f5532a077baa4aabccf657a4fb3b164659e
• https://git.kernel.org/stable/c/e0560db0ea6e10c283ebe7c259a7af8d3b6e61a6
• https://git.kernel.org/stable/c/eabd0ae3611769c826dbc118a1e240628731b348

Related Security Bulletins

• Out-of-bounds write in Linux kernel drm imagination driver