SB2026082866 - Double free in Linux kernel dma idxd driver

Description

This security bulletin contains information about 1 vulnerability.

1) Double free (CVE-ID: CVE-2026-80698)

CWE-ID: CWE-415 - Double Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a double free in the idxd wq, engine, and group device setup and cleanup paths when handling device reference release during error handling and cleanup. A local user can trigger affected cleanup paths to cause a denial of service.

The issue occurs when put_device() drops the device reference count to zero and invokes the release callbacks, while the same allocations are also freed explicitly.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/c93a9f652b7373ac8ee5bfcc18a9af76959b6c6c
• https://git.kernel.org/stable/c/ec2d428b2e32dd157de8f86a86dd85c5b2c8f45c