Use-after-free in Linux kernel - CVE-2026-74574

Vulnerability details

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

The vulnerability exists due to a deadlock and use-after-free in idxd_cdev_open() when handling file-device setup failures. A local user can trigger a failure during device open processing to cause a denial of service.

The issue occurs in error-handling paths that can release the last file-device reference while the workqueue lock is still held.

Affected software

How to mitigate CVE-2026-74574

External References

• https://git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7
• https://git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55
• https://git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e
• https://git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7
• https://git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066

Related Security Bulletins

• Use-after-free in Linux kernel dma idxd driver
• Debian update for linux