Use-after-free in Linux kernel - CVE-2026-98213

Vulnerability details

The vulnerability allows a local user to cause a use-after-free access to kernel memory.

The vulnerability exists due to use-after-free in the MMC core SDIO interrupt worker when pending interrupt work executes after the host controller is removed and its host structure is freed. A local user can trigger execution of the pending worker during this removal race to cause a use-after-free access to kernel memory.

The issue applies to host controllers that use sdio_signal_irq() to schedule SDIO interrupt work from their interrupt handlers.

Affected software

How to mitigate CVE-2026-98213

External References

• https://git.kernel.org/stable/c/0bf3d168a2cc20b120d6b50f0a8ac5b40ff4d589
• https://git.kernel.org/stable/c/1d6e7315ee1c992b4ca42c9b11c5ed0e925a00e0
• https://git.kernel.org/stable/c/2a863458828ade0671c2bc2e469bbd7f2340eb03
• https://git.kernel.org/stable/c/4553b5004eca9c9eae29a421f1a9c4d5db2c9114
• https://git.kernel.org/stable/c/6feadbecdae60a6324c967f3b1493741083793a3
• https://git.kernel.org/stable/c/bae1cf4f9902b2065bd78b759c7fe6312855f05e

Related Security Bulletins

• Use-after-free in Linux kernel mmc core driver
• Debian update for linux