SB20260816450 - Use-after-free in Linux kernel mmc host driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-72073)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 use-after-free.

The vulnerability exists due to use-after-free in the vub300_probe error path in drivers/mmc/host/vub300.c when handling a failed mmc_add_host() call after the inactivity timer has been armed. A local user can trigger a probe failure race to cause a use-after-free.

Exploitation requires a failure during device probe after the inactivity timer is armed, and the queued deadwork may continue running after the timer callback has completed.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5b82af744e06cd741938c3da54fdbe564a7e52d9
• https://git.kernel.org/stable/c/618cf6b139503ec18ef93ffd663396aaf99b763a
• https://git.kernel.org/stable/c/a3b5f242997a3be7404112fd48784881560aea57