SB20261023128 - Use-after-free in Linux kernel mmc host driver
Published: October 23, 2026
Security Bulletin ID
SB20261023128
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-99035)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to potentially cause a denial of service through a kernel crash.
The vulnerability exists due to use-after-free in the mtk-sd MMC host driver when driver unbinding overlaps with an active request timeout callback. A local privileged user can trigger this overlap to cause the callback to access freed host memory, potentially crashing the kernel.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/46e75703ca3f00fb8c935b3ce35b90836e34e8af
- https://git.kernel.org/stable/c/9e799f25c420e759641eb25102967ea091fc758f
- https://git.kernel.org/stable/c/b38af5386a74416e898955443f2e26547b358cb2
- https://git.kernel.org/stable/c/edef1355224c0799a502a46b71d3649fa0dd218e
- https://git.kernel.org/stable/c/f37e0367ad6f2147a0b37564b442b7a25bec0d23