SB20260912345 - Use-after-free in Linux kernel mmc host driver
Published: September 12, 2026
Security Bulletin ID
SB20260912345
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-2026-89440)
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 denial of service.
The vulnerability exists due to use-after-free in the via-sdmmc card-detect interrupt handler and carddet_work when handling a card-detect interrupt after mmc_add_host() fails. A local user can trigger card-detect interrupt handling against a freed host object to cause a denial of service.
Remediation
Install update from vendor's website.