SB2026062595 - Use-after-free in Linux kernel md driver
Published: June 25, 2026
Security Bulletin ID
SB2026062595
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-2026-53062)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in the dm-cache smq policy invalidate_mapping operation when handling concurrent writes in passthrough mode. A local user can trigger concurrent cache block invalidations to cause a denial of service.
The issue occurs when the cache is operating in passthrough mode and multiple workers invalidate cache blocks simultaneously.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1b2bec4a7dcf5f00b7a1cbeeec8997841d783513
- https://git.kernel.org/stable/c/2b62d0611c9af14a16bddf22df2612b4f40eb5a1
- https://git.kernel.org/stable/c/2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45
- https://git.kernel.org/stable/c/4991b5a08751e2e82488fb93ae08849b6aea10d9
- https://git.kernel.org/stable/c/93627a29d4b66d4a2def938dfb8610cc80ae454b
- https://git.kernel.org/stable/c/9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e
- https://git.kernel.org/stable/c/ac5ee99443891bdb161f5539606a66a1b5e72542
- https://git.kernel.org/stable/c/c348ae47d8e65f06429fa41adce9ad986b696766