SB20260720394 - Operation on a Resource after Expiration or Release in Linux kernel include asm
Published: July 20, 2026
Security Bulletin ID
SB20260720394
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) Operation on a Resource after Expiration or Release (CVE-ID: CVE-2026-63875)
CWE-ID: CWE-672 - Operation on a Resource after Expiration or Release
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper cache invalidation in arm64 TLB flushing logic when unsharing PMD tables. A local user can trigger PMD table unsharing to cause a denial of service.
The issue can leave a stale PMD page table entry in the walk cache, which may result in incorrect page table walks.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0199c9d57861f17b556b6cba1f765c7cce79745b
- https://git.kernel.org/stable/c/47490bbb05c8c0e09cc3cfd237d8934ffc340583
- https://git.kernel.org/stable/c/48125cd9c55cbe297b59fd1f9bda48b0960bd181
- https://git.kernel.org/stable/c/8ca7284da0e67b3e71d90ec17f08286774245ad9
- https://git.kernel.org/stable/c/c2ff4764e03e7a8d758352f4aceb8fe1be6ac971
- https://git.kernel.org/stable/c/d766a49d9b55705c4737cd8bb5d3faa2d31330fd
- https://git.kernel.org/stable/c/dced308d7d6a0de1c09d2058f38f1aaaf5cbb914
- https://git.kernel.org/stable/c/fe93e907b1af03cc229a80aa64a570a103d2b279