Operation on a Resource after Expiration or Release in Linux kernel - CVE-2026-63875
Published: July 20, 2026
Vulnerability identifier: #VU138775
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-63875
CWE-ID: CWE-672
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-63875
Install security update from vendor's repository.
Sources
- 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