Incorrect calculation in Linux kernel - CVE-2026-64235
Published: July 27, 2026
Vulnerability identifier: #VU139771
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-2026-64235
CWE-ID: CWE-682
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 relocation of %rip-relative percpu references in dynamic ftrace trampolines in arch/x86/kernel/ftrace.c when registering a dynamic ftrace trampoline with call depth accounting enabled. A local user can register a crafted tracing configuration and trigger execution of a traced function to cause a denial of service.
Exploitation requires CONFIG_CALL_DEPTH_TRACKING on an x86 retbleed-affected platform with retbleed=stuff enabled.
How to mitigate CVE-2026-64235
Install security update from vendor's repository.