Observable discrepancy in Linux kernel - CVE-2026-64507
Published: July 27, 2026
Vulnerability identifier: #VU139433
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64507
CWE-ID: CWE-203
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to improper protection against speculative execution in BPF JIT memory reuse on x86 systems when reusing JIT-compiled BPF memory under Spectre-v2 conditions. A local user can trigger BPF JIT allocation reuse to disclose sensitive information.
Only systems with BPF-JIT enabled are affected.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-64507
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.100-1
linux (Debian package) - update to 6.12.100-1
External References
- https://git.kernel.org/stable/c/52440e15d9628f8f239373c0f2e5e8f92feea2df
- https://git.kernel.org/stable/c/8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1
- https://git.kernel.org/stable/c/9354248fc1c33a844ca1872761f6668b393e8c37
- https://git.kernel.org/stable/c/a3af84b0fa00ead01fcd0e28b5d773ff25990a0d
- https://git.kernel.org/stable/c/cb27f3bf915cc0f20fc0c48da9059304e39ebd35