Race condition in Linux kernel - CVE-2026-64375

Vulnerability identifier: #VU139595

CSH Severity: Low

CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64375

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to a race condition in proc_pid_get_link() and proc_pid_readlink() when handling access to /proc pid link targets. A local user can trigger concurrent task state changes to disclose sensitive information.

The issue affects file descriptor-related proc links and involves ptrace_may_access() checks performed on a different task lookup than the one used for the actual access.

Linux kernel
Debian Linux
openEuler
Ubuntu
kernel
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel-source
linux (Debian package)
linux (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 5.10.0-328.0.0.229
python3-perf-debuginfo - update to 5.10.0-328.0.0.229
python3-perf - update to 5.10.0-328.0.0.229
perf-debuginfo - update to 5.10.0-328.0.0.229
perf - update to 5.10.0-328.0.0.229
kernel-tools-devel - update to 5.10.0-328.0.0.229
kernel-tools-debuginfo - update to 5.10.0-328.0.0.229
kernel-tools - update to 5.10.0-328.0.0.229
kernel-headers - update to 5.10.0-328.0.0.229
kernel-devel - update to 5.10.0-328.0.0.229
kernel-debugsource - update to 5.10.0-328.0.0.229
kernel-debuginfo - update to 5.10.0-328.0.0.229
bpftool-debuginfo - update to 5.10.0-328.0.0.229
bpftool - update to 5.10.0-328.0.0.229
kernel-source - update to 5.10.0-328.0.0.229
linux (Debian package) - update to 6.12.100-1
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13

• https://git.kernel.org/stable/c/138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2
• https://git.kernel.org/stable/c/497c6bae5167428596575f20af6613ff5671f383
• https://git.kernel.org/stable/c/6253dfee5afba536bb54fc6fe6c091c3758fafe1
• https://git.kernel.org/stable/c/6255da28d4bb5349fe18e84cb043ccd394eba75d
• https://git.kernel.org/stable/c/65bf0d2b6e914f1448d6a2fde193dcf60936a651
• https://git.kernel.org/stable/c/83b17872e3166c295c599279fc9562ac3840c638
• https://git.kernel.org/stable/c/de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf
• https://git.kernel.org/stable/c/dfd1894cb64cbd8758b461ed713800fe73db4f82

• Race condition in Linux kernel proc
• Debian update for linux
• openEuler 22.03 LTS SP4 update for kernel
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-gcp-7.0