Improper access control in Linux kernel - CVE-2026-74305

Vulnerability identifier: #VU142884

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-74305

CWE-ID: CWE-284

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to bypass intended cgroup storage compatibility checks.

The vulnerability exists due to improper access control in bpf prog-array compatibility checks when validating tail-call chains involving cgroup local storage. A local user can load a storage-less BPF program that performs tail calls to bridge between programs with incompatible storage cookies to bypass intended cgroup storage compatibility checks.

Exploitation requires the ability to load and use BPF programs that participate in tail-call chains.

Linux kernel
openEuler
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-extra-modules

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
python3-perf-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
python3-perf - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
perf-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
perf - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools-devel - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-source - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-headers - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-devel - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-debugsource - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
bpftool-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
bpftool - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160

• https://git.kernel.org/stable/c/10627ddc0167aab5c1c390a10ef461e9937aba08
• https://git.kernel.org/stable/c/1c762d28698483ce7c372091f34d86e4d4828652
• https://git.kernel.org/stable/c/46fbafe3d2d569d828e8d24a7dbe1659f63685cf
• https://git.kernel.org/stable/c/87177497cca90bf4fcfb759eb898560eb5b46a10
• https://git.kernel.org/stable/c/9ca06849c4239aa2d580c54651f8588c51cb398b
• https://git.kernel.org/stable/c/cb22dc79528eb26a46d346c3118dbd6b14c70609
• https://git.kernel.org/stable/c/eb73056ce2a6f101ddd3bdba89af6b24ebffff85

• Improper access control in Linux kernel bpf
• openEuler 24.03 LTS SP3 update for kernel
• openEuler 24.03 LTS SP1 update for kernel