Improper control of a resource through its lifetime in Linux kernel - CVE-2026-74356

Vulnerability identifier: #VU142829

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2026-74356

CWE-ID: CWE-664

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper state management in vhost_get_avail_idx in the vhost subsystem when handling available ring entries with mergeable buffers enabled. A local user can trigger repeated processing of available entries to cause a denial of service.

The issue can lead to a host livelock when the guest is not making progress and notifications are re-enabled while entries remain in the ring.

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

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 6.6.0-145.3.31.162
bpftool - update to 6.6.0-145.3.31.162
bpftool-debuginfo - update to 6.6.0-145.3.31.162
kernel-debuginfo - update to 6.6.0-145.3.31.162
kernel-debugsource - update to 6.6.0-145.3.31.162
kernel-devel - update to 6.6.0-145.3.31.162
kernel-extra-modules - update to 6.6.0-145.3.31.162
kernel-headers - update to 6.6.0-145.3.31.162
kernel-source - update to 6.6.0-145.3.31.162
kernel-tools - update to 6.6.0-145.3.31.162
kernel-tools-debuginfo - update to 6.6.0-145.3.31.162
kernel-tools-devel - update to 6.6.0-145.3.31.162
perf - update to 6.6.0-145.3.31.162
perf-debuginfo - update to 6.6.0-145.3.31.162
python3-perf - update to 6.6.0-145.3.31.162
python3-perf-debuginfo - update to 6.6.0-145.3.31.162

• https://git.kernel.org/stable/c/09861858a68342f851f71c669ac0f69865c32151
• https://git.kernel.org/stable/c/7f229d27bf27c7e589eca690d8612763a7a4801f
• https://git.kernel.org/stable/c/a9326b652bc7acd748d7a1143573845c7924d847
• https://git.kernel.org/stable/c/e115471008111f894c6528d9ab2ce7d0ce306f35

• Improper control of a resource through its lifetime in Linux kernel vhost driver
• openEuler 24.03 LTS SP3 update for kernel