Improper control of a resource through its lifetime in Linux kernel - CVE-2026-80527

Vulnerability identifier: #VU145964

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-80527

CWE-ID: CWE-664

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper state management in __ceph_get_caps() when handling Ceph capability revocation and reacquisition. A remote attacker can trigger conflicting operations that leave stale mds_wanted state and cause a reader to wait indefinitely to cause a denial of service.

The issue occurs when a cap update requesting FILE_RD does not reach the MDS after mds_wanted has been raised, leaving the client without the wanted file read capability while local state still indicates it is wanted.

Linux kernel
openEuler
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
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 5.10.0-331.0.0.232
bpftool - update to 5.10.0-331.0.0.232
bpftool-debuginfo - update to 5.10.0-331.0.0.232
kernel-debuginfo - update to 5.10.0-331.0.0.232
kernel-debugsource - update to 5.10.0-331.0.0.232
kernel-devel - update to 5.10.0-331.0.0.232
kernel-headers - update to 5.10.0-331.0.0.232
kernel-source - update to 5.10.0-331.0.0.232
kernel-tools - update to 5.10.0-331.0.0.232
kernel-tools-debuginfo - update to 5.10.0-331.0.0.232
kernel-tools-devel - update to 5.10.0-331.0.0.232
perf - update to 5.10.0-331.0.0.232
perf-debuginfo - update to 5.10.0-331.0.0.232
python3-perf - update to 5.10.0-331.0.0.232
python3-perf-debuginfo - update to 5.10.0-331.0.0.232

• https://git.kernel.org/stable/c/50958bb928bad3bdba9e5d1b7ff4bbadcf6951e6
• https://git.kernel.org/stable/c/5e84bc6f67e19fdd192d8b215de728acbfc12572
• https://git.kernel.org/stable/c/5fedf279a1ea369d39c8b06dd4547cdc576065d0
• https://git.kernel.org/stable/c/9e55fe24c548ad3163903eb58bb002d28d32a630
• https://git.kernel.org/stable/c/a3bc6b3e9ef3f5f5cb85a902a30a090c7931127c
• https://git.kernel.org/stable/c/b5661524c5a45085a866864ca9b8ae2513dfd67a
• https://git.kernel.org/stable/c/e05c315b4da0c16ea800ee4b2cb6c617f586d1b5
• https://git.kernel.org/stable/c/fcce1b3be6d286aa80831e730289f4c062053ae6

• Improper control of a resource through its lifetime in Linux kernel ceph
• openEuler 22.03 LTS SP4 update for kernel