Improper input validation in Linux kernel - CVE-2026-31777

Vulnerability identifier: #VU128911

CSH Severity: Low

CVSS v4 BT: 4.3 [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/E:U/U:Clear]

CVE-ID: CVE-2026-31777

CWE-ID: CWE-20

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 input validation in the ctxfi driver when handling index mapping results. A local user can trigger an error condition to cause a denial of service.

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 5.10.0-317.0.0.220
bpftool - update to 5.10.0-317.0.0.220
bpftool-debuginfo - update to 5.10.0-317.0.0.220
kernel-debuginfo - update to 5.10.0-317.0.0.220
kernel-debugsource - update to 5.10.0-317.0.0.220
kernel-devel - update to 5.10.0-317.0.0.220
kernel-headers - update to 5.10.0-317.0.0.220
kernel-source - update to 5.10.0-317.0.0.220
kernel-tools - update to 5.10.0-317.0.0.220
kernel-tools-debuginfo - update to 5.10.0-317.0.0.220
kernel-tools-devel - update to 5.10.0-317.0.0.220
perf - update to 5.10.0-317.0.0.220
perf-debuginfo - update to 5.10.0-317.0.0.220
python3-perf - update to 5.10.0-317.0.0.220
python3-perf-debuginfo - update to 5.10.0-317.0.0.220

• https://git.kernel.org/stable/c/277c6960d4ddb94d16198afd70c92c3d4593d131
• https://git.kernel.org/stable/c/d4d3b8cbb70a2de247cbfe99bdb232aef9ed59bc

• Improper input validation in Linux kernel pci ctxfi
• openEuler 22.03 LTS SP4 update for kernel