Improper input validation in Linux kernel - CVE-2026-68155

Vulnerability identifier: #VU142158

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-2026-68155

CWE-ID: CWE-20

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 input validation in ceph_monmap_decode() when processing a CEPH_MSG_MON_MAP monmap message. A remote attacker can send a specially crafted monmap advertising zero monitors to cause a denial of service.

The issue is triggered when the client later attempts to open a session with a monitor, causing an assertion in pick_new_mon() to fire.

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/0591a15815b498be628a937146e44487d599ba33
• https://git.kernel.org/stable/c/3b249546f59c3d6d3592c10657f82bc3f1faa07c
• https://git.kernel.org/stable/c/40480eee361ed9676b3f844d532ac28b47251634
• https://git.kernel.org/stable/c/cd0d41bc569632eaaeccde9d2a6bc919ec00c407
• https://git.kernel.org/stable/c/e67e8b694872c9bc66996040f9de9242f6236ed9

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