Out-of-bounds write in Linux kernel - CVE-2026-80536

Vulnerability identifier: #VU145959

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-80536

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to an out-of-bounds write in xlog_recover_do_reg_buffer() when processing a crafted XFS filesystem image during mount-time log recovery. A remote attacker can mount a specially crafted filesystem image to execute arbitrary code.

The issue is reachable during mount-time recovery on production kernels where the bounds check was enforced only by an ASSERT().

Linux kernel
Debian Linux
openEuler
Ubuntu
kernel
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-extra-modules
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
linux-nvidia-tegra (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 6.6.0-145.3.31.162
python3-perf-debuginfo - update to 6.6.0-145.3.31.162
python3-perf - update to 6.6.0-145.3.31.162
perf-debuginfo - update to 6.6.0-145.3.31.162
perf - update to 6.6.0-145.3.31.162
kernel-tools-devel - update to 6.6.0-145.3.31.162
kernel-tools-debuginfo - update to 6.6.0-145.3.31.162
kernel-tools - update to 6.6.0-145.3.31.162
kernel-source - update to 6.6.0-145.3.31.162
kernel-headers - update to 6.6.0-145.3.31.162
kernel-extra-modules - update to 6.6.0-145.3.31.162
kernel-devel - update to 6.6.0-145.3.31.162
kernel-debugsource - update to 6.6.0-145.3.31.162
kernel-debuginfo - update to 6.6.0-145.3.31.162
bpftool-debuginfo - update to 6.6.0-145.3.31.162
bpftool - update to 6.6.0-145.3.31.162
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1036.39+1
linux (Debian package) - update to 6.12.107-1

• https://git.kernel.org/stable/c/813f8136a2ce1fee266d02a7df73db6e8a541604
• https://git.kernel.org/stable/c/edaf5b6bd625356893da20d69a259b34a9de2694
• https://git.kernel.org/stable/c/f8288214459ead7e87d26e5822f62c14a4f2ed6b

• Out-of-bounds write in Linux kernel xfs
• Debian update for linux
• openEuler 24.03 LTS SP3 update for kernel
• Ubuntu update for linux-nvidia-tegra