Out-of-bounds write in Linux kernel - CVE-2026-72157

Vulnerability identifier: #VU143435

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-2026-72157

CWE-ID: CWE-787

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to corrupt memory.

The vulnerability exists due to an out-of-bounds write in tbnet_poll() when processing a multi-frame ThunderboltIP packet with a peer-supplied frame_count that exceeds the fragment array capacity. A remote attacker can send a specially crafted packet with 19 or more small frames to corrupt memory.

The issue occurs because the first frame is placed in the skb linear area while subsequent frames are added as page fragments.

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

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
python3-perf-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
python3-perf - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
perf-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
perf - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools-devel - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-source - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-headers - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-devel - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-debugsource - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
bpftool-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
bpftool - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160

• https://git.kernel.org/stable/c/2b3b4e5ff5a58ad32817824b0310e63908b12052
• https://git.kernel.org/stable/c/55d9895f89970501fe126d1026b586b04a224c27
• https://git.kernel.org/stable/c/e27beb4536cbf1d59e2d8c2840e87d972aba906f
• https://git.kernel.org/stable/c/e5824d5b841d99a2bcdd4e2c256643293bbc22c1
• https://git.kernel.org/stable/c/fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3

• Out-of-bounds write in Linux kernel net thunderbolt driver
• openEuler 24.03 LTS SP3 update for kernel
• openEuler 24.03 LTS SP1 update for kernel