Out-of-bounds read in Linux kernel - CVE-2026-53230

Vulnerability identifier: #VU135558

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2026-53230

CWE-ID: CWE-125

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 an out-of-bounds read in mlx5_query_nic_vport_mac_list when querying a VF vport MAC list with a larger configured maximum than the PF capability-based buffer size. A local user can configure or trigger processing of a VF vport with a larger MAC list to cause a denial of service.

The issue occurs in the mlx5 driver while handling vport address list updates.

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 6.6.0-145.1.20.157
bpftool - update to 6.6.0-145.1.20.157
bpftool-debuginfo - update to 6.6.0-145.1.20.157
kernel-debuginfo - update to 6.6.0-145.1.20.157
kernel-debugsource - update to 6.6.0-145.1.20.157
kernel-devel - update to 6.6.0-145.1.20.157
kernel-headers - update to 6.6.0-145.1.20.157
kernel-source - update to 6.6.0-145.1.20.157
kernel-tools - update to 6.6.0-145.1.20.157
kernel-tools-debuginfo - update to 6.6.0-145.1.20.157
kernel-tools-devel - update to 6.6.0-145.1.20.157
perf - update to 6.6.0-145.1.20.157
perf-debuginfo - update to 6.6.0-145.1.20.157
python3-perf - update to 6.6.0-145.1.20.157
python3-perf-debuginfo - update to 6.6.0-145.1.20.157

• https://git.kernel.org/stable/c/0f807764bb122fd63aa45f4229cb1ef2679fbd40
• https://git.kernel.org/stable/c/2398e497389ed4be43f7cfbab499b49cec7dae1a
• https://git.kernel.org/stable/c/41781f2789309462520a93822e946521ed78f97f
• https://git.kernel.org/stable/c/537d87784e81c3d7037525b99416455cee088cdc
• https://git.kernel.org/stable/c/894e036a24a26a6dd7b17d8d3fb5c53ab48a6074

• Out-of-bounds read in Linux kernel linux mlx5
• openEuler 24.03 LTS SP1 update for kernel