Improper input validation in Linux kernel - CVE-2026-53131

Vulnerability identifier: #VU135651

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-2026-53131

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 netfilter Ethernet header handling when processing packets that reach ip6t_eui64, xt_mac, ipset bitmap:ip,mac, hash:ip,mac, hash:mac, or nf_log_syslog code paths without a valid Ethernet MAC header. A remote attacker can send a specially crafted packet to cause a denial of service.

The issue occurs because these paths access eth_hdr(skb) after insufficient validation that the skb is associated with an Ethernet device and that a full MAC header is present.

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/063f43361e884acd7300790e90194430275d0d0c
• https://git.kernel.org/stable/c/367abcacc13a8e2e7624408b7f593bd1e60e49d9
• https://git.kernel.org/stable/c/4435888e1bf139d2bfe5911643d4217382136743
• https://git.kernel.org/stable/c/5d634afb8b83b49de562792fd0d047416a43bd4d
• https://git.kernel.org/stable/c/62443dc21114c0bbc476fa62973db89743f2f137
• https://git.kernel.org/stable/c/726abf97566867f808fec9d8a408eb9698bd570a
• https://git.kernel.org/stable/c/cea435ea7e868ea6fdf039bc4f2090c1d829b556

• Improper input validation in Linux kernel netfilter
• openEuler 24.03 LTS SP1 update for kernel