Out-of-bounds read in Linux kernel - CVE-2026-53223

Vulnerability identifier: #VU135533

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-53223

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in the generic timestamp cmsg path in net/socket.c when processing timestamped messages for AF_PACKET sockets. A local user can send or receive crafted packets on an AF_PACKET socket to disclose sensitive information.

Exploitation requires timestamping to be enabled, and information disclosure can occur when SO_RXQ_OVFL is enabled and a non-linear skb is processed.

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/1ee90b77b727df903033db873c75caac5c27ec98
• https://git.kernel.org/stable/c/24a0d548d3a765cd4558224e4f8e06e14cba26e3
• https://git.kernel.org/stable/c/3dde4fb941fa5649ab809f6cd3e20e0c424a4e31
• https://git.kernel.org/stable/c/71ff5cdd5da61d0438e902aa0fd68c28bc901abe
• https://git.kernel.org/stable/c/ad9a0374ee6d11048e1f74cd5180bad58b9848b4
• https://git.kernel.org/stable/c/b903e9b5629ec8dd6db92174070045bf81ad7060
• https://git.kernel.org/stable/c/e0665b2a8e90bb08bd205062c75662b502d31797
• https://git.kernel.org/stable/c/eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a

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