Out-of-bounds read in Linux kernel - CVE-2025-21789

Vulnerability identifier: #VU104983

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-2025-21789

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to an out-of-bounds read error within the do_csum() function in arch/loongarch/lib/csum.c. A local user can perform a denial of service (DoS) attack.

Linux kernel
openEuler
bpftool
kernel
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

Install update from vendor's website.

Linux kernel - update to 6.13.4
bpftool - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
python3-perf-debuginfo - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
python3-perf - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
perf-debuginfo - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
perf - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-tools-devel - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-tools-debuginfo - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-tools - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-source - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-headers - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-devel - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-debugsource - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-debuginfo - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
bpftool-debuginfo - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86

• https://git.kernel.org/stable/c/6287f1a8c16138c2ec750953e35039634018c84a
• https://git.kernel.org/stable/c/964a8895704a22efc06a2a3276b624a5ae985a06
• https://git.kernel.org/stable/c/9f15a8df542c0f08732a67d1a14ee7c22948fb97
• https://git.kernel.org/stable/c/d6508ffff32b44b6d0de06704034e4eef1c307a7
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.4

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