Out-of-bounds write in Linux kernel - CVE-2026-80725

Vulnerability identifier: #VU146520

CSH Severity: Low

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

CVE-ID: CVE-2026-80725

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause memory corruption.

The vulnerability exists due to an out-of-bounds write in skb_gro_receive() and IPv6 GRO completion handling when processing crafted packets for BIG TCP aggregation beyond 64KB. A local user can inject specially crafted frames to cause memory corruption.

Exploitation requires access to inject crafted frames through AF_PACKET, and the issue is limited to older stable branches rather than mainline 7.0 and later.

Linux kernel
Debian Linux
openEuler
kernel-headers
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-extra-modules
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-headers - update to 6.6.0-145.3.35.166
python3-perf-debuginfo - update to 6.6.0-145.3.35.166
python3-perf - update to 6.6.0-145.3.35.166
perf-debuginfo - update to 6.6.0-145.3.35.166
perf - update to 6.6.0-145.3.35.166
kernel-tools-devel - update to 6.6.0-145.3.35.166
kernel-tools-debuginfo - update to 6.6.0-145.3.35.166
kernel-tools - update to 6.6.0-145.3.35.166
kernel-source - update to 6.6.0-145.3.35.166
kernel-extra-modules - update to 6.6.0-145.3.35.166
kernel-devel - update to 6.6.0-145.3.35.166
kernel-debugsource - update to 6.6.0-145.3.35.166
kernel-debuginfo - update to 6.6.0-145.3.35.166
bpftool-debuginfo - update to 6.6.0-145.3.35.166
bpftool - update to 6.6.0-145.3.35.166
kernel - update to 6.6.0-145.3.35.166
linux (Debian package) - update to 6.12.107-1

• https://git.kernel.org/stable/c/03cb8cc2961f5f781d12e903782cb3815ed84b1c
• https://git.kernel.org/stable/c/37a5dcd6837fc2afc44a7bc3ed8af4e983783d46
• https://git.kernel.org/stable/c/3ce832e2bd431d0c12ba525ed73ad8fbc4191da5
• https://git.kernel.org/stable/c/81be30c1f5f2bffda1f04c0efd0746af10b9643a
• https://git.kernel.org/stable/c/e907bf694ed55bdfe421be99dba35751a655df25

• Out-of-bounds write in Linux kernel core
• Debian update for linux
• openEuler 24.03 LTS SP3 update for kernel