Use-after-free in Linux kernel - CVE-2026-31663

Vulnerability identifier: #VU127741

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-2026-31663

CWE-ID: CWE-416

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 a use-after-free in xfrm_input_resume and transport_finish when processing packets after asynchronous crypto completion. A local user can trigger a race with device teardown to cause a denial of service.

Linux kernel
Debian Linux
openEuler
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
bpftool
kernel
kernel-extra-modules
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
python3-perf-debuginfo - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
python3-perf - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
perf-debuginfo - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
perf - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-tools-devel - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-tools-debuginfo - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-tools - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-source - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-headers - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-devel - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-debugsource - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-debuginfo - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
bpftool-debuginfo - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
bpftool - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-extra-modules - update to 6.6.0-145.3.17.150
linux (Debian package) - update to 6.12.94-1

• https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b
• https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb
• https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2

• Use-after-free in Linux kernel xfrm
• Debian update for linux
• openEuler 24.03 LTS SP3 update for kernel
• openEuler 24.03 LTS SP1 update for kernel