Use-after-free in Linux kernel - CVE-2026-72322

Vulnerability identifier: #VU143112

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-72322

CWE-ID: CWE-416

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 a use-after-free in the IPv6 MLD delayed work handling in net/ipv6/mcast.c when processing incoming MLD queries during device teardown. A remote attacker can send crafted MLD query traffic to trigger a kernel panic and cause a denial of service.

The issue arises from a race condition between device destruction and packet receive processing under RCU protection.

Linux kernel
openEuler
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
python3-perf-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 4.19.90-2609.3.0.0391
bpftool - update to 4.19.90-2609.3.0.0391
bpftool-debuginfo - update to 4.19.90-2609.3.0.0391
kernel-debuginfo - update to 4.19.90-2609.3.0.0391
kernel-debugsource - update to 4.19.90-2609.3.0.0391
kernel-devel - update to 4.19.90-2609.3.0.0391
kernel-source - update to 4.19.90-2609.3.0.0391
kernel-tools - update to 4.19.90-2609.3.0.0391
kernel-tools-debuginfo - update to 4.19.90-2609.3.0.0391
kernel-tools-devel - update to 4.19.90-2609.3.0.0391
perf - update to 4.19.90-2609.3.0.0391
perf-debuginfo - update to 4.19.90-2609.3.0.0391
python2-perf - update to 4.19.90-2609.3.0.0391
python2-perf-debuginfo - update to 4.19.90-2609.3.0.0391
python3-perf - update to 4.19.90-2609.3.0.0391
python3-perf-debuginfo - update to 4.19.90-2609.3.0.0391

• https://git.kernel.org/stable/c/0401d6cf7877c9be36652385dfcbf7f891b8b590
• https://git.kernel.org/stable/c/0458ba1cda830ba4ccfcd9e19c0891438bcdbe4e
• https://git.kernel.org/stable/c/9815e834f5ff8b39e0ea9f0dbd532f4a3b8f0785
• https://git.kernel.org/stable/c/9b26518b6896a16b809b1e42986f4ebac7bccc1e
• https://git.kernel.org/stable/c/9ce741c22df4fd9546e30306317ac7df3607e48f
• https://git.kernel.org/stable/c/ebbebf6cee950d7f1c81990256c0eae9e62572ae
• https://git.kernel.org/stable/c/f03b0a45535d49bdab7e502efaacee205b2a7865
• https://git.kernel.org/stable/c/f12b63ef26a035c5a29b3ef56401e38199010d4a

• Use-after-free in Linux kernel ipv6
• openEuler 20.03 LTS SP4 update for kernel