Use-after-free in Linux kernel - CVE-2026-53275

Vulnerability identifier: #VU135480

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-53275

CWE-ID: CWE-416

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to use-after-free in __mld_query_work in net/ipv6/mcast.c when processing crafted MLD queries. A remote attacker can send a specially crafted MLD query packet to cause a denial of service.

The issue occurs because a pointer to the multicast group address is dereferenced after skb header reallocation following pskb_may_pull() calls.

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 5.10.0-323.0.0.224
bpftool - update to 5.10.0-323.0.0.224
bpftool-debuginfo - update to 5.10.0-323.0.0.224
kernel-debuginfo - update to 5.10.0-323.0.0.224
kernel-debugsource - update to 5.10.0-323.0.0.224
kernel-devel - update to 5.10.0-323.0.0.224
kernel-headers - update to 5.10.0-323.0.0.224
kernel-source - update to 5.10.0-323.0.0.224
kernel-tools - update to 5.10.0-323.0.0.224
kernel-tools-debuginfo - update to 5.10.0-323.0.0.224
kernel-tools-devel - update to 5.10.0-323.0.0.224
perf - update to 5.10.0-323.0.0.224
perf-debuginfo - update to 5.10.0-323.0.0.224
python3-perf - update to 5.10.0-323.0.0.224
python3-perf-debuginfo - update to 5.10.0-323.0.0.224

• https://git.kernel.org/stable/c/087dbacf897c020f438f780f0a4a8aa73b6d7c5a
• https://git.kernel.org/stable/c/1354271c89d0e5fbf8b3d94097ff0216695209c7
• https://git.kernel.org/stable/c/2a613bf497029d555a7428406aa8cdb84a503cea
• https://git.kernel.org/stable/c/4203806f700bb44ea0b05d484d9d40044b47fb04
• https://git.kernel.org/stable/c/53baa63a4183291574483f89583dbef13677a2c4
• https://git.kernel.org/stable/c/791c91dc7a9dfb2457d5e29b8216a6484b9c4b40
• https://git.kernel.org/stable/c/b2eb8886200b907fc71806869620609f0f4cacb0

• Use-after-free in Linux kernel ipv6
• openEuler 22.03 LTS SP4 update for kernel