Use-after-free in Linux kernel - CVE-2026-53275
Published: June 26, 2026
Vulnerability identifier: #VU135480
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-53275
CWE-ID: CWE-416
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-53275
Install security update from vendor's repository.
Sources
- 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