SB2026062646 - Use-after-free in Linux kernel ipv6
Published: June 26, 2026
Security Bulletin ID
SB2026062646
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-53275)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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
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.
Remediation
Install update from vendor's website.
References
- 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