SB2026081651 - Use-after-free in Linux kernel ipv4
Published: August 16, 2026
Security Bulletin ID
SB2026081651
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
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-2026-72323)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to use-after-free in the IGMP timer callback when processing incoming IGMP queries during device teardown. A remote attacker can send a crafted IGMP query to cause a denial of service.
Exploitation requires a race between device destruction and IGMP query processing.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/165258303357e54b75fc19b341ae2a2b7c9e3910
- https://git.kernel.org/stable/c/40a1e998cb266ed4cb529a0bb4fee2b0ba732702
- https://git.kernel.org/stable/c/75e984fe0cb9e7fbde0c8ee838c61ce8573d3ea3
- https://git.kernel.org/stable/c/7b19c0f81ed1fdaec6bc522569be367199a9edf3
- https://git.kernel.org/stable/c/8d4394ffa40508e0de72f464af351f6ca6a6cdc3