SB20260529180 - Use-after-free in Linux kernel ipv6
Published: May 29, 2026
Security Bulletin ID
SB20260529180
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local 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-2026-46120)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in ip6erspan_changelink() when changing link configuration after network namespace migration. A local user can trigger tunnel reinsertion into the wrong per-netns hash to cause a denial of service.
The issue is reachable from an unprivileged user namespace.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e
- https://git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2
- https://git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91
- https://git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82
- https://git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702