Use-after-free in Linux kernel - CVE-2026-53259
Published: June 26, 2026
Vulnerability identifier: #VU135499
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-53259
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to a use-after-free in ipv6 anycast address handling in net/ipv6/anycast.c when racing anycast address insertion and device teardown. A local attacker can trigger concurrent anycast join and teardown operations to cause a denial of service.
The issue occurs because a freed ifacaddr6 object can remain linked in the global inet6_acaddr_lst[] hash and later be dereferenced by readers under RCU.
How to mitigate CVE-2026-53259
Install security update from vendor's repository.