Use-after-free in Linux kernel - CVE-2026-99270
Published: November 3, 2026
Vulnerability identifier: #VU158971
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-99270
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially cause a denial of service through a kernel use-after-free.
The vulnerability exists due to use-after-free in reqsk_timer_handler() when TCP socket migration fails at inet_ehash_insert() and a newly allocated request socket is freed without stopping its timer. A remote attacker can trigger the affected TCP socket migration failure to potentially cause a kernel crash when the timer accesses the freed request socket.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99270
Install security update from vendor's repository.
linux (Debian package) - update to 6.12.117-1