SB20261103110 - Use-after-free in Linux kernel ipv4

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Main Vulnerability Database SB20261103110

SB20261103110 - Use-after-free in Linux kernel ipv4

Published: November 3, 2026

Security Bulletin ID SB20261103110
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-99270)

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 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.


Remediation

Install update from vendor's website.

References