SB2026110335 - Use-after-free in Linux kernel fs

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Main Vulnerability Database SB2026110335

SB2026110335 - Use-after-free in Linux kernel fs

Published: November 3, 2026

Security Bulletin ID SB2026110335
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-99218)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service and potentially execute arbitrary code in kernel context or disclose sensitive information.

The vulnerability exists due to use-after-free in the Linux kernel's coredump_finish() function when releasing parked threads without holding a task reference or read-copy-update (RCU) protection. A local user can trigger a race during core dump completion in which a released thread exits and its task structure is freed before wake_up_process() accesses it, causing access to freed kernel memory and potentially enabling code execution, information disclosure, or a system crash.


Remediation

Install update from vendor's website.

References