SB20260424297 - Double free in Linux kernel core
Published: April 24, 2026
Security Bulletin ID
SB20260424297
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) Double free (CVE-ID: CVE-2026-31429)
CWE-ID: CWE-415 - Double 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 cross-cache free in skb_kfree_head() when freeing KFENCE-allocated skb head data. A local user can trigger allocation and freeing of a specially sized skb head object to cause a denial of service.
Exploitation requires KFENCE to be enabled.
Remediation
Install update from vendor's website.