SB20260816386 - Double free in Linux kernel xfrm
Published: August 16, 2026
Security Bulletin ID
SB20260816386
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-2026-72137)
CWE-ID: CWE-415 - Double Free
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to double free in nat_keepalive_send() when handling send errors after handing a keepalive skb to the IPv4 or IPv6 output path. A local user can trigger an error during keepalive packet transmission to cause a denial of service.
The issue occurs because the skb may already have been consumed by the networking stack before an error is returned.
Remediation
Install update from vendor's website.