SB20260720234 - Memory leak in Linux kernel ethtool
Published: July 20, 2026
Security Bulletin ID
SB20260720234
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Memory leak (CVE-ID: CVE-2026-63999)
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a memory leak in rss_prepare_get() in net/ethtool/rss.c when handling a get_rxfh operation failure. A local user can trigger an error path to cause a denial of service.
Remediation
Install update from vendor's website.