SB2026091294 - Missing Release of Resource after Effective Lifetime in Linux kernel nfsd
Published: September 12, 2026
Security Bulletin ID
SB2026091294
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-89683)
CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to consume system resources.
The vulnerability exists due to missing release of a resource in nfsd_set_fh_dentry() when processing crafted NFSv3 filehandles targeting a V4ROOT export's fsid. A remote attacker can send a crafted NFSv3 filehandle to consume system resources.
The dentry reference leak is triggered on every request.
Remediation
Install update from vendor's website.