SB20260918432 - Improper resource shutdown or release in Linux kernel nfs
Published: September 18, 2026
Security Bulletin ID
SB20260918432
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper resource shutdown or release (CVE-ID: CVE-2026-90234)
CWE-ID: CWE-404 - Improper Resource Shutdown or Release
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper resource shutdown or release in nfs_inode_set_delegation() when handling NFS delegation grants during error flows. A remote attacker can trigger a delegation recall that races with a re-open operation to cause a denial of service.
Remediation
Install update from vendor's website.