SB2026091280 - Use-after-free in Linux kernel nfsd
Published: September 12, 2026
Security Bulletin ID
SB2026091280
CSH Severity
Low
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) Use-after-free (CVE-ID: CVE-2026-89703)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to trigger a use-after-free.
The vulnerability exists due to use-after-free in nfsd4_drop_revoked_stid() when handling FREE_STATEID for admin-revoked delegations. A remote user can cause a freed delegation to be added to cl_revoked to trigger a use-after-free.
Remediation
Install update from vendor's website.