Medium [CVE-2026-64519] Fix infinite loop in layout state revocation
This medium-severity Red Hat Linux advisory covers CVE-2026-64519 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9.
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Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix infinite loop in layout state revocation find_one_sb_stid() skips stids whose sc_status is non-zero, but the SC_TYPE_LAYOUT case in nfsd4_revoke_states() never sets sc_status before calling nfsd4_close_layout().
The retry loop therefore finds the same layout stid on every iteration, hanging the revoker indefinitely. A flaw was found in the Linux kernel's Network File System Daemon (NFSD).
This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by triggering an infinite loop during layout state revocation. The issue occurs because the system repeatedly attempts to revoke a layout state without properly updating its status, leading to the revoker hanging indefinitely.
Red Hat severity: Low — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-835.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
Mitigation checklist
- If the NFS server functionality is not required, disable the `nfs-server` service to prevent exploitation. ```bash systemctl stop nfs-server systemctl disable nfs-server ``` This action will stop all NFS server operations and prevent them from starting automatically. If the NFS server is in use, consider restricting network access to trusted clients via firewall rules.
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
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