In the Linux kernel, the following vulnerability has been resolved: nfsd: fix clock domain...
🔗 CVE IDs covered (1)
📋 Description
In the Linux kernel, the following vulnerability has been resolved:
nfsd: fix clock domain mismatch in clients_still_reclaiming()
clients_still_reclaiming() computes a deadline from nn->boot_time (CLOCK_REALTIME, ~1.7 billion) but compares it against ktime_get_boottime_seconds() (CLOCK_BOOTTIME, seconds since boot). The comparison is always false — it would take ~54 years of uptime for BOOTTIME to exceed the REALTIME-derived deadline.
This means any client can hold the server in grace indefinitely by sending CLAIM_PREVIOUS OPEN requests, blocking all non-reclaim operations for all other clients.
Add boot_time_bt (CLOCK_BOOTTIME) alongside the existing boot_time and use it for the deadline computation. boot_time (CLOCK_REALTIME) is preserved for its cl_boot clientid-nonce role.
🔗 References (6)
- https://nvd.nist.gov/vuln/detail/CVE-2026-89685
- https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8
- https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96
- https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016
- https://git.kernel.org/stable/c/e92e80c5b043108029bc729b30d12c37158fb9cb
- https://github.com/advisories/GHSA-3574-3v33-rcrf