UNKNOWN NVD
CVE-2026-89685
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix clock domain mismatch in clients_still_reclaiming() clients_still_reclaiming() c
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
- https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8
- https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96
- https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016
This unknown severity vulnerability was published on 2026-09-11 via NVD.
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