CVE-2026-89685
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.
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Affected products
4- osv-coords2 versions
>= 5.6.0, < 6.6.160+ 1 more
- (no CPE)range: >= 5.6.0, < 6.6.160
- (no CPE)range: < 7.2.6-1.1
Patches
Vulnerability mechanics
References
5- git.kernel.org/stable/c/04c3e4456fe76e8d7c94171009df3165c3262c51nvd
- git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8nvd
- git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96nvd
- git.kernel.org/stable/c/e92e80c5b043108029bc729b30d12c37158fb9cbnvd
- git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016nvd
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