CVE-2026-89685

CVE CVE-2026-89685EUVD EUVD-2026-76597Published 2026-09-11T19:46:07.000ZLast changed 2026-09-13T06:33:08.000ZCVSS 7.5

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 7.3-rc1; 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf <f9cec313efb2fd18d962aad738a4892bce806016; 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf <9843649196221152b6e5d138a3ce859bdaae1d96; 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf <09ea3eb9a518565f5bca386e81b993ed8825f5e8; patch: 7.2.4; patch: 0; 5.6; patch: 6.18.51

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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