CVE-2026-89685nfsd: fix clock domain mismatch in clients_still_reclaiming()
- 7.5HighCVSS base score
- 0.61%Exploitation in 30 daysEPSS · top 50% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 49 days later
· 49 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.61% · top 50% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – < 7ca44a63d9a554ba7ad05b06d88746eab08b760e
- affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – < 2c9efc6b692a153643d0f204b3c3632cb6b5761e
- affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – < a22ee3a2cadef44f2edeb909ae36bd72450a3a35
- affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – < 04c3e4456fe76e8d7c94171009df3165c3262c51
- affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – < e92e80c5b043108029bc729b30d12c37158fb9cb
- affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – < f9cec313efb2fd18d962aad738a4892bce806016
- affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – < 9843649196221152b6e5d138a3ce859bdaae1d96
- affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – < 09ea3eb9a518565f5bca386e81b993ed8825f5e8
- affected 5.6
- unaffected < 5.6
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.224 – ≤ 5.15.*
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.51 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/7ca44a63d9a554ba7ad05b06d88746eab08b760e (opens in a new tab)
- https://git.kernel.org/stable/c/2c9efc6b692a153643d0f204b3c3632cb6b5761e (opens in a new tab)
- https://git.kernel.org/stable/c/a22ee3a2cadef44f2edeb909ae36bd72450a3a35 (opens in a new tab)
- https://git.kernel.org/stable/c/04c3e4456fe76e8d7c94171009df3165c3262c51 (opens in a new tab)
- https://git.kernel.org/stable/c/e92e80c5b043108029bc729b30d12c37158fb9cb (opens in a new tab)
- https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016 (opens in a new tab)
- https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96 (opens in a new tab)
- https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76597 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89685)Record last updated .