nfsd: fix clock domain mismatch in clients_still_reclaiming() (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.61 % · percentile 49 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
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
- https://git.kernel.org/stable/c/7ca44a63d9a554ba7ad05b06d88746eab08b760e
- https://git.kernel.org/stable/c/2c9efc6b692a153643d0f204b3c3632cb6b5761e
- https://git.kernel.org/stable/c/a22ee3a2cadef44f2edeb909ae36bd72450a3a35
- https://git.kernel.org/stable/c/04c3e4456fe76e8d7c94171009df3165c3262c51
- https://git.kernel.org/stable/c/e92e80c5b043108029bc729b30d12c37158fb9cb
- https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016
- https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96
- https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | Linux |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-76597
- GCVE · GCVE-0-2026-89685
CERT-FR advisories
- CERTFR-2026-AVI-1432 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1372 — Multiples vulnérabilités dans les produits SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf < 7ca44a63d9a554ba7ad05b06d88746eab08b760e ; affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf < 2c9efc6b692a153643d0f204b3c3632cb6b5761e ; affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf < a22ee3a2cadef44f2edeb909ae36bd72450a3a35 ; affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf < 04c3e4456fe76e8d7c94171009df3165c3262c51 ; affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf < e92e80c5b043108029bc729b30d12c37158fb9cb ; affected 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf < f9cec313efb2fd18d962aad738a4892bce806016 |
| Linux · Linux | affected 5.6 ; unaffected 0 < 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.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |