CVE-2026-89685

תיאור (מקור, אנגלית)

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.

מדדים

CVSS 3.1

7.5 (HIGH) מקור הציון: CNA CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — סבירות ניצול

1% (אחוזון 000) נכון ל-3/10/2026

קישורים

• https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8
• https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96
• https://git.kernel.org/stable/c/e92e80c5b043108029bc729b30d12c37158fb9cb
• https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016