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Vulnerability · Published Sep 11, 2026 · Assigned by Linux

CVE-2026-89685nfsd: fix clock domain mismatch in clients_still_reclaiming()

High 7.5

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 50.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-89685
Debian:13linux6.12.111-1DEBIAN-CVE-2026-89685
Debian:14linux7.2.6-1DEBIAN-CVE-2026-89685
Debian:12linux-6.126.12.111-1~deb12u1DEBIAN-CVE-2026-89685
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1038.42UBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-89685
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-89685
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-89685
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-89685

Affected products (as reported)

VendorProductVersions
Linux Linux 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – before 7ca44a63d9a554ba7ad05b06d88746eab08b760e20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – before 2c9efc6b692a153643d0f204b3c3632cb6b5761e20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – before a22ee3a2cadef44f2edeb909ae36bd72450a3a3520b7d86f29d39e8ae19bb29c24ffee70dc385ddf – before 04c3e4456fe76e8d7c94171009df3165c3262c5120b7d86f29d39e8ae19bb29c24ffee70dc385ddf – before e92e80c5b043108029bc729b30d12c37158fb9cb20b7d86f29d39e8ae19bb29c24ffee70dc385ddf – before f9cec313efb2fd18d962aad738a4892bce80601620b7d86f29d39e8ae19bb29c24ffee70dc385ddf – before 9843649196221152b6e5d138a3ce859bdaae1d9620b7d86f29d39e8ae19bb29c24ffee70dc385ddf – before 09ea3eb9a518565f5bca386e81b993ed8825f5e8
Linux Linux 5.6

References