PT-2026-43850 · Linux+4 · Linux+161

Published 2026-05-27 · Updated 2026-06-15 · CVE-2026-45983

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the nfsd component where certain operations, such as SETATTR, can trigger idmap lookup upcalls during v4 request compound argument decoding. If these upcall responses are delayed beyond the allowed time limit, the cache check() function marks the request for deferral, causing it to be dropped. This prevents the nfs4svc encode compoundres() function from executing, which leaves the session slot flag NFSD4 SLOT INUSE uncleared. Consequently, subsequent client requests fail with NFSERR JUKEBOX because the slot remains marked as in-use, causing the SEQUENCE operation to fail.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-45983

SUSE-SU-2026:22108-1

Affected Products

Linux

Kernel-Default

Kernel-Default-Base

Kernel-Kvmsmall

Kernel-Source

Linux-Allwinner-5.19

Linux-Aws

Linux-Aws-5.0

Linux-Aws-5.11

Linux-Aws-5.13

Linux-Aws-5.15

Linux-Aws-5.19

Linux-Aws-5.3

Linux-Aws-5.4

Linux-Aws-5.8

Linux-Aws-6.14

Linux-Aws-6.17

Linux-Aws-6.2

Linux-Aws-6.5

Linux-Aws-6.8

Linux-Aws-Fips

Linux-Aws-Hwe

Linux-Azure

Linux-Azure-4.15

Linux-Azure-5.11

Linux-Azure-5.13

Linux-Azure-5.15

Linux-Azure-5.19

Linux-Azure-5.3

Linux-Azure-5.4

Linux-Azure-5.8

Linux-Azure-6.11

Linux-Azure-6.14

Linux-Azure-6.17

Linux-Azure-6.2

Linux-Azure-6.5

Linux-Azure-6.8

Linux-Azure-Edge

Linux-Azure-Fde

Linux-Azure-Fde-5.15

Linux-Azure-Fde-5.19

Linux-Azure-Fde-6.14

Linux-Azure-Fde-6.17

Linux-Azure-Fde-6.2

Linux-Azure-Fde-6.8

Linux-Azure-Fips

Linux-Azure-Nvidia

Linux-Azure-Nvidia-6.14

Linux-Bluefield

Linux-Fips

Linux-Gcp

Linux-Gcp-4.15

Linux-Gcp-5.11

Linux-Gcp-5.13

Linux-Gcp-5.15

Linux-Gcp-5.19

Linux-Gcp-5.3

Linux-Gcp-5.4

Linux-Gcp-5.8

Linux-Gcp-6.11

Linux-Gcp-6.14

Linux-Gcp-6.17

Linux-Gcp-6.2

Linux-Gcp-6.5

Linux-Gcp-6.8

Linux-Gcp-Fips

Linux-Gke

Linux-Gke-4.15

Linux-Gkeop-5.15

Linux-Gke-5.4

Linux-Gkeop

Linux-Hwe

Linux-Hwe-5.11

Linux-Hwe-5.13

Linux-Hwe-5.15

Linux-Hwe-5.19

Linux-Hwe-5.4

Linux-Hwe-5.8

Linux-Hwe-6.11

Linux-Hwe-6.14

Linux-Hwe-6.17

Linux-Hwe-6.2

Linux-Hwe-6.5

Linux-Hwe-6.8

Linux-Hwe-Edge

Linux-Ibm

Linux-Ibm-5.15

Linux-Ibm-5.4

Linux-Ibm-6.8

Linux-Intel-5.13

Linux-Intel-Iot-Realtime

Linux-Intel-Iotg

Linux-Intel-Iotg-5.15

Linux-Iot

Linux-Kvm

Linux-Lowlatency

Linux-Lowlatency-Hwe-5.15

Linux-Lowlatency-Hwe-5.19

Linux-Lowlatency-Hwe-6.11

Linux-Lowlatency-Hwe-6.2

Linux-Lowlatency-Hwe-6.5

Linux-Lowlatency-Hwe-6.8

Linux-Lts

Linux-Lts-Xenial

Linux-Nvidia

Linux-Nvidia-6.11

Linux-Nvidia-6.17

Linux-Nvidia-6.2

Linux-Nvidia-6.5

Linux-Nvidia-6.8

Linux-Nvidia-Lowlatency

Linux-Nvidia-Tegra

Linux-Nvidia-Tegra-5.15

Linux-Nvidia-Tegra-Igx

Linux-Oem

Linux-Oem-5.10

Linux-Oem-5.13

Linux-Oem-5.14

Linux-Oem-5.17

Linux-Oem-5.6

Linux-Oem-6.0

Linux-Oem-6.1

Linux-Oem-6.11

Linux-Oem-6.14

Linux-Oem-6.17

Linux-Oem-6.5

Linux-Oem-6.8

Linux-Oracle

Linux-Oracle-5.0

Linux-Oracle-5.11

Linux-Oracle-5.13

Linux-Oracle-5.15

Linux-Oracle-5.3

Linux-Oracle-5.4

Linux-Oracle-5.8

Linux-Oracle-6.14

Linux-Oracle-6.17

Linux-Oracle-6.5

Linux-Oracle-6.8

Linux-Raspi

Linux-Raspi-5.4

Linux-Raspi-Realtime

Linux-Raspi2

Linux-Realtime

Linux-Realtime-6.14

Linux-Realtime-6.17

Linux-Realtime-6.8

Linux-Riscv

Linux-Riscv-5.11

Linux-Riscv-5.15

Linux-Riscv-5.19

Linux-Riscv-5.8

Linux-Riscv-6.14

Linux-Riscv-6.17

Linux-Riscv-6.5

Linux-Riscv-6.8

Linux-Starfive-5.19

Linux-Starfive-6.2

Linux-Starfive-6.5

Linux-Xilinx

Linux-Xilinx-Zynqmp

Linux Kernel

References · 226

• https://git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593 · Patch
• https://git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd · Patch
• https://ubuntu.com/security/CVE-2026-45983 · Vendor Advisory
• https://git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93 · Patch
• https://git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-45983 · Vendor Advisory
• https://git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9 · Patch
• https://git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-45983 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2026-45983 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-45983 · Vendor Advisory
• https://git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-45983 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-45983 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:22108-1 · Vendor Advisory