CVE-2026-45983

MEDIUM EPSS 2.4%
Published May 27, 20261mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: never defer requests during idmap lookup During v4 request compound arg decoding, some ops (e.g. SETATTR) can trigger idmap lookup upcalls. When those upcall responses get delayed beyond the allowed time limit, cache_check() will mark the request for deferral and cause it to be dropped. This prevents nfs4svc_encode_compoundres from being executed, and thus the session slot flag NFSD4_SLOT_INUSE never gets cleared. Subsequent client requests will fail with NFSERR_JUKEBOX, given that the slot will be marked as in-use, making the SEQUENCE op fail. Fix this by making sure that the RQ_USEDEFERRAL flag is always clear during nfs4svc_decode_compoundargs(), since no v4 request should ever be deferred.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥2.6.30  –  <5.10.252
linuxlinux_kernel*≥5.11  –  <5.15.202
linuxlinux_kernel*≥5.16  –  <6.1.165
linuxlinux_kernel*≥6.2  –  <6.6.128
linuxlinux_kernel*≥6.7  –  <6.12.75
linuxlinux_kernel*≥6.13  –  <6.18.14
linuxlinux_kernel*≥6.19  –  <6.19.4

References 8

  • git.kernel.org https://git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb
    Patch