5.5

CVE-2026-45983: linux

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-45983DEBIAN-CVE-2026-45983
Published 27-05-2026Last modified 27-05-2026
Open JSON

Vulnerability summary

CVE-2026-45983 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.1% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 37 · Related 37
OPENSUSE-SU-2026:21388-1SUSE-SU-2026:22108-1SUSE-SU-2026:22137-1SUSE-SU-2026:22433-1SUSE-SU-2026:22458-1SUSE-SU-2026:22742-1

Timeline

  1. 27-05-2026
    PublishedVulnerability first disclosed.

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.04 pp

From 0.12% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-134.134
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1060.63
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 2f425878b6a71571341dcd3f9e9d1a6f6355da9c, < b9abb760db20504240a7147f27934d900cd80b23 | ≥ 2f425878b6a71571341dcd3f9e9d1a6f6355da9c, < 3a72c7dedc99b321e0f267e4e999e5baf07c4593 | ≥ 2f425878b6a71571341dcd3f9e9d1a6f6355da9c, < 99e17b20fddac19a228d213e00f6b9e1c10daff9 | ≥ 2f425878b6a71571341dcd3f9e9d1a6f6355da9c, < 243f71ed873ff3feeb6f9b5cb145d63f7188b4c4 | ≥ 2f425878b6a71571341dcd3f9e9d1a6f6355da9c, < 063a6f22478ef929625000a2caf54667725c1dfd | ≥ 2f425878b6a71571341dcd3f9e9d1a6f6355da9c, < d75ec4504a4340b033b15cad0303988b3089dd93 | ≥ 2f425878b6a71571341dcd3f9e9d1a6f6355da9c, < 8dff54fe88c0dcd4c55bff9fc2fa6ca968290826 | ≥ 2f425878b6a71571341dcd3f9e9d1a6f6355da9c, < f9c206cdc4266caad6a9a7f46341420a10f03ccb | 2.6.30
  • linux_kernel≥ 2.6.30, < 5.10.252 | ≥ 5.11, < 5.15.202 | ≥ 5.16, < 6.1.165 | ≥ 6.2, < 6.6.128 | ≥ 6.7, < 6.12.75 | ≥ 6.13, < 6.18.14 | ≥ 6.19, < 6.19.4
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.18.14-1

3 vendors · 160 products

References

37 links
Show all 37 references