Vulnary
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Critical· 9.8official fix available

CVE-2023-54258

A race condition in the Linux kernel's CIFS implementation can cause a kernel oops (crash) when handling opportunistic lock breaks during deferred close. This vulnerability has been assigned a critical CVSS score of 9.8.

publishedDec 30, 2025
last modifiedAug 4, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
7th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Sep 3, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Linux systems using the CIFS filesystem component.

02

Real-world impact

An attacker who can trigger the race condition may cause a kernel crash, leading to denial of service or potential further exploitation.

03

Why this severity

The CVSS v3.1 base score of 9.8 (Critical) reflects high impacts to confidentiality, integrity, and availability, with low attack complexity and no privileges or user interaction required.

04

What to do about it

official fix available
recommended steps
  1. 01Update the Linux kernel to a version that includes the fix for CVE-2023-54258 (the patch that changes the ordering of checks in cifs_oplock_break before sending the oplock response).

NVD-referenced vendor advisory

05

Timeline

  1. Dec 30, 2025 · Dec 30, 2025
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Aug 4, 2026 · 1d ago
    Advisory updated
    The NVD record was last revised.
  3. Aug 4, 2026 · 1d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →