CVE-2023-54276

Kernel oops via uninitialized NFSD statistics counters

Published Dec 30, 2025 · Updated Dec 30, 2025

NULL pointer dereference in Linux kernel 6.3 allows local users to trigger a kernel oops by reading the NFSD reply-cache statistics file. The nfsd_reply_cache_stats_show path applies this_cpu_ptr to reply_cache_stats before its per-CPU storage is initialized, producing a NULL dereference. Triggering requires a non-x86_64 architecture, a namespace with /proc/fs/nfsd mounted, NFSD not started, and an unprivileged read of reply_cache_stats; the result is a kernel oops, not data access or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux kernel 6.3 allows local users to trigger a kernel oops by reading the NFSD reply-cache statistics file. The nfsd_reply_cache_stats_show path applies this_cpu_ptr to reply_cache_stats before its per-CPU storage is initialized, producing a NULL dereference. Triggering requires a non-x86_64 architecture, a namespace with /proc/fs/nfsd mounted, NFSD not started, and an unprivileged read of reply_cache_stats; the result is a kernel oops, not data access or code execution.

The record

CVE
CVE-2023-54276
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4e18b58b106e34ac69d3052dd91f520bd83cf2fc <3025d489f9c8984d1bf5916c4a20097ed80fca5c
  2. Affected versionversion=6.3
  3. Affected versionversion=70fdee548c036c6bdb496f284c9e78f1654b6dd0 <8549384d0f65981761fe2077d04fa2a8d37b54e0
  4. Affected versionversion=e7e571ed4ec7bb50136233d8e7b986efef2af8c1 <66a178177b2b3bb1d71e854c5e7bbb320eb0e566
  5. Affected versionversion=f5f9d4a314da88c0a5faa6d168bf69081b7a25ae <768c408594b52d8531e1a8ab62e5620c19213e73
  6. Affected versionversion=f5f9d4a314da88c0a5faa6d168bf69081b7a25ae <ed9ab7346e908496816cffdecd46932035f66e2e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4e18b58b106e34ac69d3052dd91f520bd83cf2fc <3025d489f9c8984d1bf5916c4a20097ed80fca5c; version=6.3; version=70fdee548c036c6bdb496f284c9e78f1654b6dd0 <8549384d0f65981761fe2077d04fa2a8d37b54e0; version=e7e571ed4ec7bb50136233d8e7b986efef2af8c1 <66a178177b2b3bb1d71e854c5e7bbb320eb0e566; version=f5f9d4a314da88c0a5faa6d168bf69081b7a25ae <768c408594b52d8531e1a8ab62e5620c19213e73; version=f5f9d4a314da88c0a5faa6d168bf69081b7a25ae <ed9ab7346e908496816cffdecd46932035f66e2e

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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