CVE-2023-54264Public exploit

Kernel crash via unchecked sb_getblk failure

Published Dec 30, 2025 · Updated Dec 30, 2025

NULL-pointer dereference in Linux kernel SysV filesystems allows attackers to crash affected systems during block allocation. In alloc_branch(), sb_getblk() can return NULL, but the code passes that pointer to lock_buffer() without checking the allocation result. The failure path requires a SysV inode branch allocation and an sb_getblk() failure; published sources do not establish the privileges needed to reach it.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
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 SysV filesystems allows attackers to crash affected systems during block allocation. In alloc_branch(), sb_getblk() can return NULL, but the code passes that pointer to lock_buffer() without checking the allocation result. The failure path requires a SysV inode branch allocation and an sb_getblk() failure; published sources do not establish the privileges needed to reach it.

The record

CVE
CVE-2023-54264
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0a44ceba77c3267f8505dda102a59367dc24caee
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1416eebaad80bdc85ad9f97f27242011b031e2a9
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7f740bc696d4617f8ee44565e8ac0d36278a1e91
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <afd9a31b5aa4b3747f382d44a7b03b7b5d0b7635
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <baa60c66a310c50785289b0ede6fdce8ec3219c7
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e28f376dd8dfcc4e880ac101184132bc08703f6e
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e976988bc245ec3768cc0f76bed7d05488a7dd0f
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ea2b62f305893992156a798f665847e0663c9f41

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0a44ceba77c3267f8505dda102a59367dc24caee; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1416eebaad80bdc85ad9f97f27242011b031e2a9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7f740bc696d4617f8ee44565e8ac0d36278a1e91; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <afd9a31b5aa4b3747f382d44a7b03b7b5d0b7635; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <baa60c66a310c50785289b0ede6fdce8ec3219c7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e28f376dd8dfcc4e880ac101184132bc08703f6e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e976988bc245ec3768cc0f76bed7d05488a7dd0f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ea2b62f305893992156a798f665847e0663c9f41

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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