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NVD / CVE Program· CNA Linux

CVE-2023-54264: fs/sysv: Null check to prevent null-ptr-deref bug

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 0a44ceba77c3267f8505dda102a59367dc24caee, 1416eebaad80bdc85ad9f97f27242011b031e2a9, 7f740bc696d4617f8ee44565e8ac0d36278a1e91.

Low priority for now. Upgrade to Linux Linux 0a44ceba77c3267f8505dda102a59367dc24caee, 1416eebaad80bdc85ad9f97f27242011b031e2a9, 7f740bc696d4617f8ee44565e8ac0d36278a1e91 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: fs/sysv: Null check to prevent null-ptr-deref bug sb_getblk(inode->i_sb, parent) return a null ptr and taking lock on that leads to the null-ptr-deref bug.

—No exploit Fix available
Published
Dec 30, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-54264

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.19affected
    • e5657933863f43cc6bb76a54d659303dafaa9e58 and later · before e976988bc245ec3768cc0f76bed7d05488a7dd0faffected · git
    • e5657933863f43cc6bb76a54d659303dafaa9e58 and later · before baa60c66a310c50785289b0ede6fdce8ec3219c7affected · git
    • e5657933863f43cc6bb76a54d659303dafaa9e58 and later · before 0a44ceba77c3267f8505dda102a59367dc24caeeaffected · git
    • e5657933863f43cc6bb76a54d659303dafaa9e58 and later · before 7f740bc696d4617f8ee44565e8ac0d36278a1e91affected · git
    • e5657933863f43cc6bb76a54d659303dafaa9e58 and later · before afd9a31b5aa4b3747f382d44a7b03b7b5d0b7635affected · git
    • e5657933863f43cc6bb76a54d659303dafaa9e58 and later · before 1416eebaad80bdc85ad9f97f27242011b031e2a9affected · git
    • e5657933863f43cc6bb76a54d659303dafaa9e58 and later · before e28f376dd8dfcc4e880ac101184132bc08703f6eaffected · git
    • e5657933863f43cc6bb76a54d659303dafaa9e58 and later · before ea2b62f305893992156a798f665847e0663c9f41affected · git
    • before 2.6.19not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.52-16.1.52-1
Debian:13linuxbefore 6.4.11-16.4.11-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-54261Dec 30, 2025 · drm/amdkfd: Add missing gfx11 MQD manager callbacks
    0Monitor
  • ← EarlierCVE-2023-54263Dec 30, 2025 · drm/nouveau/kms/nv50-: init hpd_irq_lock for PIOR DP
    0Monitor
  • Later →CVE-2023-54265Dec 30, 2025 · ipv6: Fix an uninit variable access bug in __ip6_make_skb()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0a44ceba77c3267f8505dda102a59367dc24caeeVendor (CNA)
Linux Linux1416eebaad80bdc85ad9f97f27242011b031e2a9Vendor (CNA)
Linux Linux7f740bc696d4617f8ee44565e8ac0d36278a1e91Vendor (CNA)
Linux Linuxafd9a31b5aa4b3747f382d44a7b03b7b5d0b7635Vendor (CNA)
Linux Linuxbaa60c66a310c50785289b0ede6fdce8ec3219c7Vendor (CNA)
Linux Linuxe28f376dd8dfcc4e880ac101184132bc08703f6eVendor (CNA)
Linux Linuxe976988bc245ec3768cc0f76bed7d05488a7dd0fVendor (CNA)
Linux Linuxea2b62f305893992156a798f665847e0663c9f41Vendor (CNA)
debian:linux6.1.52-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records