HOMEVULNERABILITIESCVE-2026-43228
MEDIUM

CVE-2026-43228

Published: May 6, 2026· Updated: May 8, 2026

5.5
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:5.0th

Official Description

In the Linux kernel, the following vulnerability has been resolved:

hfs: Replace BUG_ON with error handling for CNID count checks

In a06ec283e125 next_id, folder_count, and file_count in the super block

info were expanded to 64 bits, and BUG_ONs were added to detect

overflow. This triggered an error reported by syzbot: if the MDB is

corrupted, the BUG_ON is triggered. This patch replaces this mechanism

with proper error handling and resolves the syzbot reported bug.

Singed-off-by: Jori Koolstra <[email protected]>

NVD Source

Technical Analysis

CVE-2026-43228 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Linux1 product
linux kernel
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://git.kernel.org/stable/c/b226804532a875c10276168dc55ce752944096bd
PATCHhttps://git.kernel.org/stable/c/b6536c1ced315fa645576d3a39c6e07f2a472962

All References (2)

→
https://git.kernel.org/stable/c/b226804532a875c10276168dc55ce752944096bdPatch
→
https://git.kernel.org/stable/c/b6536c1ced315fa645576d3a39c6e07f2a472962Patch

Quick Facts

CVE IDCVE-2026-43228
CVSS Score5.5 / 10
SeverityMEDIUM
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMay 6, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-43228 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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