HOMEVULNERABILITIESCVE-2026-43178
HIGH

CVE-2026-43178

Published: May 6, 2026· Updated: May 12, 2026

7.8
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:4.7th

Official Description

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

procfs: fix possible double mmput() in do_procmap_query()

When user provides incorrectly sized buffer for build ID for PROCMAP_QUERY

we return with -ENAMETOOLONG error. After recent changes this condition

happens later, after we unlocked mmap_lock/per-VMA lock and did mmput(),

so original goto out is now wrong and will double-mmput() mm_struct. Fix

by jumping further to clean up only vm_file and name_buf.

NVD Source

Technical Analysis

CVE-2026-43178 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

Linux1 product
linux kernel
Source: NVD CPE · 2 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
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3
PATCHhttps://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94d
PATCHhttps://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2f
PATCHhttps://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaa

All References (4)

→
https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3Patch
→
https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94dPatch
→
https://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2fPatch
→
https://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaaPatch

Quick Facts

CVE IDCVE-2026-43178
CVSS Score7.8 / 10
SeverityHIGH
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMay 6, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-43178 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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