HOMEVULNERABILITIESCVE-2026-43239
HIGH

CVE-2026-43239

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

8.8
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:4.9th

Official Description

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

smb: client: prevent races in ->query_interfaces()

It was possible for two query interface works to be concurrently trying

to update the interfaces.

Prevent this by checking and updating iface_last_update under

iface_lock.

NVD Source

Technical Analysis

CVE-2026-43239 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

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 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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/6287eefaf21ec805d42f941bd368018cf397a7f5
PATCHhttps://git.kernel.org/stable/c/76cc4faba0343c6db945b8dc75425b33d633e1b8
PATCHhttps://git.kernel.org/stable/c/93e8e3ee165ae4609a1222b516b573837103d2c3
PATCHhttps://git.kernel.org/stable/c/ab6564f416a6eaf1199200b6100952407b438f7d
PATCHhttps://git.kernel.org/stable/c/c3c06e42e1527716c54f3ad2ced6a034b5f3a489

All References (5)

→
https://git.kernel.org/stable/c/6287eefaf21ec805d42f941bd368018cf397a7f5Patch
→
https://git.kernel.org/stable/c/76cc4faba0343c6db945b8dc75425b33d633e1b8Patch
→
https://git.kernel.org/stable/c/93e8e3ee165ae4609a1222b516b573837103d2c3Patch
→
https://git.kernel.org/stable/c/ab6564f416a6eaf1199200b6100952407b438f7dPatch
→
https://git.kernel.org/stable/c/c3c06e42e1527716c54f3ad2ced6a034b5f3a489Patch

Quick Facts

CVE IDCVE-2026-43239
CVSS Score8.8 / 10
SeverityHIGH
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMay 6, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-43239 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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