HOMEVULNERABILITIESCVE-2026-31608
CRITICAL

CVE-2026-31608

Published: April 24, 2026· Updated: Apr 29, 2026

9.8
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:4.6th

Official Description

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

smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()

smb_direct_flush_send_list() already calls smb_direct_free_sendmsg(),

so we should not call it again after post_sendmsg()

moved it to the batch list.

NVD Source

Technical Analysis

CVE-2026-31608 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

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 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://git.kernel.org/stable/c/2ba03f46132b0d1a7bafb86e1ef61951a2254023
PATCHhttps://git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25
PATCHhttps://git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032
PATCHhttps://git.kernel.org/stable/c/84ff995ae826aa6bbcc6c7b9ea569ff67c021d72

All References (4)

→
https://git.kernel.org/stable/c/2ba03f46132b0d1a7bafb86e1ef61951a2254023Patch
→
https://git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25Patch
→
https://git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032Patch
→
https://git.kernel.org/stable/c/84ff995ae826aa6bbcc6c7b9ea569ff67c021d72Patch

Quick Facts

CVE IDCVE-2026-31608
CVSS Score9.8 / 10
SeverityCRITICAL
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedApr 24, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-31608 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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