HOMEVULNERABILITIESCVE-2026-31671
MEDIUM

CVE-2026-31671

Published: April 24, 2026· Updated: Apr 27, 2026

5.5
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:1.7th

Official Description

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

xfrm_user: fix info leak in build_report()

struct xfrm_user_report is a __u8 proto field followed by a struct

xfrm_selector which means there is three "empty" bytes of padding, but

the padding is never zeroed before copying to userspace. Fix that up by

zeroing the structure before setting individual member variables.

NVD Source

Technical Analysis

CVE-2026-31671 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 · 3 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/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9
PATCHhttps://git.kernel.org/stable/c/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72
PATCHhttps://git.kernel.org/stable/c/6c55714c931051cd7f4839c19ce0867179fd22fe
PATCHhttps://git.kernel.org/stable/c/716c546e88cfe49d841658240e10cb57bc50a2cc
PATCHhttps://git.kernel.org/stable/c/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4
PATCHhttps://git.kernel.org/stable/c/d27c02eec529f78055a46a5c9e6c62684382b2d8
PATCHhttps://git.kernel.org/stable/c/e0c8542c3d097ed4205ded51868195d5d6ddac62
PATCHhttps://git.kernel.org/stable/c/ff5ee507302303b15859753c3e0d67d38fd12c88

All References (8)

→
https://git.kernel.org/stable/c/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9Patch
→
https://git.kernel.org/stable/c/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72Patch
→
https://git.kernel.org/stable/c/6c55714c931051cd7f4839c19ce0867179fd22fePatch
→
https://git.kernel.org/stable/c/716c546e88cfe49d841658240e10cb57bc50a2ccPatch
→
https://git.kernel.org/stable/c/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4Patch
→
https://git.kernel.org/stable/c/d27c02eec529f78055a46a5c9e6c62684382b2d8Patch
→
https://git.kernel.org/stable/c/e0c8542c3d097ed4205ded51868195d5d6ddac62Patch
→
https://git.kernel.org/stable/c/ff5ee507302303b15859753c3e0d67d38fd12c88Patch

Quick Facts

CVE IDCVE-2026-31671
CVSS Score5.5 / 10
SeverityMEDIUM
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedApr 24, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-31671 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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