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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9 cve-icon cve-icon
https://git.kernel.org/stable/c/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72 cve-icon cve-icon
https://git.kernel.org/stable/c/6c55714c931051cd7f4839c19ce0867179fd22fe cve-icon cve-icon
https://git.kernel.org/stable/c/716c546e88cfe49d841658240e10cb57bc50a2cc cve-icon cve-icon
https://git.kernel.org/stable/c/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4 cve-icon cve-icon
https://git.kernel.org/stable/c/d27c02eec529f78055a46a5c9e6c62684382b2d8 cve-icon cve-icon
https://git.kernel.org/stable/c/e0c8542c3d097ed4205ded51868195d5d6ddac62 cve-icon cve-icon
https://git.kernel.org/stable/c/ff5ee507302303b15859753c3e0d67d38fd12c88 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2026042407-CVE-2026-31671-c4b9@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-31671 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-31671 cve-icon
History

Sat, 25 Apr 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-908
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Fri, 24 Apr 2026 15:00:00 +0000

Type Values Removed Values Added
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.
Title xfrm_user: fix info leak in build_report()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-04-25T05:48:30.115Z

Reserved: 2026-03-09T15:48:24.130Z

Link: CVE-2026-31671

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-24T15:16:46.903

Modified: 2026-04-24T17:51:40.810

Link: CVE-2026-31671

cve-icon Redhat

Severity : Low

Publid Date: 2026-04-24T00:00:00Z

Links: CVE-2026-31671 - Bugzilla