Linux Kernel up to 6.19.12 xfrm_user build_report information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.96

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.19.12. This vulnerability affects the function build_report of the component xfrm_user. The manipulation results in information disclosure. This vulnerability is reported as CVE-2026-31671. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.19.12. Affected is the function build_report of the component xfrm_user. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-31671 since 03/09/2026. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability scanner Nessus provides a plugin with the ID 321588 (SUSE SLES16 Security Update : kernel (SUSE-SU-2026:22127-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.253, 5.15.203, 6.1.169, 6.6.135, 6.12.82, 6.18.23 or 6.19.13 eliminates this vulnerability. Applying the patch d27c02eec529f78055a46a5c9e6c62684382b2d8/716c546e88cfe49d841658240e10cb57bc50a2cc/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9/e0c8542c3d097ed4205ded51868195d5d6ddac62/ff5ee507302303b15859753c3e0d67d38fd12c88/6c55714c931051cd7f4839c19ce0867179fd22fe/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (321588) and EUVD (EUVD-2026-25564). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 321588
Nessus Name: SUSE SLES16 Security Update : kernel (SUSE-SU-2026:22127-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.253/5.15.203/6.1.169/6.6.135/6.12.82/6.18.23/6.19.13
Patch: d27c02eec529f78055a46a5c9e6c62684382b2d8/716c546e88cfe49d841658240e10cb57bc50a2cc/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9/e0c8542c3d097ed4205ded51868195d5d6ddac62/ff5ee507302303b15859753c3e0d67d38fd12c88/6c55714c931051cd7f4839c19ce0867179fd22fe/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4

Timelineinfo

03/09/2026 CVE reserved
04/24/2026 +45 days Advisory disclosed
04/24/2026 +0 days VulDB entry created
07/17/2026 +84 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31671 (🔒)
GCVE (CVE): GCVE-0-2026-31671
GCVE (VulDB): GCVE-100-359472
EUVD: 🔒

Entryinfo

Created: 04/24/2026 19:01
Updated: 07/17/2026 10:03
Changes: 04/24/2026 19:01 (59), 04/24/2026 19:35 (1), 06/20/2026 17:38 (2), 07/17/2026 10:03 (11)
Complete: 🔍
Cache ID: 216::103

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