Linux Kernel up to 6.12.82/6.18.23/6.19.13 af_unix unix_release_sock information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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5.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.12.82/6.18.23/6.19.13. This impacts the function unix_release_sock of the component af_unix. Performing a manipulation results in information disclosure. This vulnerability is reported as CVE-2026-31673. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 6.12.82/6.18.23/6.19.13. This affects the function unix_release_sock of the component af_unix. 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. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: af_unix: read UNIX_DIAG_VFS data under unix_state_lock Exact UNIX diag lookups hold a reference to the socket, but not to u->path. Meanwhile, unix_release_sock() clears u->path under unix_state_lock() and drops the path reference after unlocking. Read the inode and device numbers for UNIX_DIAG_VFS while holding unix_state_lock(), then emit the netlink attribute after dropping the lock. This keeps the VFS data stable while the reply is being built.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-31673 since 03/09/2026. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 310342 (Linux Distros Unpatched Vulnerability : CVE-2026-31673), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.83, 6.18.24 or 6.19.14 eliminates this vulnerability. Applying the patch 0c739f3785f84af695952c2bac8be2f45082c9b8/900a4e0910e98b8caef117d5df00471fa438dcf9/bdf206e740bf2919d818f132c8c9cc7ed91d11c0/39897df386376912d561d4946499379effa1e7ef 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 (310342) and EUVD (EUVD-2026-25640). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.6

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

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

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: 🔒

0-DayUnlockUnlockUnlockUnlock
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Nessus ID: 310342
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31673

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.83/6.18.24/6.19.14
Patch: 0c739f3785f84af695952c2bac8be2f45082c9b8/900a4e0910e98b8caef117d5df00471fa438dcf9/bdf206e740bf2919d818f132c8c9cc7ed91d11c0/39897df386376912d561d4946499379effa1e7ef

Timelineinfo

03/09/2026 CVE reserved
04/25/2026 +46 days Advisory disclosed
04/25/2026 +0 days VulDB entry created
06/04/2026 +40 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31673 (🔒)
GCVE (CVE): GCVE-0-2026-31673
GCVE (VulDB): GCVE-100-359577
EUVD: 🔒

Entryinfo

Created: 04/25/2026 11:32
Updated: 06/04/2026 05:06
Changes: 04/25/2026 11:32 (59), 04/25/2026 13:02 (1), 04/26/2026 05:51 (2), 06/04/2026 05:06 (11)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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