Linux Kernel up to 6.19.11 x25_clear_queues buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.1.167/6.6.133/6.12.80/6.18.21/6.19.11. Affected by this vulnerability is the function x25_clear_queues. Executing a manipulation can lead to buffer overflow. This vulnerability appears as CVE-2026-31417. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.1.167/6.6.133/6.12.80/6.18.21/6.19.11. This vulnerability affects the function x25_clear_queues. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix overflow when accumulating packets Add a check to ensure that `x25_sock.fraglen` does not overflow. The `fraglen` also needs to be resetted when purging `fragment_queue` in `x25_clear_queues()`.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-31417 since 03/09/2026. The exploitation appears to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/18/2026).

The vulnerability scanner Nessus provides a plugin with the ID 306181 (Linux Distros Unpatched Vulnerability : CVE-2026-31417), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.168, 6.6.134, 6.12.81, 6.18.22 or 6.19.12 eliminates this vulnerability. Applying the patch 6e568835ea54a3e1d08e310e34f95d434e739477/1734bd85c5e0a7a801295b729efb56b009cb8fc3/4e2d1bcef78d21247fe8fef13bc7ed95885df2b5/8c92969c197b91c134be27dc3afb64ab468853a9/f953f11ccf4afe6feb635c08145f4240d9a6b544/a1822cb524e89b4cd2cf0b82e484a2335496a6d9 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 (306181), EUVD (EUVD-2026-21938) and CERT Bund (WID-SEC-2026-1088). Once again VulDB remains the best source for vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Microsoft Azure Linux
  • Open Source Linux Kernel

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (Linux): 🔒

CVSSv2info

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

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 306181
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31417

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.168/6.6.134/6.12.81/6.18.22/6.19.12
Patch: 6e568835ea54a3e1d08e310e34f95d434e739477/1734bd85c5e0a7a801295b729efb56b009cb8fc3/4e2d1bcef78d21247fe8fef13bc7ed95885df2b5/8c92969c197b91c134be27dc3afb64ab468853a9/f953f11ccf4afe6feb635c08145f4240d9a6b544/a1822cb524e89b4cd2cf0b82e484a2335496a6d9

Timelineinfo

03/09/2026 CVE reserved
04/13/2026 +34 days Advisory disclosed
04/13/2026 +0 days VulDB entry created
06/18/2026 +66 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31417 (🔒)
GCVE (CVE): GCVE-0-2026-31417
GCVE (VulDB): GCVE-100-357148
EUVD: 🔒
CERT Bund: WID-SEC-2026-1088 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 04/13/2026 16:03
Updated: 06/18/2026 14:51
Changes: 04/13/2026 16:03 (58), 04/14/2026 05:40 (2), 04/14/2026 17:58 (7), 04/19/2026 17:45 (1), 05/21/2026 00:34 (10), 06/18/2026 14:51 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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