Linux Kernel up to 6.18.22/6.19.12 rxrpc rxrpc_preparse_xdr_yfs_rxgk memory leak

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.22/6.19.12. It has been declared as critical. This impacts the function rxrpc_preparse_xdr_yfs_rxgk of the component rxrpc. Such manipulation leads to memory leak. This vulnerability is documented as CVE-2026-31643. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.22/6.19.12 and classified as critical. Affected by this issue is the function rxrpc_preparse_xdr_yfs_rxgk of the component rxrpc. The manipulation with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix key parsing memleak In rxrpc_preparse_xdr_yfs_rxgk(), the memory attached to token->rxgk can be leaked in a few error paths after it's allocated. Fix this by freeing it in the "reject_token:" case.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-31643 since 03/09/2026. There are known technical details, but no exploit is available.

Upgrading to version 6.18.23 or 6.19.13 eliminates this vulnerability. Applying the patch d5f76f812d2c0ea6dd651b0586be49e85ecca085/01f51318feb626deee1d0c8a190198cd7857d599/b555912b9b21075e8298015f888ffe3ff60b1a97 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 vulnerability database at CERT Bund (WID-SEC-2026-1279). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Red Hat Enterprise Linux
  • Oracle 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: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.23/6.19.13
Patch: d5f76f812d2c0ea6dd651b0586be49e85ecca085/01f51318feb626deee1d0c8a190198cd7857d599/b555912b9b21075e8298015f888ffe3ff60b1a97

Timelineinfo

03/09/2026 CVE reserved
04/24/2026 +45 days Advisory disclosed
04/24/2026 +0 days VulDB entry created
05/26/2026 +32 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31643 (🔒)
GCVE (CVE): GCVE-0-2026-31643
GCVE (VulDB): GCVE-100-359456
CERT Bund: WID-SEC-2026-1279 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 04/24/2026 18:55
Updated: 05/26/2026 12:28
Changes: 04/24/2026 18:55 (59), 05/26/2026 12:28 (7)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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