Linux Kernel up to 6.18.21/6.19.11 crypto algif_aead Copy Fail resource transfer

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.74

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.21/6.19.11. It has been declared as critical. This affects the function algif_aead of the component crypto. Such manipulation leads to resource transfer. This vulnerability is traded as CVE-2026-31431. An attack has to be approached locally. Furthermore, there is an exploit available. This vulnerability has a historic impact due to its background and reception. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.21/6.19.11. It has been rated as critical. Affected by this issue is the function algif_aead of the component crypto. The manipulation with an unknown input leads to a resource transfer vulnerability. Using CWE to declare the problem leads to CWE-669. The product does not properly transfer a resource/behavior to another sphere, or improperly imports a resource/behavior from another sphere, in a manner that provides unintended control over that resource. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This mostly reverts commit 72548b093ee3 except for the copying of the associated data. There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-31431 since 03/09/2026. The exploitation is known to be easy. The attack needs to be approached locally. Technical details as well as a public exploit are known. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/18/2026). This vulnerability has a historic impact due to its background and reception.

A public exploit has been developed by junorouse in Python. The exploit is available at github.com. It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 309203 (Linux Distros Unpatched Vulnerability : CVE-2026-31431), which helps to determine the existence of the flaw in a target environment. This issue was added on 05/01/2026 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 05/15/2026:

"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Upgrading to version 6.18.22 or 6.19.12 eliminates this vulnerability. Applying the patch fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8/ce42ee423e58dffa5ec03524054c9d8bfd4f6237/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 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 (309203), EUVD (EUVD-2026-24639) and CERT Bund (WID-SEC-2026-1232). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • LANCOM LCOS
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Docker Desktop

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: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
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: Resource transfer
CWE: CWE-669
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Attacked
Author: junorouse
Programming Language: 🔒
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

KEV Added: 🔒
KEV Due: 🔒
KEV Remediation: 🔒
KEV Ransomware: 🔒
KEV Notice: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 309203
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31431

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒
Exploit Delay Time: 🔍

Upgrade: Kernel 6.18.22/6.19.12
Patch: fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8/ce42ee423e58dffa5ec03524054c9d8bfd4f6237/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5

Timelineinfo

03/09/2026 CVE reserved
04/22/2026 +43 days Advisory disclosed
04/22/2026 +0 days VulDB entry created
04/29/2026 +6 days Exploit disclosed
05/18/2026 +19 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31431 (🔒)
GCVE (CVE): GCVE-0-2026-31431
GCVE (VulDB): GCVE-100-358784
EUVD: 🔒
CERT Bund: WID-SEC-2026-1232 - Linux Kernel: Mehrere Schwachstellen

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 04/22/2026 12:02
Updated: 05/18/2026 22:16
Changes: 04/22/2026 12:02 (58), 04/23/2026 07:51 (2), 04/30/2026 06:26 (1), 04/30/2026 08:02 (10), 04/30/2026 08:03 (4), 04/30/2026 08:05 (5), 04/30/2026 08:14 (29), 05/01/2026 22:15 (16), 05/07/2026 13:43 (1), 05/18/2026 22:16 (10)
Complete: 🔍
Committer: misc
Cache ID: 216::103

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

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