Linux Kernel up to 6.19.11 vxlan vxlan_na_create privilege escalation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.19.11. Affected by this vulnerability is the function vxlan_na_create of the component vxlan. The manipulation results in an unknown weakness. This vulnerability is cataloged as CVE-2026-31738. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.19.11. Affected is the function vxlan_na_create of the component vxlan. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: vxlan: validate ND option lengths in vxlan_na_create vxlan_na_create() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-31738 since 03/09/2026. 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 07/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 316948 (Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1746)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22 or 6.19.12 eliminates this vulnerability. Applying the patch 901c1dd3bab2955d7e664f914c374c8c3ac2b958/e476745917a1e288eb15e7ff49d286a86a4861d3/2029712fb2c87e9a8c75094906f2ee29bf08c500/602596c69a70e50d9ab8c6ae0290a01f88229dd7/de20d2e3b9179d132f5f5b44e490d7c916c6321b/eddfce70a6f3107d1679b0c2fcbeb96b593bd679/b69c4236255bd8de16cd876e58c6f0867d1d78b1/afa9a05e6c4971bd5586f1b304e14d61fb3d9385 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 (316948) and CERT Bund (WID-SEC-2026-1346). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

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

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
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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Nessus ID: 316948
Nessus Name: Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1746)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.253/5.15.203/6.1.168/6.6.134/6.12.81/6.18.22/6.19.12
Patch: 901c1dd3bab2955d7e664f914c374c8c3ac2b958/e476745917a1e288eb15e7ff49d286a86a4861d3/2029712fb2c87e9a8c75094906f2ee29bf08c500/602596c69a70e50d9ab8c6ae0290a01f88229dd7/de20d2e3b9179d132f5f5b44e490d7c916c6321b/eddfce70a6f3107d1679b0c2fcbeb96b593bd679/b69c4236255bd8de16cd876e58c6f0867d1d78b1/afa9a05e6c4971bd5586f1b304e14d61fb3d9385

Timelineinfo

03/09/2026 CVE reserved
05/01/2026 +52 days Advisory disclosed
05/01/2026 +0 days VulDB entry created
07/01/2026 +61 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31738 (🔒)
GCVE (CVE): GCVE-0-2026-31738
GCVE (VulDB): GCVE-100-360624
CERT Bund: WID-SEC-2026-1346 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 05/01/2026 17:00
Updated: 07/01/2026 04:43
Changes: 05/01/2026 17:00 (58), 05/05/2026 09:55 (7), 05/28/2026 05:51 (2), 07/01/2026 04:43 (3)
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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