Linux Kernel up to 6.19.8 privilege escalation

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.19.8. It has been classified as problematic. The impacted element is an unknown function. Performing a manipulation results in an unknown weakness. This vulnerability is known as CVE-2026-43383. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.19.8. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-43383 since 05/01/2026. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/28/2026).

The vulnerability scanner Nessus provides a plugin with the ID 325425 (Ubuntu 24.04 LTS : Linux kernel (NVIDIA) vulnerabilities (USN-8508-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.253, 6.1.167, 6.6.130, 6.12.78, 6.18.19 or 6.19.9 eliminates this vulnerability. Applying the patch 821c8751fdeecdeecabeb11704dd33439c9e4bbc/345a9530756528d7ca407663d659c3c40e75c3dd/5d305a95130a8d08b9545e47f1e18d29d59866cb/ae3831b44f477de048287493e184fc3ff913b624/b502e97e29d791ff7a8051f29a414535739be218/46d0d6f50dab706637f4c18a470aac20a21900d3 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 (325425) and CERT Bund (WID-SEC-2026-1454). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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
  • Red Hat OpenShift
  • Microsoft Azure Linux
  • Open Source Linux Kernel
  • Proxmox Virtual Environment

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.3

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

CNA Base Score: 9.4
CNA Vector (Linux): 🔒

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: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 325425
Nessus Name: Ubuntu 24.04 LTS : Linux kernel (NVIDIA) vulnerabilities (USN-8508-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.253/6.1.167/6.6.130/6.12.78/6.18.19/6.19.9
Patch: 821c8751fdeecdeecabeb11704dd33439c9e4bbc/345a9530756528d7ca407663d659c3c40e75c3dd/5d305a95130a8d08b9545e47f1e18d29d59866cb/ae3831b44f477de048287493e184fc3ff913b624/b502e97e29d791ff7a8051f29a414535739be218/46d0d6f50dab706637f4c18a470aac20a21900d3

Timelineinfo

05/01/2026 CVE reserved
05/08/2026 +7 days Advisory disclosed
05/08/2026 +0 days VulDB entry created
07/28/2026 +81 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43383 (🔒)
GCVE (CVE): GCVE-0-2026-43383
GCVE (VulDB): GCVE-100-362325
CERT Bund: WID-SEC-2026-1454 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 05/08/2026 18:53
Updated: 07/28/2026 12:22
Changes: 05/08/2026 18:53 (55), 05/27/2026 10:58 (11), 07/08/2026 13:17 (2), 07/28/2026 12:22 (9)
Complete: 🔍
Cache ID: 216::103

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