Linux Kernel up to 6.6.127/6.12.74/6.18.15/6.19.5 cifs 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 identified as critical has been detected in Linux Kernel up to 6.6.127/6.12.74/6.18.15/6.19.5. Impacted is an unknown function of the component cifs. The manipulation leads to an unknown weakness. This vulnerability is traded as CVE-2026-31693. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.6.127/6.12.74/6.18.15/6.19.5. This issue affects some unknown functionality of the component cifs. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: cifs: some missing initializations on replay In several places in the code, we have a label to signify the start of the code where a request can be replayed if necessary. However, some of these places were missing the necessary reinitializations of certain local variables before replay. This change makes sure that these variables get initialized after the label.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-31693 since 03/09/2026. The exploitation is known to be easy. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/30/2026).

The vulnerability scanner Nessus provides a plugin with the ID 318589 (Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-50293)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.128, 6.12.75, 6.18.16 or 6.19.6 eliminates this vulnerability. Applying the patch c854ab481ece4b3e5f4c2e8b22824f015ff874a5/1d731e512134495e0ef490ade0e4d91dc0d515ec/7c9ce68192eef14c777cb6ce17155d2eb2431aea/c99e160938b627f6f28edee930e8abc157e84386/14f66f44646333d2bfd7ece36585874fd72f8286 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 (318589) and CERT Bund (WID-SEC-2026-1346). Statistical analysis made it clear that VulDB provides the best quality 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
  • 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: 318589
Nessus Name: Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-50293)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.128/6.12.75/6.18.16/6.19.6
Patch: c854ab481ece4b3e5f4c2e8b22824f015ff874a5/1d731e512134495e0ef490ade0e4d91dc0d515ec/7c9ce68192eef14c777cb6ce17155d2eb2431aea/c99e160938b627f6f28edee930e8abc157e84386/14f66f44646333d2bfd7ece36585874fd72f8286

Timelineinfo

03/09/2026 CVE reserved
04/30/2026 +51 days Advisory disclosed
04/30/2026 +0 days VulDB entry created
06/30/2026 +61 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31693 (🔒)
GCVE (CVE): GCVE-0-2026-31693
GCVE (VulDB): GCVE-100-360299
CERT Bund: WID-SEC-2026-1346 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 04/30/2026 16:22
Updated: 06/30/2026 19:47
Changes: 04/30/2026 16:22 (57), 05/04/2026 14:10 (7), 06/04/2026 14:28 (2), 06/09/2026 02:57 (1), 06/22/2026 04:33 (1), 06/30/2026 19:47 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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