Linux Kernel up to 6.18.10/6.19.0 smb send_done privilege escalation

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.18.10/6.19.0 and classified as critical. This issue affects the function send_done of the component smb. This manipulation causes an unknown weakness. This vulnerability is handled as CVE-2026-31536. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.10/6.19.0. It has been declared as critical. Affected by this vulnerability is the function send_done of the component smb. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: smb: server: let send_done handle a completion without IB_SEND_SIGNALED With smbdirect_send_batch processing we likely have requests without IB_SEND_SIGNALED, which will be destroyed in the final request that has IB_SEND_SIGNALED set. If the connection is broken all requests are signaled even without explicit IB_SEND_SIGNALED.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-31536 since 03/09/2026. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/14/2026).

The vulnerability scanner Nessus provides a plugin with the ID 310299 (Linux Distros Unpatched Vulnerability : CVE-2026-31536), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.11 or 6.19.1 eliminates this vulnerability. Applying the patch 24082642654f3e5149913946e89c00a297a8868f/e38b415c024bc3b6321bf8650dbf3f4aab8e74b3/9da82dc73cb03e85d716a2609364572367a5ff47 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 (310299) and CERT Bund (WID-SEC-2026-1279). 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
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Open Source Linux Kernel
• Siemens SIMATIC S7

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8
• 6.9
• 6.10
• 6.11
• 6.12
• 6.13
• 6.14
• 6.15
• 6.16
• 6.17
• 6.18
• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.19.0

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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