Linux Kernel up to 6.18.10/6.19.0 smb send_done privilege escalation

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.18.10/6.19.0. Affected by this issue is the function send_done of the component smb. Executing a manipulation can lead to an unknown weakness. This vulnerability appears as CVE-2026-31534. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.18.10/6.19.0 and classified as critical. This vulnerability affects the function send_done of the component smb. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: smb: client: 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 available at git.kernel.org. This vulnerability was named CVE-2026-31534 since 03/09/2026. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/26/2026).

Upgrading to version 6.18.11 or 6.19.1 eliminates this vulnerability. Applying the patch 16c8be3d55441287ddd334e25df4cc376450dec9/86d9742c3f7ed7eba677517c80b4597822750e65/cf74fcdc43b322b6188a0750b5ee79e38be6d078 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 vulnerability database at EUVD (EUVD-2026-25426). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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 best quality of vulnerability data, you may have to visit VulDB.

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