Linux Kernel up to 7.1.7 io_uring __io_uring_free privileges management

Summaryinfo

A vulnerability identified as very critical has been detected in Linux Kernel up to 7.1.7. Impacted is the function __io_uring_free of the component io_uring. This manipulation causes privileges management. This vulnerability appears as CVE-2026-80713. The attack requires local access. There is no available exploit.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 7.1.7 and classified as very critical. Affected by this vulnerability is the function __io_uring_free of the component io_uring. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: io_uring: preserve task restrictions across exec Per-task restrictions apply to all rings created by a task. Once installed, they should not be dropped across exec. For a task that has used io_uring, the exec cancellation path calls __io_uring_free(). This frees both the task context and the per-task restriction, so a ring created after exec is unrestricted. Split task context cleanup into io_uring_free_tctx(), and use it from the exec cancellation path. Keep __io_uring_free() for final task cleanup, where both the context and restriction are released.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-80713 since 08/26/2026. The exploitation appears to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/28/2026). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 7.1.8 eliminates this vulnerability. Applying the patch fcef9325afeecced693a7438e975e4a3f8e2716f/bc0e8faf90e776a2f1f3967a04e8091e6bdb4977 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

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