tokio-rs slab up to 0.4.10 get_disjoint_mut memory corruption

Summaryinfo

A vulnerability marked as critical has been reported in tokio-rs slab up to 0.4.10. Affected is the function get_disjoint_mut. The manipulation leads to memory corruption. This vulnerability is referenced as CVE-2025-55159. The attack can only be performed from a local environment. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in tokio-rs slab up to 0.4.10 and classified as problematic. This issue affects the function get_disjoint_mut. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality. The summary by CVE is:

slab is a pre-allocated storage for a uniform data type. In version 0.4.10, the get_disjoint_mut method incorrectly checked if indices were within the slab's capacity instead of its length, allowing access to uninitialized memory. This could lead to undefined behavior or potential crashes. This has been fixed in slab 0.4.11. A workaround for this issue involves to avoid using get_disjoint_mut with indices that might be beyond the slab's actual length.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2025-55159 since 08/07/2025. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 254420 (Fedora 41 : rust-slab (2025-92719fd556)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.4.11 eliminates this vulnerability. Applying the patch 2d65c514bc964b192bab212ddf3c1fcea4ae96b8 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (254420). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• tokio-rs

Name

• slab

Version

• 0.4.0
• 0.4.1
• 0.4.2
• 0.4.3
• 0.4.4
• 0.4.5
• 0.4.6
• 0.4.7
• 0.4.8
• 0.4.9
• 0.4.10

License

• open-source

Website

• Product: https://github.com/tokio-rs/slab/

CPE 2.3info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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