Linux Kernel inet frags inet_frag_create race condition

Summaryinfo

A vulnerability was found in Linux Kernel. It has been declared as critical. This issue affects the function inet_frag_create of the component inet frags. Such manipulation leads to race condition. This vulnerability is uniquely identified as CVE-2026-74662. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel (version now known). It has been rated as critical. Affected by this issue is the function inet_frag_create of the component inet frags. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: inet: frags: publish queues before arming timer inet_frag_create() arms the fragment queue timer before inserting the queue into the fqdir rhashtable. If the namespace fragment timeout is zero or negative, the timer can run before the queue is published. The timer callback then marks the queue complete, tries to remove a node that is not in the hash table yet, and drops the anticipated hash reference. Creation can subsequently publish the completed queue without restoring that reference, leaving a stale hash node after the caller drops the remaining reference. Publish the queue first and arm the timer while holding the queue lock. This makes timer expiry wait until the queue is visible in the hash table, so inet_frag_kill() can remove the node and balance the hash reference.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-74662 since 08/15/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. 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 08/22/2026).

Applying the patch 9f904dd3e455750e5d4ec9b2f134835811b85a2f/928128865e43b197e30688dc1bc991592c97edcf/653d7ddf6cba867777a3d14c4f83ace008c5ad13 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

License

• open-source

Website

• Vendor: https://www.kernel.org/

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CPE 2.2info

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