Bug 2334423 (CVE-2024-53206)

Summary: CVE-2024-53206 kernel: tcp: Fix use-after-free of nreq in reqsk_timer_handler().
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A use-after-free vulnerability was found in the reqsk_timer_handler() function in the Linux kernel's TCP component. This issue occurs when an incorrect request object is passed during cleanup after a retry attempt fails, where a timeout leads to denial of service.
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Description OSIDB Bzimport 2024-12-27 14:06:01 UTC 
In the Linux kernel, the following vulnerability has been resolved:

tcp: Fix use-after-free of nreq in reqsk_timer_handler().

The cited commit replaced inet_csk_reqsk_queue_drop_and_put() with
__inet_csk_reqsk_queue_drop() and reqsk_put() in reqsk_timer_handler().

Then, oreq should be passed to reqsk_put() instead of req; otherwise
use-after-free of nreq could happen when reqsk is migrated but the
retry attempt failed (e.g. due to timeout).

Let's pass oreq to reqsk_put().
Comment 1 Avinash Hanwate 2024-12-28 09:44:20 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024122728-CVE-2024-53206-d85d@gregkh/T