Bug 2525479 (CVE-2026-80645)

Summary: CVE-2026-80645 kernel: rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's rapidio/tsi721 component. This vulnerability arises from incorrect handling of a variable within a specific loop in the `tsi721_db_dpc()` function. If a particular item is not found, the system attempts to access invalid memory. This could allow a local attacker to trigger a system crash, leading to a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-08-28 07:47:06 UTC 
In the Linux kernel, the following vulnerability has been resolved:

rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()

With a list_for_each() loop, if we don't find the item we are looking for
in the list, then the loop exits with the iterator, which is "dbell" in
this loop, pointing to invalid memory.

This code uses the "found" variable to determine if we have found the
doorbell we are looking for or not.  However, the problem that the "found"
variable needs to be set to false at the start of each iteration,
otherwise after the first correct doorbell, then everything is marked as
found.

Reset the "found" to false at the start of the iteration and move the
variable inside the loop.
Comment 1 gkamathe 2026-08-31 14:16:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082842-CVE-2026-80645-65e4@gregkh/T