Bug 2454855 (CVE-2026-31391)

Summary: CVE-2026-31391 kernel: crypto: atmel-sha204a - Fix OOM ->tfm_count leak
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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A flaw was found in the Linux kernel's atmel-sha204a component. This issue arises when the system attempts to allocate memory, and that allocation fails. If not properly handled, a resource counter, `tfm_count`, is not correctly decremented, leading to a resource leak. This can be exploited by a local user or process to prevent future read operations, effectively causing a Denial of Service (DoS) by making the system unresponsive to certain requests.
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Description OSIDB Bzimport 2026-04-03 16:04:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

crypto: atmel-sha204a - Fix OOM ->tfm_count leak

If memory allocation fails, decrement ->tfm_count to avoid blocking
future reads.
Comment 1 Jon Moroney 2026-04-03 17:30:31 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026040324-CVE-2026-31391-4b86@gregkh/T