Bug 2439846 (CVE-2026-23133)

Summary: CVE-2026-23133 kernel: Linux kernel: Memory management flaw in ath10k Wi-Fi driver can lead to denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's ath10k Wi-Fi driver. This memory management bug occurs during the copy engine ring teardown process, where the driver incorrectly frees Direct Memory Access (DMA) coherent buffers. A local attacker with low privileges could exploit this by triggering the flawed teardown, potentially leading to memory leaks, resource exhaustion, and system instability, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-02-14 16:01:28 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: ath10k: fix dma_free_coherent() pointer

dma_alloc_coherent() allocates a DMA mapped buffer and stores the
addresses in XXX_unaligned fields.  Those should be reused when freeing
the buffer rather than the aligned addresses.
Comment 1 Alexander B 2026-02-16 09:00:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021437-CVE-2026-23133-19ce@gregkh/T