Bug 2467106 (CVE-2026-43149)

Summary: CVE-2026-43149 kernel: net: wan/fsl_ucc_hdlc: Fix dma_free_coherent() in uhdlc_memclean()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: unspecified    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's `fsl_ucc_hdlc` module. The `uhdlc_memclean()` function incorrectly deallocates memory by calling `dma_free_coherent()` twice for buffers that were allocated as a single contiguous block. This improper memory handling may lead to a denial of service (DoS) or other unpredictable system behavior due to memory corruption.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-05-06 13:04:36 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: wan/fsl_ucc_hdlc: Fix dma_free_coherent() in uhdlc_memclean()

The priv->rx_buffer and priv->tx_buffer are alloc'd together as
contiguous buffers in uhdlc_init() but freed as two buffers in
uhdlc_memclean().

Change the cleanup to only call dma_free_coherent() once on the whole
buffer.
Comment 1 Keith Grant 2026-05-06 18:47:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050627-CVE-2026-43149-cd24@gregkh/T