CVE-2026-43149 net: wan/fsl_ucc_hdlc: Fix dma_free_coherent() in uhdlc_memclean()

What is CVE-2026-43149?

CVE-2026-43149 is a medium-severity memory corruption vulnerability in Linux kernel, published on 6 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Which versions are affected by CVE-2026-43149?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43149?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-43149 being exploited?

There is no known exploitation of CVE-2026-43149 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-43149, DEBIAN-CVE-2026-43149, GHSA-c68r-r9r9-c6jp, ROOT-OS-DEBIAN-11-CVE-2026-43149, ROOT-OS-UBUNTU-2204-CVE-2026-43149, ROOT-OS-UBUNTU-2404-CVE-2026-43149 and 1 more.