Advisory [CVE-2026-64234] add check for dma_alloc_coherent
This security Red Hat Linux advisory covers CVE-2026-64234.
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Summary
In the Linux kernel, the following vulnerability has been resolved: tty: serial: pch_uart: add check for dma_alloc_coherent() Add a check for dma_alloc_coherent() failure to prevent a potential NULL pointer dereference in dma_handle_rx(). Properly release DMA channels and the PCI device reference using a goto ladder if the allocation fails.
A flaw was found in the Linux kernel's `tty` subsystem, specifically within the `pch_uart` serial driver. This vulnerability occurs due to a missing check for the return value of `dma_alloc_coherent()`.
An attacker could potentially exploit this to trigger a NULL pointer dereference in the `dma_handle_rx()` function, leading to a system crash and a Denial of Service (DoS). Red Hat severity: not rated.
Weakness: CWE-476. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 12 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 12 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 12 days ago·verify at source
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