serial: qcom-geni: fix TX DMA buffer flush

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74655
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:39 UTC
Updated2026-08-22 16:16:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: serial: qcom-geni: fix TX DMA buffer flush When transmit flushing a qcom-geni UART during an ongoing TX DMA, the UART gets stuck infinitely repeating corrupted TX DMA frames. The DMA-mode uart_ops does not provide a flush_buffer callback, so an in-flight transfer can complete after serial core has reset the transmit kfifo, underflowing its length and resubmitting page-sized transfers indefinitely. Add one that stops the transfer and clears tx_remaining and tx_queued. The stop path was also broken: it unmapped the buffer while the serial engine could still read it, and never reset the TX DMA state machine. Cancel the main sequencer command first, then reset the state machine and wait for it before unmapping. Drop the early return so a pending mapping is also cleaned up when the main command is inactive. The bug can be triggered from userspace with a large write immediately followed by TCOFLUSH. A following tcdrain will hang forever. The bug was reproduced and this fix was validated on Arduino Uno Q (QRB2210) using /dev/ttyHS1.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2aaa43c7077833301c237684cd7bc9ae5e3dec95 313ae287442e5e8d3f7b53b73f37d384bda072d0 git Not specified
CNA Linux Linux affected 2aaa43c7077833301c237684cd7bc9ae5e3dec95 1c31e2377f4c1bb110ca7f6e597b2253a7440c37 git Not specified
CNA Linux Linux affected 2aaa43c7077833301c237684cd7bc9ae5e3dec95 b1801c0d40f62778b613334de5840aba10a564d5 git Not specified
CNA Linux Linux affected 2aaa43c7077833301c237684cd7bc9ae5e3dec95 e3c04834ae1ab5e9cfbe8ac54ec734aa4774249d git Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/313ae287442e5e8d3f7b53b73f37d384bda072d0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1c31e2377f4c1bb110ca7f6e597b2253a7440c37 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b1801c0d40f62778b613334de5840aba10a564d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e3c04834ae1ab5e9cfbe8ac54ec734aa4774249d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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