serial: qcom-geni: do not advance stale DMA completions

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93123
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:07 UTC
Updated2026-09-17 17:18:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: serial: qcom-geni: do not advance stale DMA completions The qcom GENI serial DMA TX completion path advances the transmit fifo by the number of bytes recorded in port->tx_remaining. If uart_flush_buffer() runs after the hardware has completed a DMA transfer but before the DMA completion interrupt has been handled, the serial core resets the transmit fifo while port->tx_remaining still describes the old DMA transfer. A previous fix avoided advancing an empty fifo by checking that the fifo length is at least tx_remaining. That still does not distinguish the old DMA payload from new bytes written after the flush. If userspace writes new data before the stale DMA completion interrupt is handled, the fifo can again contain at least tx_remaining bytes and the stale completion can advance and discard those new bytes. Mark an in-flight DMA transfer stale when the transmit fifo is flushed. The later completion still unprepares the original DMA mapping using the saved length, but it no longer advances the transmit fifo.

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.101980000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2aaa43c7077833301c237684cd7bc9ae5e3dec95 231c84fe7ec40e4a06c398c0591d5b8e823d68e1 git Not specified
CNA Linux Linux affected 2aaa43c7077833301c237684cd7bc9ae5e3dec95 c02d030747c46da33faf406dd772ef91100efa27 git Not specified
CNA Linux Linux affected 2aaa43c7077833301c237684cd7bc9ae5e3dec95 59faa59c25a0a098fbc86275408d7c8405015702 git Not specified
CNA Linux Linux affected 2aaa43c7077833301c237684cd7bc9ae5e3dec95 7ea38c49e7178960926657863299face6dc0e1b0 git Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/59faa59c25a0a098fbc86275408d7c8405015702 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/231c84fe7ec40e4a06c398c0591d5b8e823d68e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c02d030747c46da33faf406dd772ef91100efa27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7ea38c49e7178960926657863299face6dc0e1b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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