serial: 8250: Fix TX deadlock when using DMA

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Summary

CVECVE-2026-43061
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-05 16:16:15 UTC
Updated2026-05-29 18:24:52 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: serial: 8250: Fix TX deadlock when using DMA `dmaengine_terminate_async` does not guarantee that the `__dma_tx_complete` callback will run. The callback is currently the only place where `dma->tx_running` gets cleared. If the transaction is canceled and the callback never runs, then `dma->tx_running` will never get cleared and we will never schedule new TX DMA transactions again. This change makes it so we clear `dma->tx_running` after we terminate the DMA transaction. This is "safe" because `serial8250_tx_dma_flush` is holding the UART port lock. The first thing the callback does is also grab the UART port lock, so access to `dma->tx_running` is serialized.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-667

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7c47e637dfadfbc691dd297b91d81ef939ca2080 8190f9ab6ad90cb97652adbebd238b874a4ef70d git Not specified
CNA Linux Linux affected bf3f395b9c37956eca866c9e1679769ed7dcce68 79a19bd936bb35f56ef0ccab1b3b59ebce8c762d git Not specified
CNA Linux Linux affected d470522c597b73e63cca04f3012aec28185113b7 f76d91271bcacbd759a2e4ee3ea61faa6a727ccf git Not specified
CNA Linux Linux affected 5e00346deb7bf40a4cf70e3716ac8e9a2409eb55 d2719a0a9c3439abf67843a5504b7afccd9ded93 git Not specified
CNA Linux Linux affected c8a52c772c7c6de72257a435bcad03d3bb914a70 2a72403b985aea6b4aac3171830492f9a387f9e1 git Not specified
CNA Linux Linux affected 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 5f6b17562f03fc65c7d3474ef8f1959b19d1ca41 git Not specified
CNA Linux Linux affected 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 b5ad887339503103d0fbe9827b16ad287597c275 git Not specified
CNA Linux Linux affected 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 a424a34b8faddf97b5af41689087e7a230f79ba7 git Not specified
CNA Linux Linux affected bbec5998d7bd349730f59c959a8b00cfff816e34 git Not specified
CNA Linux Linux affected 59f751db7f392fa7a58cbd972205982f7f4f5854 git Not specified
CNA Linux Linux affected 5.10.235 5.10.253 semver Not specified
CNA Linux Linux affected 5.15.179 5.15.203 semver Not specified
CNA Linux Linux affected 6.1.129 6.1.167 semver Not specified
CNA Linux Linux affected 6.6.79 6.6.130 semver Not specified
CNA Linux Linux affected 6.12.16 6.12.78 semver Not specified
CNA Linux Linux affected 5.4.291 5.5 semver Not specified
CNA Linux Linux affected 6.13.4 6.14 semver Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/79a19bd936bb35f56ef0ccab1b3b59ebce8c762d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b5ad887339503103d0fbe9827b16ad287597c275 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a424a34b8faddf97b5af41689087e7a230f79ba7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d2719a0a9c3439abf67843a5504b7afccd9ded93 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2a72403b985aea6b4aac3171830492f9a387f9e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8190f9ab6ad90cb97652adbebd238b874a4ef70d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f76d91271bcacbd759a2e4ee3ea61faa6a727ccf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5f6b17562f03fc65c7d3474ef8f1959b19d1ca41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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