CVE-2026-43061

serial: 8250: Fix TX deadlock when using DMA

State: Published
Severity: Not scored
Published: May 5, 2026
Updated: May 23, 2026
Reserved: May 1, 2026

Description

In 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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	7c47e637dfadfbc691dd297b91d81ef939ca2080 to before 8190f9ab6ad90cb97652adbebd238b874a4ef70dAffected bf3f395b9c37956eca866c9e1679769ed7dcce68 to before 79a19bd936bb35f56ef0ccab1b3b59ebce8c762dAffected d470522c597b73e63cca04f3012aec28185113b7 to before f76d91271bcacbd759a2e4ee3ea61faa6a727ccfAffected 5e00346deb7bf40a4cf70e3716ac8e9a2409eb55 to before d2719a0a9c3439abf67843a5504b7afccd9ded93Affected c8a52c772c7c6de72257a435bcad03d3bb914a70 to before 2a72403b985aea6b4aac3171830492f9a387f9e1Affected 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 to before 5f6b17562f03fc65c7d3474ef8f1959b19d1ca41Affected 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 to before b5ad887339503103d0fbe9827b16ad287597c275Affected 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 to before a424a34b8faddf97b5af41689087e7a230f79ba7Affected bbec5998d7bd349730f59c959a8b00cfff816e34Affected 59f751db7f392fa7a58cbd972205982f7f4f5854Affected 5.10.235 to before 5.10.253Affected 5.15.179 to before 5.15.203Affected 6.1.129 to before 6.1.167Affected 6.6.79 to before 6.6.130Affected 6.12.16 to before 6.12.78Affected 5.4.291 to before 5.5Affected 6.13.4 to before 6.14Affected
LinuxLinux	6.14Affected before 6.14Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.167 through 6.1.Not affected 6.6.130 through 6.6.Not affected 6.12.78 through 6.12.Not affected 6.18.20 through 6.18.Not affected 6.19.10 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

7c47e637dfadfbc691dd297b91d81ef939ca2080 to before 8190f9ab6ad90cb97652adbebd238b874a4ef70dAffected
bf3f395b9c37956eca866c9e1679769ed7dcce68 to before 79a19bd936bb35f56ef0ccab1b3b59ebce8c762dAffected
d470522c597b73e63cca04f3012aec28185113b7 to before f76d91271bcacbd759a2e4ee3ea61faa6a727ccfAffected
5e00346deb7bf40a4cf70e3716ac8e9a2409eb55 to before d2719a0a9c3439abf67843a5504b7afccd9ded93Affected
c8a52c772c7c6de72257a435bcad03d3bb914a70 to before 2a72403b985aea6b4aac3171830492f9a387f9e1Affected
9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 to before 5f6b17562f03fc65c7d3474ef8f1959b19d1ca41Affected
9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 to before b5ad887339503103d0fbe9827b16ad287597c275Affected
9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 to before a424a34b8faddf97b5af41689087e7a230f79ba7Affected
bbec5998d7bd349730f59c959a8b00cfff816e34Affected
59f751db7f392fa7a58cbd972205982f7f4f5854Affected
5.10.235 to before 5.10.253Affected
5.15.179 to before 5.15.203Affected
6.1.129 to before 6.1.167Affected
6.6.79 to before 6.6.130Affected
6.12.16 to before 6.12.78Affected
5.4.291 to before 5.5Affected
6.13.4 to before 6.14Affected

LinuxLinux

6.14Affected
before 6.14Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.167 through 6.1.*Not affected
6.6.130 through 6.6.*Not affected
6.12.78 through 6.12.*Not affected
6.18.20 through 6.18.*Not affected
6.19.10 through 6.19.*Not affected
7.0 and laterNot affected

References

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