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CVE-2026-43061— serial: 8250: Fix TX deadlock when using DMA

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于8250串口DMA传输取消时未清除tx_running标志，可能导致TX DMA事务无法再次调度。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 27

VendorProduct Version RangeStatus
Linux Linux 7c47e637dfadfbc691dd297b91d81ef939ca2080< 8190f9ab6ad90cb97652adbebd238b874a4ef70d affected
bf3f395b9c37956eca866c9e1679769ed7dcce68< 79a19bd936bb35f56ef0ccab1b3b59ebce8c762d affected
d470522c597b73e63cca04f3012aec28185113b7< f76d91271bcacbd759a2e4ee3ea61faa6a727ccf affected
5e00346deb7bf40a4cf70e3716ac8e9a2409eb55< d2719a0a9c3439abf67843a5504b7afccd9ded93 affected
c8a52c772c7c6de72257a435bcad03d3bb914a70< 2a72403b985aea6b4aac3171830492f9a387f9e1 affected
9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583< 5f6b17562f03fc65c7d3474ef8f1959b19d1ca41 affected
9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583< b5ad887339503103d0fbe9827b16ad287597c275 affected
9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583< a424a34b8faddf97b5af41689087e7a230f79ba7 affected
… +19 more rows
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I. Basic Information for CVE-2026-43061

Vulnerability Information
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Vulnerability Title
serial: 8250: Fix TX deadlock when using DMA
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于8250串口DMA传输取消时未清除tx_running标志，可能导致TX DMA事务无法再次调度。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 7c47e637dfadfbc691dd297b91d81ef939ca2080 ~ 8190f9ab6ad90cb97652adbebd238b874a4ef70d -
Linux Linux 6.14 -

II. Public POCs for CVE-2026-43061

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III. Intelligence Information for CVE-2026-43061

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Patches & Fixes for CVE-2026-43061 (8)

Same Patch Batch · Linux · 2026-05-05 · 15 CVEs total

CVE-2026-43067 9.8 CRITICAL ext4: handle wraparound when searching for blocks for indirect mapped blocks
CVE-2026-43071 9.1 CRITICAL dcache: Limit the minimal number of bucket to two
CVE-2026-43070 7.8 HIGH bpf: Reset register ID for BPF_END value tracking
CVE-2026-43063 7.8 HIGH xfs: don't irele after failing to iget in xfs_attri_recover_work
CVE-2026-43060 7.8 HIGH netfilter: nft_ct: drop pending enqueued packets on removal
CVE-2026-43062 7.1 HIGH Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()
CVE-2026-43073 x86-64: rename misleadingly named '__copy_user_nocache()' function
CVE-2026-43072 drm/vc4: platform_get_irq_byname() returns an int
CVE-2026-43069 Bluetooth: hci_ll: Fix firmware leak on error path
CVE-2026-43068 ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal()
CVE-2026-43066 ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths
CVE-2026-43065 ext4: always drain queued discard work in ext4_mb_release()
CVE-2026-43064 dmaengine: idxd: Fix not releasing workqueue on .release()
CVE-2026-43059 Bluetooth: MGMT: Fix list corruption and UAF in command complete handlers

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43061

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