serial: 8250: Fix TX deadlock when using DMA
Priority LOW 23CWE-667Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-667 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00091 0th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.253, 5.15.203, 6.1.167 +7Red Hat: 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.10.235 to before 5.10.253; 5.15.179 to before 5.15.203; 6.1.129 to before 6.1.167; 6.6.79 to before 6.6.130; 6.12.16 to before 6.12.78; 5.4.291 to before 5.5; 6.13.4 to before 6.14 | 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 5.5, 6.14 | Patch available | CNA |
| Linux | Linux | 6.14 and later | 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10, 7.0 | Patch available | CNA |
- Linux VendorLinux Affected 5.10.235 to before 5.10.253; 5.15.179 to before 5.15.203; 6.1.129 to before 6.1.167; 6.6.79 to before 6.6.130; 6.12.16 to before 6.12.78; 5.4.291 to before 5.5; 6.13.4 to before 6.14 Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 5.5, 6.14 Patch available CNA
- Linux VendorLinux Affected 6.14 and later Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10, 7.0 Patch available CNA
CPE configurations NVD · 14
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.4.291 to before 5.5; 5.10.235 to before 5.10.253; 5.15.179 to before 5.15.203; 6.1.129 to before 6.1.167; 6.6.79 to before 6.6.130; 6.12.16 to before 6.12.78; 6.13.4 to before 6.14; 6.14.1 to before 6.18.20; 6.19 to before 6.19.10 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.14:-:*:*:*:*:*:* | 6.14 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* | 6.14 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* | 6.14 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:* | 6.14 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:* | 6.14 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.14:rc7:*:*:*:*:*:* | 6.14 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* | 7.0 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* | 7.0 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* | 7.0 rc3 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.4.291 to before 5.5; 5.10.235 to before 5.10.253; 5.15.179 to before 5.15.203; 6.1.129 to before 6.1.167; 6.6.79 to before 6.6.130; 6.12.16 to before 6.12.78; 6.13.4 to before 6.14; 6.14.1 to before 6.18.20; 6.19 to before 6.19.10 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.14:-:*:*:*:*:*:* Versions 6.14 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* Versions 6.14 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* Versions 6.14 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:* Versions 6.14 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:* Versions 6.14 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.14:rc7:*:*:*:*:*:* Versions 6.14 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* Versions 7.0 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* Versions 7.0 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* Versions 7.0 rc3 Vulnerable ·Linux
Show 4 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* | 7.0 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* | 7.0 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* | 7.0 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:* | 7.0 rc7 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* Versions 7.0 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* Versions 7.0 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* Versions 7.0 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:* Versions 7.0 rc7 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 5.5, 6.14
- Fix · CNA Linux (Linux) Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10, 7.0
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-43061
- 2026-10-03 Alias added: GHSA-6grr-36f8-j7pv
- 2026-10-29 Affected versions changed · Red Hat
- 2026-11-06 CISA SSVC decision points changed
References
Patch 8
- https://git.kernel.org/stable/c/8190f9ab6ad90cb97652adbebd238b874a4ef70d
- https://git.kernel.org/stable/c/79a19bd936bb35f56ef0ccab1b3b59ebce8c762d
- https://git.kernel.org/stable/c/f76d91271bcacbd759a2e4ee3ea61faa6a727ccf
- https://git.kernel.org/stable/c/d2719a0a9c3439abf67843a5504b7afccd9ded93
- https://git.kernel.org/stable/c/2a72403b985aea6b4aac3171830492f9a387f9e1
- https://git.kernel.org/stable/c/5f6b17562f03fc65c7d3474ef8f1959b19d1ca41
- https://git.kernel.org/stable/c/b5ad887339503103d0fbe9827b16ad287597c275
- https://git.kernel.org/stable/c/a424a34b8faddf97b5af41689087e7a230f79ba7
More Linux Kernel vulnerabilities
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- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2026-43061 · CVE Program
- CVE-2026-43061 · NVD
- FIRST EPSS
- GHSA-6grr-36f8-j7pv · GitHub Advisory Database · CC BY 4.0
- CVE-2026-43061 · Red Hat security data · CC BY 4.0
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