# powerpc/set_memory: Avoid spinlock recursion in change_page_attr()

CVE record · `CVE-2021-47632`

- **Identifiers:** `CVE-2021-47632`
- **State:** Confirmed
- **Severity:** CVSS 5.5 Medium
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-667](https://cwe.mitre.org/data/definitions/667.html)
- **Tags:** [CWE-667](https://agentprime.io/advisories/tag/cwe-667.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 26 Feb 2025
- **Updated:** 11 May 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 26 Feb 2025, 01:54 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `1f9ad21c3b384a8f16d8c46845a48a01d281a603 to before 6def4eaf0391f24be541633a954c0e4876858b1e` (git)
  - affected: `1f9ad21c3b384a8f16d8c46845a48a01d281a603 to before 96917107e67846f1d959ed03be281048efad14c5` (git)
  - affected: `1f9ad21c3b384a8f16d8c46845a48a01d281a603 to before 6ebe5ca2cbe438a688f2ae238ef5a0b0b5f3468a` (git)
  - affected: `1f9ad21c3b384a8f16d8c46845a48a01d281a603 to before a4c182ecf33584b9b2d1aa9dad073014a504c01f` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.14`
  - unaffected: `before 5.14` (semver)
  - unaffected: `5.15.34 to 5.15.*, inclusive` (semver)
  - unaffected: `5.16.20 to 5.16.*, inclusive` (semver)
  - unaffected: `5.17.3 to 5.17.*, inclusive` (semver)
  - unaffected: `5.18 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 5.5 Medium, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`, from ADP (CISA-ADP)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0019, the 8th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 26 Feb 2025. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2021-47632](https://www.cve.org/CVERecord?id=CVE-2021-47632)
- [NVD: CVE-2021-47632](https://nvd.nist.gov/vuln/detail/CVE-2021-47632)

### References from the CNA

- <https://git.kernel.org/stable/c/6def4eaf0391f24be541633a954c0e4876858b1e>
- <https://git.kernel.org/stable/c/96917107e67846f1d959ed03be281048efad14c5>
- <https://git.kernel.org/stable/c/6ebe5ca2cbe438a688f2ae238ef5a0b0b5f3468a>
- <https://git.kernel.org/stable/c/a4c182ecf33584b9b2d1aa9dad073014a504c01f>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2021-47632>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2021-47632/>. Everything for agents: <https://agentprime.io/llms.txt>.