# can: peak_pci: peak_pci_remove(): fix UAF

CVE record · `CVE-2021-47456`

- **Identifiers:** `CVE-2021-47456`
- **State:** Confirmed
- **Severity:** CVSS 8.4 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-416](https://cwe.mitre.org/data/definitions/416.html) · [CWE-467](https://cwe.mitre.org/data/definitions/467.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md) · [CWE-467](https://agentprime.io/advisories/tag/cwe-467.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 22 May 2024
- **Updated:** 11 May 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 22 May 2024, 06:19 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: `e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd to before 1c616528ba4aeb1125a06b407572ab7b56acae38` (git)
  - affected: `e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd to before 447d44cd2f67a20b596ede3ca3cd67086dfd9ca9` (git)
  - affected: `e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd to before 34914971bb3244db4ce2be44e9438a9b30c56250` (git)
  - affected: `e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd to before adbda14730aacce41c0d3596415aa39ad63eafd9` (git)
  - affected: `e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd to before 1248582e47a9f7ce0ecd156c39fc61f8b6aa3699` (git)
  - affected: `e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd to before 28f28e4bc3a5e0051faa963f10b778ab38c1db69` (git)
  - affected: `e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd to before 0e5afdc2315b0737edcf55bede4ee1640d2d464d` (git)
  - affected: `e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd to before 949fe9b35570361bc6ee2652f89a0561b26eec98` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.4`
  - unaffected: `before 3.4` (semver)
  - unaffected: `4.4.290 to 4.4.*, inclusive` (semver)
  - unaffected: `4.9.288 to 4.9.*, inclusive` (semver)
  - unaffected: `4.14.253 to 4.14.*, inclusive` (semver)
  - unaffected: `4.19.214 to 4.19.*, inclusive` (semver)
  - unaffected: `5.4.156 to 5.4.*, inclusive` (semver)
  - unaffected: `5.10.76 to 5.10.*, inclusive` (semver)
  - unaffected: `5.14.15 to 5.14.*, inclusive` (semver)
  - unaffected: `5.15 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0024, the 14th percentile, on 5 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 22 May 2024. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2021-47456](https://www.cve.org/CVERecord?id=CVE-2021-47456)
- [NVD: CVE-2021-47456](https://nvd.nist.gov/vuln/detail/CVE-2021-47456)

### References from the CNA

- <https://git.kernel.org/stable/c/1c616528ba4aeb1125a06b407572ab7b56acae38>
- <https://git.kernel.org/stable/c/447d44cd2f67a20b596ede3ca3cd67086dfd9ca9>
- <https://git.kernel.org/stable/c/34914971bb3244db4ce2be44e9438a9b30c56250>
- <https://git.kernel.org/stable/c/adbda14730aacce41c0d3596415aa39ad63eafd9>
- <https://git.kernel.org/stable/c/1248582e47a9f7ce0ecd156c39fc61f8b6aa3699>
- <https://git.kernel.org/stable/c/28f28e4bc3a5e0051faa963f10b778ab38c1db69>
- <https://git.kernel.org/stable/c/0e5afdc2315b0737edcf55bede4ee1640d2d464d>
- <https://git.kernel.org/stable/c/949fe9b35570361bc6ee2652f89a0561b26eec98>

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-2021-47456>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2021-47456/>. Everything for agents: <https://agentprime.io/llms.txt>.