# CVE-2021-47232: linux: In the Linux kernel, the following vulnerability has been resolved:  can: j1939: fix Use-after-Free, hold skb ref whi...

CVE-2021-47232 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47232, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2021-47232
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0062
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  can: j1939: fix Use-after-Free, hold skb ref while in use  This patch fixes a Use-after-Free found by the syzbot.  The problem is that a skb is taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free if the skb is taken concurrently from the session queue due to a CTS.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.46-1 | [DEBIAN-CVE-2021-47232](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47232.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.46-1 | [DEBIAN-CVE-2021-47232](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47232.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.10.46-1 | [DEBIAN-CVE-2021-47232](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47232.md) | May 21, 2024 |

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