CVE-2021-47232: can: j1939: fix Use-after-Free, hold skb ref while in use
First published: Tue May 21 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=5.4<5.4.128 | |
| Linux Kernel | >=5.5<5.10.46 | |
| Linux Kernel | >=5.11<5.12.13 | |
| Linux Kernel | =5.13-rc1 | |
| Linux Kernel | =5.13-rc2 | |
| Linux Kernel | =5.13-rc3 | |
| Linux Kernel | =5.13-rc4 | |
| Linux Kernel | =5.13-rc5 | |
| Linux Kernel | =5.13-rc6 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-47232?
CVE-2021-47232 has been classified as a medium severity vulnerability.
How do I fix CVE-2021-47232?
To fix CVE-2021-47232, update your Linux kernel to a version that includes the patch, such as versions beyond 5.13-rc6.
What type of vulnerability is CVE-2021-47232?
CVE-2021-47232 is a Use-after-Free vulnerability in the Linux kernel.
Which versions of the Linux kernel are affected by CVE-2021-47232?
CVE-2021-47232 affects Linux kernel versions from 5.4 to 5.13-rc6.
Is CVE-2021-47232 exploitable remotely?
Yes, CVE-2021-47232 can potentially be exploited remotely, which may lead to arbitrary code execution.
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