CVE-2021-47232 can: j1939: fix Use-after-Free, hold skb ref while in use

2024-05-2114:19:35

Linux

github.com

cve-2021-47232

linux kernel

skb queue

AI Score

6.8

Confidence

Low

EPSS

Percentile

15.5%

SSVC

Exploitation

none

Automatable

Technical Impact

total

JSON

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.

ADP Affected

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      {
        "status": "affected",
        "version": "9d71dd0c7009",
        "lessThan": "22cba878abf6 ",
        "versionType": "custom"
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    "defaultStatus": "unknown"
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