Critical severity · published May 21, 2024
CVE-2021-47232
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…
9.8
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.4 before 5.4.128; 5.5 before 5.10.46; 5.11 before 5.12.13; 5.13; 5.13; 5.13; +3 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-47232
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-47232
Patch
https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705
Patch
https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678
Patch
https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256
Patch
https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22
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