UBUNTU-CVE-2021-4083
A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system. This flaw affects Linux kernel versions prior to 5.16-rc4.
02 / AFFECTED SOFTWARE
Affected packages
12 explicit affected versions
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7 explicit affected versions
42 explicit affected versions
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33 explicit affected versions
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32 explicit affected versions
10 explicit affected versions
3 explicit affected versions
29 explicit affected versions
44 explicit affected versions
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26 explicit affected versions
38 explicit affected versions
9 explicit affected versions
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32 explicit affected versions
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86 explicit affected versions
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54 explicit affected versions
32 explicit affected versions
43 explicit affected versions
1 explicit affected versions
93 explicit affected versions
103 explicit affected versions
33 explicit affected versions
4 explicit affected versions
21 explicit affected versions
1 explicit affected versions
10 explicit affected versions
50 explicit affected versions
6 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system. This flaw affects Linux kernel versions prior to 5.16-rc4.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/054aa8d439b9185d4f5eb9a90282d1ce74772969
- https://ubuntu.com/security/CVE-2021-4083
- https://ubuntu.com/security/notices/USN-5278-1
- https://ubuntu.com/security/notices/USN-5294-1
- https://ubuntu.com/security/notices/USN-5294-2
- https://ubuntu.com/security/notices/USN-5295-1
- https://ubuntu.com/security/notices/USN-5295-2
- https://ubuntu.com/security/notices/USN-5297-1
- https://ubuntu.com/security/notices/USN-5298-1
- https://ubuntu.com/security/notices/USN-5361-1
- https://ubuntu.com/security/notices/USN-5362-1
- https://www.cve.org/CVERecord?id=CVE-2021-4083