CVE-2021-32606: Use After Free
First published: Tue May 11 2021(Updated: )
In the Linux kernel 5.11 through 5.12.2, isotp_setsockopt in net/can/isotp.c allows privilege escalation to root by leveraging a use-after-free. (This does not affect earlier versions that lack CAN ISOTP SF_BROADCAST support.)
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | >=5.11<5.12.9 | |
| Fedora | =32 | |
| Fedora | =33 | |
| Fedora | =34 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2021/05/12/1
- http://www.openwall.com/lists/oss-security/2021/05/13/2
- http://www.openwall.com/lists/oss-security/2021/05/14/1
- http://www.openwall.com/lists/oss-security/2021/05/28/1
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/73D53S4IZFPFQMRABMXXLW4AJK3EULDX/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GI7Z7UBWBGD3ABNIL2DC7RQDCGA4UVQW/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HD3NJBG25AADVGPRC63RX2JOQBMPSWK4/
- https://security.netapp.com/advisory/ntap-20210625-0001/
- https://www.openwall.com/lists/oss-security/2021/05/11/16
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HD3NJBG25AADVGPRC63RX2JOQBMPSWK4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GI7Z7UBWBGD3ABNIL2DC7RQDCGA4UVQW/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/73D53S4IZFPFQMRABMXXLW4AJK3EULDX/
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2b17c400aeb44daf041627722581ade527bb3c1d
Frequently Asked Questions
What is the severity of CVE-2021-32606?
CVE-2021-32606 is considered a high severity vulnerability as it allows privilege escalation to root.
How do I fix CVE-2021-32606?
To fix CVE-2021-32606, upgrade the Linux kernel to a version greater than 5.12.2 that does not include the vulnerability.
Which Linux kernel versions are affected by CVE-2021-32606?
CVE-2021-32606 affects Linux kernel versions 5.11 through 5.12.2.
Does CVE-2021-32606 affect earlier versions of the Linux kernel?
No, CVE-2021-32606 does not affect earlier versions that lack CAN ISOTP SF_BROADCAST support.
What type of vulnerability is CVE-2021-32606?
CVE-2021-32606 is a use-after-free vulnerability that can be exploited for privilege escalation.
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