CVE-2021-29626: Use After Free
First published: Wed Apr 07 2021(Updated: )
In FreeBSD 13.0-STABLE before n245117, 12.2-STABLE before r369551, 11.4-STABLE before r369559, 13.0-RC5 before p1, 12.2-RELEASE before p6, and 11.4-RELEASE before p9, copy-on-write logic failed to invalidate shared memory page mappings between multiple processes allowing an unprivileged process to maintain a mapping after it is freed, allowing the process to read private data belonging to other processes or the kernel.
Credit: secteam@freebsd.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FreeBSD FreeBSD | <11.4 | |
| FreeBSD FreeBSD | >=12.0<12.2 | |
| FreeBSD FreeBSD | =11.4 | |
| FreeBSD FreeBSD | =11.4-beta1 | |
| FreeBSD FreeBSD | =11.4-p1 | |
| FreeBSD FreeBSD | =11.4-p2 | |
| FreeBSD FreeBSD | =11.4-p3 | |
| FreeBSD FreeBSD | =11.4-p4 | |
| FreeBSD FreeBSD | =11.4-p5 | |
| FreeBSD FreeBSD | =11.4-rc1 | |
| FreeBSD FreeBSD | =11.4-rc2 | |
| FreeBSD FreeBSD | =12.2 | |
| FreeBSD FreeBSD | =12.2-p1 | |
| FreeBSD FreeBSD | =12.2-p2 | |
| FreeBSD FreeBSD | =13.0-beta1 | |
| FreeBSD FreeBSD | =13.0-beta2 | |
| FreeBSD FreeBSD | =13.0-beta3 | |
| FreeBSD FreeBSD | =13.0-beta4 | |
| FreeBSD FreeBSD | =13.0-rc1 | |
| FreeBSD FreeBSD | =13.0-rc2 | |
| FreeBSD FreeBSD | =13.0-rc3 | |
| FreeBSD FreeBSD | =13.0-rc4 | |
| FreeBSD FreeBSD | =13.0-rc5 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-29626?
CVE-2021-29626 is a vulnerability in FreeBSD that allows an unprivileged process to access sensitive information.
What is the severity of CVE-2021-29626?
CVE-2021-29626 has a severity score of 5.5, which is considered medium.
Which versions of FreeBSD are affected by CVE-2021-29626?
FreeBSD 13.0-STABLE before n245117, 12.2-STABLE before r369551, 11.4-STABLE before r369559, 13.0-RC5 before p1, 12.2-RELEASE before p6, and 11.4-RELEASE before p9 are affected by CVE-2021-29626.
How does CVE-2021-29626 work?
CVE-2021-29626 occurs due to copy-on-write logic failing to invalidate shared memory page mappings between processes, allowing an unprivileged process to access sensitive information.
How can I fix CVE-2021-29626?
To fix CVE-2021-29626, it is recommended to update to FreeBSD 13.0-STABLE n245117, 12.2-STABLE r369551, 11.4-STABLE r369559, 13.0-RC5 p1, 12.2-RELEASE p6, or 11.4-RELEASE p9 or later versions.
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- version/freebsd freebsd/12.0
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- version/freebsd freebsd/11.4-p1
- version/freebsd freebsd/11.4-p2
- version/freebsd freebsd/11.4-p3
- version/freebsd freebsd/11.4-p4
- version/freebsd freebsd/11.4-p5
- version/freebsd freebsd/11.4-rc1
- version/freebsd freebsd/11.4-rc2
- version/freebsd freebsd/12.2
- version/freebsd freebsd/12.2-p1
- version/freebsd freebsd/12.2-p2
- version/freebsd freebsd/13.0-beta1
- version/freebsd freebsd/13.0-beta2
- version/freebsd freebsd/13.0-beta3
- version/freebsd freebsd/13.0-beta4
- version/freebsd freebsd/13.0-rc1
- version/freebsd freebsd/13.0-rc2
- version/freebsd freebsd/13.0-rc3
- version/freebsd freebsd/13.0-rc4
- version/freebsd freebsd/13.0-rc5