CVE-2021-29626: Use After Free
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.
Affected Software
Event History
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.