Use After Free in Freebsd
CVE-2021-29626
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.
Vulnerability class: Use-After-Free
EPSS: 0.003 (26.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Freebsd — versions 11.4, 12.2, 13.0
- N/a Freebsd — versions FreeBSD 12.2-RELEASE before p6, 11.4-RELEASE before p9
Weakness classification (CWE)
References
- secteam@freebsd.org (x_refsource_MISC, Vendor Advisory)
- secteam@freebsd.org (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-29626?
- CVE-2021-29626 is a medium-severity vulnerability in Freebsd, classified under Use After Free. CVSS score: 5.5/10. Published 2021-04-07.
- How severe is CVE-2021-29626?
- Medium severity. CVSS v3 base score is 5.5 out of 10.