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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (24.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- FreeBSD — versions 11.4, 12.2, 13.0
- FreeBSD — versions FreeBSD 12.2-RELEASE before p6, 11.4-RELEASE before p9
Weakness classification (CWE)
References
- security.FreeBSD.org/advisories/FreeBSD-SA-21:08.vm.asc (Vendor Advisory)
- security.netapp.com/advisory/ntap-20210423-0008/ (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.