What’s Vulnerable › Vulnerabilities

CVE-2021-29626

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-07 · updated 2026-06-17
• Weakness: CWE-416

Description

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 products

• FreeBSD: before 11.4; from 12.0 before 12.2; 11.4, 11.4-beta1, 11.4-p1, 11.4-p2, 11.4-p3, 11.4-p4 (+15) — fixed in 11.4, 12.2

How to fix

Upgrade to a fixed version: FreeBSD 11.4, 12.2. Check the vendor advisory for mitigations.

References

• https://security.FreeBSD.org/advisories/FreeBSD-SA-21:08.vm.asc
• https://security.netapp.com/advisory/ntap-20210423-0008/
• https://security.FreeBSD.org/advisories/FreeBSD-SA-21:08.vm.asc
• https://security.netapp.com/advisory/ntap-20210423-0008/

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