CVE-2020-25578: Freebsd

Medium severity, CVSS 5.3. EPSS: 2.3% chance of exploitation in the next 30 days.

In FreeBSD 12.2-STABLE before r368969, 11.4-STABLE before r369047, 12.2-RELEASE before p3, 12.1-RELEASE before p13 and 11.4-RELEASE before p7 several file systems were not properly initializing the d_off field of the dirent structures returned by VOP_READDIR. In particular, tmpfs(5), smbfs(5), autofs(5) and mqueuefs(5) were failing to do so. As a result, eight uninitialized kernel stack bytes may be leaked to userspace by these file systems.

Affected products

• Freebsd Freebsd: version 11.4 only; version 12.1 only; version 12.2 only

Published 2021-03-26. Last modified 2026-06-17.