CVE-2020-7462

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-26 · updated 2026-06-17
Weakness: CWE-416

Description

In 11.4-PRERELEASE before r360733 and 11.3-RELEASE before p13, improper mbuf handling in the kernel causes a use-after-free bug by sending IPv6 Hop-by-Hop options over the loopback interface. The use-after-free situation may result in unintended kernel behaviour including a kernel panic.

Affected products

FreeBSD: 11.3, 11.3-p1, 11.3-p10, 11.3-p11, 11.3-p12, 11.3-p2 (+8)

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-20:24.ipv6.asc
https://security.FreeBSD.org/advisories/FreeBSD-SA-20:24.ipv6.asc

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