Use after free in FreeBSD
Priority LOW 24CWE-416Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.00229 13th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | FreeBSD | FreeBSD 11.3-RELEASE before p13 | — | No fix listed | CNA |
- FreeBSD Vendor— Affected FreeBSD 11.3-RELEASE before p13 Fixed in — No fix listed CNA
CPE configurations NVD · 14
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:freebsd:freebsd:11.3:-:*:*:*:*:*:* | 11.3 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p1:*:*:*:*:*:* | 11.3 p1 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p10:*:*:*:*:*:* | 11.3 p10 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p11:*:*:*:*:*:* | 11.3 p11 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p12:*:*:*:*:*:* | 11.3 p12 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p2:*:*:*:*:*:* | 11.3 p2 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p3:*:*:*:*:*:* | 11.3 p3 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p4:*:*:*:*:*:* | 11.3 p4 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p5:*:*:*:*:*:* | 11.3 p5 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p6:*:*:*:*:*:* | 11.3 p6 | Vulnerable | FreeBSD |
- cpe:2.3:o:freebsd:freebsd:11.3:-:*:*:*:*:*:* Versions 11.3 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p1:*:*:*:*:*:* Versions 11.3 p1 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p10:*:*:*:*:*:* Versions 11.3 p10 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p11:*:*:*:*:*:* Versions 11.3 p11 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p12:*:*:*:*:*:* Versions 11.3 p12 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p2:*:*:*:*:*:* Versions 11.3 p2 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p3:*:*:*:*:*:* Versions 11.3 p3 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p4:*:*:*:*:*:* Versions 11.3 p4 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p5:*:*:*:*:*:* Versions 11.3 p5 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p6:*:*:*:*:*:* Versions 11.3 p6 Vulnerable ·FreeBSD
Show 4 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:freebsd:freebsd:11.3:p7:*:*:*:*:*:* | 11.3 p7 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p8:*:*:*:*:*:* | 11.3 p8 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:p9:*:*:*:*:*:* | 11.3 p9 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.4:-:*:*:*:*:*:* | 11.4 | Vulnerable | FreeBSD |
- cpe:2.3:o:freebsd:freebsd:11.3:p7:*:*:*:*:*:* Versions 11.3 p7 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p8:*:*:*:*:*:* Versions 11.3 p8 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:p9:*:*:*:*:*:* Versions 11.3 p9 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.4:-:*:*:*:*:*:* Versions 11.4 Vulnerable ·FreeBSD
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-7462
- 2026-10-03 Alias added: GHSA-vfw2-5cx4-6c4q
References
More Freebsd vulnerabilities
- TI-2011-04182 Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT… CVSS 2.0HIGH 10.0
- TI-2007-03684 Integer overflow in print-bgp.c in the BGP dissector in tcpdump 3.9.6 and earlier allows… CVSS 3.1CRITICAL 9.8
- TI-2002-00376 Integer overflow in xdr_array function in RPC servers for operating systems that use… CVSS 3.1CRITICAL 9.8
- TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
- TI-2003-00437 Off-by-one error in the fb_realpath() function, as derived from the realpath function in… CVSS 3.1CRITICAL 9.8
- TI-2003-00642 The prescan function in Sendmail 8.12.9 allows remote attackers to execute arbitrary code… CVSS 2.0HIGH 10.0
Sources
- CVE-2020-7462 · CVE Program
- CVE-2020-7462 · NVD
- FIRST EPSS
- GHSA-vfw2-5cx4-6c4q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences