Use after free in FreeBSD
Priority LOW 35CWE-416Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
In FreeBSD 12.0-STABLE before r349805, 12.0-RELEASE before 12.0-RELEASE-p8, 11.3-STABLE before r349806, 11.3-RELEASE before 11.3-RELEASE-p1, and 11.2-RELEASE before 11.2-RELEASE-p12, code which handles close of a descriptor created by posix_openpt fails to undo a signal configuration. This causes an incorrect signal to be raised leading to a write after free of kernel memory allowing a malicious user to gain root privileges or escape a jail.
Why it matters now
EPSS 0.00591 48th percentileScored 2026-11-07
Fix Fixed FreeBSD (FreeBSD): 11.3-RELEASE-p1
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 | FreeBSD before 12.0-RELEASE-p8; before 11.3-RELEASE-p1; and before 11.2-RELEASE-p12 | 11.3-RELEASE-p1 | Patch available | CNA |
- FreeBSD VendorFreeBSD Affected FreeBSD before 12.0-RELEASE-p8; before 11.3-RELEASE-p1; and before 11.2-RELEASE-p12 Fixed in 11.3-RELEASE-p1 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:freebsd:freebsd:11.0:-:*:*:*:*:*:* | 11.0 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.2:-:*:*:*:*:*:* | 11.2 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.3:-:*:*:*:*:*:* | 11.3 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:12.0:-:*:*:*:*:*:* | 12.0 | Vulnerable | FreeBSD |
- cpe:2.3:o:freebsd:freebsd:11.0:-:*:*:*:*:*:* Versions 11.0 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.2:-:*:*:*:*:*:* Versions 11.2 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.3:-:*:*:*:*:*:* Versions 11.3 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:12.0:-:*:*:*:*:*:* Versions 12.0 Vulnerable ·FreeBSD
Remediation
- Fix · CNA FreeBSD (FreeBSD) Fixed in 11.3-RELEASE-p1
Timeline
- 2026-10-02 Threatist record created from CVE-2019-5606
- 2026-10-03 Alias added: GHSA-42vr-5jh6-78jw
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-2019-5606 · CVE Program
- CVE-2019-5606 · NVD
- FIRST EPSS
- GHSA-42vr-5jh6-78jw · 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