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URL: https://nvd.nist.gov/vuln/detail/CVE-2026-4747

⇱ NVD - CVE-2026-4747

  1. Vulnerabilities

CVE-2026-4747 Detail

Description

Each RPCSEC_GSS data packet is validated by a routine which checks a signature in the packet. This routine copies a portion of the packet into a stack buffer, but fails to ensure that the buffer is sufficiently large, and a malicious client can trigger a stack overflow. Notably, this does not require the client to authenticate itself first. As kgssapi.ko's RPCSEC_GSS implementation is vulnerable, remote code execution in the kernel is possible by an authenticated user that is able to send packets to the kernel's NFS server while kgssapi.ko is loaded into the kernel. In userspace, applications which have librpcgss_sec loaded and run an RPC server are vulnerable to remote code execution from any client able to send it packets. We are not aware of any such applications in the FreeBSD base system.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/califio/publications/blob/main/MADBugs/CVE-2026-4747/exploit.py CISA-ADP Exploit 
https://github.com/califio/publications/tree/main/MADBugs/CVE-2026-4747 CVE Exploit  Third Party Advisory 
https://security.freebsd.org/advisories/FreeBSD-SA-26:08.rpcsec_gss.asc FreeBSD Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-121 Stack-based Buffer Overflow FreeBSD  

Known Affected Software Configurations Switch to CPE 2.2

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Denotes Vulnerable Software
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Change History

7 change records found show changes

CVE Modified by CISA-ADP 6/17/2026 6:57:09 AM

Action Type Old Value New Value
Added SSVC 
{"timestamp":"2026-03-26T00:00:00+00:00","id":"CVE-2026-4747","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}

CVE Modified by FreeBSD 6/17/2026 6:57:09 AM

Action Type Old Value New Value
Added Affected 
[{"vendor":"FreeBSD","product":"FreeBSD","defaultStatus":"unknown","modules":["rpcsec_gss"],"versions":[{"version":"15.0-RELEASE","lessThan":"p5","versionType":"release","status":"affected"},{"version":"14.4-RELEASE","lessThan":"p1","versionType":"release","status":"affected"},{"version":"14.3-RELEASE","lessThan":"p10","versionType":"release","status":"affected"},{"version":"13.5-RELEASE","lessThan":"p11","versionType":"release","status":"affected"}]}]

Initial Analysis by NIST 4/20/2026 9:47:31 AM

Action Type Old Value New Value
Added CPE Configuration 
OR
 *cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:p1:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:p2:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:p3:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:p4:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:p5:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:p6:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:p7:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:p8:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:-:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:p9:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.4:rc1:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:beta3:*:*:*:*:*:*
 *cpe:2.3:o:freebsd:freebsd:13.5:p10:*:*:*:*:*:*
Added Reference Type 
CISA-ADP: https://github.com/califio/publications/blob/main/MADBugs/CVE-2026-4747/exploit.py Types: Exploit
Added Reference Type 
CVE: https://github.com/califio/publications/tree/main/MADBugs/CVE-2026-4747 Types: Exploit, Third Party Advisory
Added Reference Type 
FreeBSD: https://security.freebsd.org/advisories/FreeBSD-SA-26:08.rpcsec_gss.asc Types: Vendor Advisory

CVE Modified by CVE 4/01/2026 11:23:23 AM

Action Type Old Value New Value
Added Reference 
https://github.com/califio/publications/tree/main/MADBugs/CVE-2026-4747

CVE Modified by CISA-ADP 4/01/2026 11:23:23 AM

Action Type Old Value New Value
Added Reference 
https://github.com/califio/publications/blob/main/MADBugs/CVE-2026-4747/exploit.py

CVE Modified by CISA-ADP 3/26/2026 10:16:14 AM

Action Type Old Value New Value
Added CVSS V3.1 
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

New CVE Received from FreeBSD 3/26/2026 3:16:20 AM

Action Type Old Value New Value
Added Description 
Each RPCSEC_GSS data packet is validated by a routine which checks a signature in the packet. This routine copies a portion of the packet into a stack buffer, but fails to ensure that the buffer is sufficiently large, and a malicious client can trigger a stack overflow. Notably, this does not require the client to authenticate itself first.

As kgssapi.ko's RPCSEC_GSS implementation is vulnerable, remote code execution in the kernel is possible by an authenticated user that is able to send packets to the kernel's NFS server while kgssapi.ko is loaded into the kernel.

In userspace, applications which have librpcgss_sec loaded and run an RPC server are vulnerable to remote code execution from any client able to send it packets. We are not aware of any such applications in the FreeBSD base system.
Added CWE 
CWE-121
Added Reference 
https://security.freebsd.org/advisories/FreeBSD-SA-26:08.rpcsec_gss.asc

Quick Info

CVE Dictionary Entry:
CVE-2026-4747
NVD Published Date:
03/26/2026
NVD Last Modified:
06/17/2026
Source:
FreeBSD