CVE-2026-4747Each RPCSEC_GSS data packet is validated by a routine which checks a signature in the packet.
Updated under an hour ago ()
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It affects freebsd. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.8 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-121
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
freebsd freebsd freebsd:freebsd | 13.5; 13.5; 13.5; 13.5; 13.5; 13.5; 13.5; 13.5; and 21 more ranges | NVD |
References
- https://security.freebsd.org/advisories/FreeBSD-SA-26:08.rpcsec_gss.ascvendor-advisory
- https://github.com/califio/publications/tree/main/MADBugs/CVE-2026-4747exploit, third-party-advisory
- https://github.com/califio/publications/blob/main/MADBugs/CVE-2026-4747/exploit.pyexploit
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.