8.8
CVE-2026-4747
- EPSS 1.88%
- Veröffentlicht 26.03.2026 06:21:12
- Zuletzt bearbeitet 20.04.2026 13:47:31
- Erkennungen
Remote code execution via RPCSEC_GSS packet validation
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.
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Login| Typ | Quelle | Score | Percentile |
|---|---|---|---|
| EPSS | FIRST.org | 1.88% | 0.773 |
| Quelle | Base Score | Exploit Score | Impact Score | Vector String |
|---|---|---|---|---|
| CISA-ADP | 8.8 | 2.8 | 5.9 |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
|
CWE-121 Stack-based Buffer Overflow
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
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https://security.freebsd.org/advisories/FreeBSD-SA-26:08.rpcsec_gss.asc
https://github.com/califio/publications/tree/main/MADBugs/CVE-2026-4747
https://github.com/califio/publications/blob/main/MADBugs/CVE-2026-4747/exploit.py