CVE-2026-46243
Estado: ModificadaAlta (7.1)—
In the Linux kernel, the following vulnerability has been resolved:
smb: client: reject userspace cifs.spnego descriptions
cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats as kernel-originating inputs. However, userspace can also create keys of this type through request_key(2) or add_key(2), allowing those fields to be supplied without CIFS origin.
Only accept cifs.spnego descriptions while CIFS is using its private spnego_cred to request the key.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Puntuación base: 7.1
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1078.002Domain Accountsstealth · persistence · privilege escalation · initial access75 % - Impacto secundario
T1548Abuse Elevation Control Mechanismprivilege escalation70 %
Acceso local (AV:L) con usuario sin privilegos (PR:L) permite falsificar descripciones de claves SPNEGO, escalando a credenciales administrativas o contextos privilegiados sin interacción.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
- CWE-20
- CWE-825
Referencias
- https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7
- https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079
- https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2
- https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981
- https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8
- https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824
- https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d
- https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc
- http://www.openwall.com/lists/oss-security/2026/06/01/6
- https://access.redhat.com/errata/RHSA-2026:23258
- https://access.redhat.com/errata/RHSA-2026:23259
- https://access.redhat.com/errata/RHSA-2026:23329
- https://access.redhat.com/errata/RHSA-2026:23395
- https://access.redhat.com/errata/RHSA-2026:24381
- https://access.redhat.com/errata/RHSA-2026:25908
- https://access.redhat.com/errata/RHSA-2026:26462
- https://access.redhat.com/errata/RHSA-2026:26515
- https://access.redhat.com/errata/RHSA-2026:26535
- https://access.redhat.com/errata/RHSA-2026:26563
- https://access.redhat.com/errata/RHSA-2026:26570
- https://access.redhat.com/errata/RHSA-2026:27708
- https://access.redhat.com/errata/RHSA-2026:27719
- https://access.redhat.com/errata/RHSA-2026:27729
- https://access.redhat.com/errata/RHSA-2026:27735
- https://access.redhat.com/errata/RHSA-2026:28887
- https://access.redhat.com/errata/RHSA-2026:28962
- https://access.redhat.com/errata/RHSA-2026:33219
- https://access.redhat.com/errata/RHSA-2026:33220
- https://access.redhat.com/errata/RHSA-2026:33221
- https://access.redhat.com/errata/RHSA-2026:33222
- https://access.redhat.com/errata/RHSA-2026:33223
- https://access.redhat.com/errata/RHSA-2026:33224
- https://access.redhat.com/errata/RHSA-2026:33225
- https://access.redhat.com/errata/RHSA-2026:33486
- https://access.redhat.com/errata/RHSA-2026:34048
- https://access.redhat.com/errata/RHSA-2026:34757
- https://access.redhat.com/errata/RHSA-2026:34764
- https://access.redhat.com/errata/RHSA-2026:34788
- https://access.redhat.com/errata/RHSA-2026:34815
- https://access.redhat.com/errata/RHSA-2026:36620
- https://access.redhat.com/errata/RHSA-2026:40021
- https://access.redhat.com/errata/RHSA-2026:41236
- https://access.redhat.com/errata/RHSA-2026:47727
- https://access.redhat.com/security/cve/CVE-2026-46243
- https://bugzilla.redhat.com/show_bug.cgi?id=2481486
- https://github.com/manizada/CIFSwitch
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46243.json
JSON original (NVD)
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