CVE-2025-37839
Estado: AnalizadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
jbd2: remove wrong sb->s_sequence check
Journal emptiness is not determined by sb->s_sequence == 0 but rather by sb->s_start == 0 (which is set a few lines above). Furthermore 0 is a valid transaction ID so the check can spuriously trigger. Remove the invalid WARN_ON.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.33%
- Percentil entre todas las CVEs puntuadas: 25
- 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
T1499.004Application or System Exploitationimpact60 %
Acceso local (AV:L) sin interacción en jbd2 (subsistema de journaling del kernel Linux). Fallo de validación de estado que puede causar DoS. El CWE ausente y la descripción técnica de un WARN_ON inválido sugieren condición de race o validación defectuosa explotable por un atacante local.
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 (2)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/3b4643ffaf72d7a5a357e9bf68b1775f8cfe7e77
- https://git.kernel.org/stable/c/9eaec071f111cd2124ce9a5b93536d3f6837d457
- https://git.kernel.org/stable/c/ad926f735b4d4f10768fec7d080cadeb6d075cac
- https://git.kernel.org/stable/c/b0cca357f85beb6144ab60c62dcc98508cc044bf
- https://git.kernel.org/stable/c/b479839525fe7906966cdc4b5b2afbca048558a1
- https://git.kernel.org/stable/c/c88f7328bb0fff66520fc9164f02b1d06e083c1b
- https://git.kernel.org/stable/c/c98eb9ffb1d9c98237b5e1668eee17654e129fb0
- https://git.kernel.org/stable/c/cf30432f5b3064ff85d85639c2f0106f89c566f6
- https://git.kernel.org/stable/c/e6eff39dd0fe4190c6146069cc16d160e71d1148
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: remove wrong sb->s_sequence check\n\nJournal emptiness is not determined by sb->s_sequence == 0 but rather by\nsb->s_start == 0 (which is set a few lines above). Furthermore 0 is a\nvalid transaction ID so the check can spuriously trigger. Remove the\ninvalid WARN_ON."
},
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: jbd2: eliminar la comprobación incorrecta de sb->s_sequence. El vacío del diario no se determina por sb->s_sequence == 0, sino por sb->s_start == 0 (que se establece unas líneas más arriba). Además, 0 es un ID de transacción válido, por lo que la comprobación puede activarse falsamente. Eliminar el WARN_ON no válido."
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