CVE-2026-23074
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
net/sched: Enforce that teql can only be used as root qdisc
Design intent of teql is that it is only supposed to be used as root qdisc. We need to check for that constraint.
Although not important, I will describe the scenario that unearthed this issue for the curious.
GangMin Kim <km.kim1503@gmail.com> managed to concot a scenario as follows:
GangMin sends a packet which is enqueued to 1:1 (netem). Any invocation of dequeue by QFQ from this class will not return a packet until after 6.4s.
Leer descripción completaMostrar menos
In the meantime, a second packet is sent and it lands on 1:2. teql's enqueue will return success and this will activate class 1:2. Main issue is that teql only updates the parent visible qlen (sch->q.qlen) at dequeue. Since QFQ will only call dequeue if peek succeeds (and teql's peek always returns NULL), dequeue will never be called and thus the qlen will remain as 0. With that in mind, when GangMin updates 1:2's lmax value, the qfq_change_class calls qfq_deact_rm_from_agg. Since the child qdisc's qlen was not incremented, qfq fails to deactivate the class, but still frees its pointers from the aggregate. So when the first packet is rescheduled after 6.4 seconds (netem's delay), a dangling pointer is accessed causing GangMin's causing a UAF.
Detalles técnicos trazas, registros y código del informe original
ROOT qdisc 1:0 (QFQ) ├── class 1:1 (weight=15, lmax=16384) netem with delay 6.4s └── class 1:2 (weight=1, lmax=1514) teql
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: 0.16%
- Percentil entre todas las CVEs puntuadas: 4
- Fecha de la puntuación: 5/10/2026
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
T1059Command and Scripting Interpreterexecution75 %
Acceso local (AV:L) sin interacción (UI:N) con privilegios de usuario (PR:L). Use-after-free en kernel permite ejecutar código arbitrario con privilegios elevados tras manipular qdiscs.
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
- CWE-416
- CWE-825
Referencias
- https://git.kernel.org/stable/c/0686bedfed34155520f3f735cbf3210cb9044380
- https://git.kernel.org/stable/c/16ed73c1282d376b956bff23e5139add061767ba
- https://git.kernel.org/stable/c/4c7e8aa71c9232cba84c289b4b56cba80b280841
- https://git.kernel.org/stable/c/50da4b9d07a7a463e2cfb738f3ad4cff6b2c9c3b
- https://git.kernel.org/stable/c/73d970ff0eddd874a84c953387c7f4464b705fc6
- https://git.kernel.org/stable/c/ae810e6a8ac4fe25042e6825d2a401207a2e41fb
- https://git.kernel.org/stable/c/dad49a67c2d817bfec98e6e45121b351e3a0202c
- https://access.redhat.com/errata/RHSA-2026:3083
- https://access.redhat.com/errata/RHSA-2026:3110
- https://access.redhat.com/errata/RHSA-2026:3268
- https://access.redhat.com/errata/RHSA-2026:3277
- https://access.redhat.com/errata/RHSA-2026:3360
- https://access.redhat.com/errata/RHSA-2026:3388
- https://access.redhat.com/errata/RHSA-2026:3634
- https://access.redhat.com/errata/RHSA-2026:3685
- https://access.redhat.com/errata/RHSA-2026:3810
- https://access.redhat.com/security/cve/CVE-2026-23074
- https://bugzilla.redhat.com/show_bug.cgi?id=2436791
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23074.json
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: Enforce that teql can only be used as root qdisc\n\nDesign intent of teql is that it is only supposed to be used as root qdisc.\nWe need to check for that constraint.\n\nAlthough not important, I will describe the scenario that unearthed this\nissue for the curious.\n\nGangMin Kim <km.kim1503@gmail.com> managed to concot a scenario as follows:\n\nROOT qdisc 1:0 (QFQ)\n ├── class 1:1 (weight=15, lmax=16384) netem with delay 6.4s\n └── class 1:2 (weight=1, lmax=1514) teql\n\nGangMin sends a packet which is enqueued to 1:1 (netem).\nAny invocation of dequeue by QFQ from this class will not return a packet\nuntil after 6.4s. In the meantime, a second packet is sent and it lands on\n1:2. teql's enqueue will return success and this will activate class 1:2.\nMain issue is that teql only updates the parent visible qlen (sch->q.qlen)\nat dequeue. Since QFQ will only call dequeue if peek succeeds (and teql's\npeek always returns NULL), dequeue will never be called and thus the qlen\nwill remain as 0. With that in mind, when GangMin updates 1:2's lmax value,\nthe qfq_change_class calls qfq_deact_rm_from_agg. Since the child qdisc's\nqlen was not incremented, qfq fails to deactivate the class, but still\nfrees its pointers from the aggregate. So when the first packet is\nrescheduled after 6.4 seconds (netem's delay), a dangling pointer is\naccessed causing GangMin's causing a UAF."
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{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/sched: Forzar que teql solo pueda ser usado como qdisc raíz\n\nLa intención del diseño de teql es que solo se supone que debe ser usado como qdisc raíz.\nNecesitamos verificar esa restricción.\n\nAunque no es importante, describiré el escenario que desenterró este problema para los curiosos.\n\nGangMin Kim logró idear un escenario de la siguiente manera:\n\nqdisc RAÍZ 1:0 (QFQ)\n ??? clase 1:1 (peso=15, lmax=16384) netem con retardo de 6.4s\n ??? clase 1:2 (peso=1, lmax=1514) teql\n\nGangMin envía un paquete que es encolado a 1:1 (netem).\nCualquier invocación de desencolado por QFQ desde esta clase no devolverá un paquete hasta después de 6.4s. Mientras tanto, un segundo paquete es enviado y aterriza en 1:2. El encolado de teql devolverá éxito y esto activará la clase 1:2. El problema principal es que teql solo actualiza el qlen visible del padre (sch->q.qlen) al desencolar. Dado que QFQ solo llamará a desencolar si peek tiene éxito (y el peek de teql siempre devuelve NULL), desencolar nunca será llamado y, por lo tanto, el qlen permanecerá como 0. Con eso en mente, cuando GangMin actualiza el valor lmax de 1:2, qfq_change_class llama a qfq_deact_rm_from_agg. Dado que el qlen del qdisc hijo no fue incrementado, qfq falla al desactivar la clase, pero aún así libera sus punteros del agregado. Así, cuando el primer paquete es reprogramado después de 6.4 segundos (el retardo de netem), se accede a un puntero colgante causando un UAF de GangMin."
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"lastModified": "2026-07-15T02:18:39.290",
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