CVE-2024-53057
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT
In qdisc_tree_reduce_backlog, Qdiscs with major handle ffff: are assumed to be either root or ingress. This assumption is bogus since it's valid to create egress qdiscs with major handle ffff: Budimir Markovic found that for qdiscs like DRR that maintain an active class list, it will cause a UAF with a dangling class pointer.
In 066a3b5b2346, the concern was to avoid iterating over the ingress qdisc since its parent is itself. The proper fix is to stop when parent TC_H_ROOT is reached because the only way to retrieve ingress is when a hierarchy which does not contain a ffff: major handle call into qdisc_lookup with TC_H_MAJ(TC_H_ROOT).
Leer descripción completaMostrar menos
In the scenario where major ffff: is an egress qdisc in any of the tree levels, the updates will also propagate to TC_H_ROOT, which then the iteration must stop.
net/sched/sch_api.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
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: 0.29%
- Percentil entre todas las CVEs puntuadas: 20
- 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
T1059Command and Scripting Interpreterexecution70 %
Vulnerabilidad local (AV:L/PR:L) en kernel Linux con UAF (CWE-416) que permite escalada de privilegios; el impacto de confidencialidad/integridad/disponibilidad (C:H/I:H/A:H) sugiere ejecución de código elevado.
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-416
Referencias
- https://git.kernel.org/stable/c/05df1b1dff8f197f1c275b57ccb2ca33021df552
- https://git.kernel.org/stable/c/2e95c4384438adeaa772caa560244b1a2efef816
- https://git.kernel.org/stable/c/580b3189c1972aff0f993837567d36392e9d981b
- https://git.kernel.org/stable/c/597cf9748c3477bf61bc35f0634129f56764ad24
- https://git.kernel.org/stable/c/9995909615c3431a5304c1210face5f268d24dba
- https://git.kernel.org/stable/c/ce691c814bc7a3c30c220ffb5b7422715458fd9b
- https://git.kernel.org/stable/c/dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20
- https://git.kernel.org/stable/c/e7f9a6f97eb067599a74f3bcb6761976b0ed303e
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT\n\nIn qdisc_tree_reduce_backlog, Qdiscs with major handle ffff: are assumed\nto be either root or ingress. This assumption is bogus since it's valid\nto create egress qdiscs with major handle ffff:\nBudimir Markovic found that for qdiscs like DRR that maintain an active\nclass list, it will cause a UAF with a dangling class pointer.\n\nIn 066a3b5b2346, the concern was to avoid iterating over the ingress\nqdisc since its parent is itself. The proper fix is to stop when parent\nTC_H_ROOT is reached because the only way to retrieve ingress is when a\nhierarchy which does not contain a ffff: major handle call into\nqdisc_lookup with TC_H_MAJ(TC_H_ROOT).\n\nIn the scenario where major ffff: is an egress qdisc in any of the tree\nlevels, the updates will also propagate to TC_H_ROOT, which then the\niteration must stop.\n\n\n net/sched/sch_api.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: stop qdisc_tree_reduce_backlog en TC_H_ROOT En qdisc_tree_reduce_backlog, se supone que las Qdisc con el identificador principal ffff: son raíz o de entrada. Esta suposición es falsa ya que es válido crear qdiscs de salida con el identificador principal ffff: Budimir Markovic descubrió que para las qdisc como DRR que mantienen una lista de clases activa, provocará un UAF con un puntero de clase colgante. En 066a3b5b2346, la preocupación era evitar iterar sobre la qdisc de entrada ya que su padre es ella misma. La solución adecuada es detener cuando se alcanza el padre TC_H_ROOT porque la única forma de recuperar la entrada es cuando una jerarquía que no contiene un identificador principal ffff: llama a qdisc_lookup con TC_H_MAJ(TC_H_ROOT). En el escenario donde el ffff principal es una qdisc de salida en cualquiera de los niveles del árbol, las actualizaciones también se propagarán a TC_H_ROOT, donde luego la iteración debe detenerse. net/sched/sch_api.c | 2 +- 1 archivo modificado, 1 inserción(+), 1 eliminación(-)"
}
],
"lastModified": "2026-06-17T08:08:09.547",
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