CVE-2026-23047
Estado: AplazadaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
libceph: make calc_target() set t->paused, not just clear it
Currently calc_target() clears t->paused if the request shouldn't be paused anymore, but doesn't ever set t->paused even though it's able to determine when the request should be paused. Setting t->paused is left to __submit_request() which is fine for regular requests but doesn't work for linger requests -- since __submit_request() doesn't operate on linger requests, there is nowhere for lreq->t.paused to be set.
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One consequence of this is that watches don't get reestablished on paused -> unpaused transitions in cases where requests have been paused long enough for the (paused) unwatch request to time out and for the subsequent (re)watch request to enter the paused state. On top of the watch not getting reestablished, rbd_reregister_watch() gets stuck with rbd_dev->watch_mutex held:
It's waiting for lreq->reg_commit_wait to be completed, but for that to happen the respective request needs to end up on need_resend_linger list and be kicked when requests are unpaused. There is no chance for that if the request in question is never marked paused in the first place.
The fact that rbd_dev->watch_mutex remains taken out forever then prevents the image from getting unmapped -- "rbd unmap" would inevitably hang in D state on an attempt to grab the mutex.
Detalles técnicos trazas, registros y código del informe original
rbd_register_watch
__rbd_register_watch
ceph_osdc_watch
linger_reg_commit_waitCVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.19%
- Percentil entre todas las CVEs puntuadas: 8
- 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).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/2b3329b3c29d9e188e40d902d5230c2d5989b940
- https://git.kernel.org/stable/c/4d3399c52e0e61720ae898f5a0b5b75d4460ae24
- https://git.kernel.org/stable/c/4ebc711b738d139cabe2fc9e7e7749847676a342
- https://git.kernel.org/stable/c/5647d42c47b535573b63e073e91164d6a5bb058c
- https://git.kernel.org/stable/c/5d0dc83cb9a69c1d0bea58f1c430199b05f6b021
- https://git.kernel.org/stable/c/6f468f6ff233c6a81e0e761d9124e982903fe9a5
- https://git.kernel.org/stable/c/c0fe2994f9a9d0a2ec9e42441ea5ba74b6a16176
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-23047",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "922dab6134178cae317ae00de86376cba59f3147",
"lessThan": "2b3329b3c29d9e188e40d902d5230c2d5989b940",
"versionType": "git"
},
{
"status": "affected",
"version": "922dab6134178cae317ae00de86376cba59f3147",
"lessThan": "5d0dc83cb9a69c1d0bea58f1c430199b05f6b021",
"versionType": "git"
},
{
"status": "affected",
"version": "922dab6134178cae317ae00de86376cba59f3147",
"lessThan": "4d3399c52e0e61720ae898f5a0b5b75d4460ae24",
"versionType": "git"
},
{
"status": "affected",
"version": "922dab6134178cae317ae00de86376cba59f3147",
"lessThan": "4ebc711b738d139cabe2fc9e7e7749847676a342",
"versionType": "git"
},
{
"status": "affected",
"version": "922dab6134178cae317ae00de86376cba59f3147",
"lessThan": "6f468f6ff233c6a81e0e761d9124e982903fe9a5",
"versionType": "git"
},
{
"status": "affected",
"version": "922dab6134178cae317ae00de86376cba59f3147",
"lessThan": "5647d42c47b535573b63e073e91164d6a5bb058c",
"versionType": "git"
},
{
"status": "affected",
"version": "922dab6134178cae317ae00de86376cba59f3147",
"lessThan": "c0fe2994f9a9d0a2ec9e42441ea5ba74b6a16176",
"versionType": "git"
}
],
"programFiles": [
"net/ceph/osd_client.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.248",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.198",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.161",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.121",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.66",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.6",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ceph/osd_client.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-02-04T16:16:20.227",
"references": [
{
"url": "https://git.kernel.org/stable/c/2b3329b3c29d9e188e40d902d5230c2d5989b940",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4d3399c52e0e61720ae898f5a0b5b75d4460ae24",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4ebc711b738d139cabe2fc9e7e7749847676a342",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5647d42c47b535573b63e073e91164d6a5bb058c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5d0dc83cb9a69c1d0bea58f1c430199b05f6b021",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6f468f6ff233c6a81e0e761d9124e982903fe9a5",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c0fe2994f9a9d0a2ec9e42441ea5ba74b6a16176",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: make calc_target() set t->paused, not just clear it\n\nCurrently calc_target() clears t->paused if the request shouldn't be\npaused anymore, but doesn't ever set t->paused even though it's able to\ndetermine when the request should be paused. Setting t->paused is left\nto __submit_request() which is fine for regular requests but doesn't\nwork for linger requests -- since __submit_request() doesn't operate\non linger requests, there is nowhere for lreq->t.paused to be set.\nOne consequence of this is that watches don't get reestablished on\npaused -> unpaused transitions in cases where requests have been paused\nlong enough for the (paused) unwatch request to time out and for the\nsubsequent (re)watch request to enter the paused state. On top of the\nwatch not getting reestablished, rbd_reregister_watch() gets stuck with\nrbd_dev->watch_mutex held:\n\n rbd_register_watch\n __rbd_register_watch\n ceph_osdc_watch\n linger_reg_commit_wait\n\nIt's waiting for lreq->reg_commit_wait to be completed, but for that to\nhappen the respective request needs to end up on need_resend_linger list\nand be kicked when requests are unpaused. There is no chance for that\nif the request in question is never marked paused in the first place.\n\nThe fact that rbd_dev->watch_mutex remains taken out forever then\nprevents the image from getting unmapped -- \"rbd unmap\" would inevitably\nhang in D state on an attempt to grab the mutex."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nlibceph: hacer que calc_target() establezca t->paused, no solo lo borre\n\nActualmente, calc_target() borra t->paused si la solicitud ya no debería estar en pausa, pero nunca establece t->paused a pesar de que es capaz de determinar cuándo la solicitud debería estar en pausa. El establecimiento de t->paused se deja a __submit_request(), lo cual está bien para las solicitudes regulares pero no funciona para las solicitudes persistentes (linger requests) -- ya que __submit_request() no opera en solicitudes persistentes, no hay dónde establecer lreq->t.paused. Una consecuencia de esto es que las vigilancias no se restablecen en las transiciones de pausado -> despausado en casos donde las solicitudes han estado en pausa el tiempo suficiente para que la solicitud de desvigilancia (unwatch) (pausada) expire y para que la solicitud de (re)vigilancia (re)watch subsiguiente entre en el estado de pausa. Además de que la vigilancia no se restablece, rbd_reregister_watch() se queda atascado con rbd_dev->watch_mutex retenido:\n\n rbd_register_watch\n __rbd_register_watch\n ceph_osdc_watch\n linger_reg_commit_wait\n\nEstá esperando que lreq->reg_commit_wait se complete, pero para que eso suceda la solicitud respectiva necesita terminar en la lista need_resend_linger y ser activada cuando las solicitudes se despausan. No hay posibilidad de eso si la solicitud en cuestión nunca se marca como pausada en primer lugar.\n\nEl hecho de que rbd_dev->watch_mutex permanezca retenido indefinidamente entonces evita que la imagen se desmapee -- 'rbd unmap' se colgaría inevitablemente en estado D en un intento de tomar el mutex."
}
],
"lastModified": "2026-06-17T10:20:46.180",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}