CVE-2026-23224
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
erofs: fix UAF issue for file-backed mounts w/ directio option
EROFS may encounter above panic when enabling file-backed mount w/ directio mount option, the root cause is it may suffer UAF in below race condition:
Introduce a reference count in struct erofs_fileio_rq, and initialize it as two, both erofs_fileio_ki_complete() and erofs_fileio_rq_submit() will decrease reference count, the last one decreasing the reference count to zero will free rq.
Detalles técnicos trazas, registros y código del informe original
[ 9.269940][ T3222] Call trace:
[ 9.269948][ T3222] ext4_file_read_iter+0xac/0x108
[ 9.269979][ T3222] vfs_iocb_iter_read+0xac/0x198
[ 9.269993][ T3222] erofs_fileio_rq_submit+0x12c/0x180
[ 9.270008][ T3222] erofs_fileio_submit_bio+0x14/0x24
[ 9.270030][ T3222] z_erofs_runqueue+0x834/0x8ac
[ 9.270054][ T3222] z_erofs_read_folio+0x120/0x220
[ 9.270083][ T3222] filemap_read_folio+0x60/0x120
[ 9.270102][ T3222] filemap_fault+0xcac/0x1060
[ 9.270119][ T3222] do_pte_missing+0x2d8/0x1554
[ 9.270131][ T3222] handle_mm_fault+0x5ec/0x70c
[ 9.270142][ T3222] do_page_fault+0x178/0x88c
[ 9.270167][ T3222] do_translation_fault+0x38/0x54
[ 9.270183][ T3222] do_mem_abort+0x54/0xac
[ 9.270208][ T3222] el0_da+0x44/0x7c
[ 9.270227][ T3222] el0t_64_sync_handler+0x5c/0xf4
[ 9.270253][ T3222] el0t_64_sync+0x1bc/0x1c0
- z_erofs_read_folio wq s_dio_done_wq
- z_erofs_runqueue
- erofs_fileio_submit_bio
- erofs_fileio_rq_submit
- vfs_iocb_iter_read
- ext4_file_read_iter
- ext4_dio_read_iter
- iomap_dio_rw
: bio was submitted and return -EIOCBQUEUED
- dio_aio_complete_work
- dio_complete
- dio->iocb->ki_complete (erofs_fileio_ki_complete())
- kfree(rq)
: it frees iocb, iocb.ki_filp can be UAF in file_accessed().
- file_accessed
: access NULL file pointCVSS
- 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: 0.13%
- Percentil entre todas las CVEs puntuadas: 2
- 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 escalation75 % - Impacto principal
T1059Command and Scripting Interpreterexecution70 %
Vulnerabilidad UAF (CWE-416) en el kernel Linux con acceso local (AV:L) y privilegios limitados (PR:L). Permite ejecución de código tras liberar memoria, resultando en pánico del kernel y potencial ejecución arbitraria.
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
Referencias
JSON original (NVD)
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix UAF issue for file-backed mounts w/ directio option\n\n[ 9.269940][ T3222] Call trace:\n[ 9.269948][ T3222] ext4_file_read_iter+0xac/0x108\n[ 9.269979][ T3222] vfs_iocb_iter_read+0xac/0x198\n[ 9.269993][ T3222] erofs_fileio_rq_submit+0x12c/0x180\n[ 9.270008][ T3222] erofs_fileio_submit_bio+0x14/0x24\n[ 9.270030][ T3222] z_erofs_runqueue+0x834/0x8ac\n[ 9.270054][ T3222] z_erofs_read_folio+0x120/0x220\n[ 9.270083][ T3222] filemap_read_folio+0x60/0x120\n[ 9.270102][ T3222] filemap_fault+0xcac/0x1060\n[ 9.270119][ T3222] do_pte_missing+0x2d8/0x1554\n[ 9.270131][ T3222] handle_mm_fault+0x5ec/0x70c\n[ 9.270142][ T3222] do_page_fault+0x178/0x88c\n[ 9.270167][ T3222] do_translation_fault+0x38/0x54\n[ 9.270183][ T3222] do_mem_abort+0x54/0xac\n[ 9.270208][ T3222] el0_da+0x44/0x7c\n[ 9.270227][ T3222] el0t_64_sync_handler+0x5c/0xf4\n[ 9.270253][ T3222] el0t_64_sync+0x1bc/0x1c0\n\nEROFS may encounter above panic when enabling file-backed mount w/\ndirectio mount option, the root cause is it may suffer UAF in below\nrace condition:\n\n- z_erofs_read_folio wq s_dio_done_wq\n - z_erofs_runqueue\n - erofs_fileio_submit_bio\n - erofs_fileio_rq_submit\n - vfs_iocb_iter_read\n - ext4_file_read_iter\n - ext4_dio_read_iter\n - iomap_dio_rw\n : bio was submitted and return -EIOCBQUEUED\n - dio_aio_complete_work\n - dio_complete\n - dio->iocb->ki_complete (erofs_fileio_ki_complete())\n - kfree(rq)\n : it frees iocb, iocb.ki_filp can be UAF in file_accessed().\n - file_accessed\n : access NULL file point\n\nIntroduce a reference count in struct erofs_fileio_rq, and initialize it\nas two, both erofs_fileio_ki_complete() and erofs_fileio_rq_submit() will\ndecrease reference count, the last one decreasing the reference count\nto zero will free rq."
},
{
"lang": "es",
"value": "Se ha resuelto la siguiente vulnerabilidad en el kernel de Linux:\n\nerofs: soluciona un problema de UAF para montajes respaldados por archivos con la opción 'directio'\n\n[ 9.269940][ T3222] Rastreo de llamadas:\n[ 9.269948][ T3222] ext4_file_read_iter+0xac/0x108\n[ 9.269979][ T3222] vfs_iocb_iter_read+0xac/0x198\n[ 9.269993][ T3222] erofs_fileio_rq_submit+0x12c/0x180\n[ 9.270008][ T3222] erofs_fileio_submit_bio+0x14/0x24\n[ 9.270030][ T3222] z_erofs_runqueue+0x834/0x8ac\n[ 9.270054][ T3222] z_erofs_read_folio+0x120/0x220\n[ 9.270083][ T3222] filemap_read_folio+0x60/0x120\n[ 9.270102][ T3222] filemap_fault+0xcac/0x1060\n[ 9.270119][ T3222] do_pte_missing+0x2d8/0x1554\n[ 9.270131][ T3222] handle_mm_fault+0x5ec/0x70c\n[ 9.270142][ T3222] do_page_fault+0x178/0x88c\n[ 9.270167][ T3222] do_translation_fault+0x38/0x54\n[ 9.270183][ T3222] do_mem_abort+0x54/0xac\n[ 9.270208][ T3222] el0_da+0x44/0x7c\n[ 9.270227][ T3222] el0t_64_sync_handler+0x5c/0xf4\n[ 9.270253][ T3222] el0t_64_sync+0x1bc/0x1c0\n\nEROFS puede encontrar el pánico anterior al habilitar el montaje respaldado por archivos con la opción de montaje directio; la causa raíz es que puede sufrir UAF en la siguiente condición de carrera:\n\n- z_erofs_read_folio wq s_dio_done_wq\n - z_erofs_runqueue\n - erofs_fileio_submit_bio\n - erofs_fileio_rq_submit\n - vfs_iocb_iter_read\n - ext4_file_read_iter\n - ext4_dio_read_iter\n - iomap_dio_rw\n : bio fue enviado y devuelve -EIOCBQUEUED\n - dio_aio_complete_work\n - dio_complete\n - dio->iocb->ki_complete (erofs_fileio_ki_complete())\n - kfree(rq)\n : libera iocb, iocb.ki_filp puede ser UAF en file_accessed().\n - file_accessed\n : accede a un puntero de archivo NULL\n\nIntroducir un contador de referencias en la estructura erofs_fileio_rq, y lo inicializa a dos; tanto erofs_fileio_ki_complete() como erofs_fileio_rq_submit() disminuirán el contador de referencias, el último en disminuir el contador de referencias a cero liberará rq."
}
],
"lastModified": "2026-06-17T10:21:08.060",
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