CVE-2026-43006
Estado: AnalizadaAlta (7.1)—
In the Linux kernel, the following vulnerability has been resolved:
io_uring/rsrc: reject zero-length fixed buffer import
validate_fixed_range() admits buf_addr at the exact end of the registered region when len is zero, because the check uses strict greater-than (buf_end > imu->ubuf + imu->len). io_import_fixed() then computes offset == imu->len, which causes the bvec skip logic to advance past the last bio_vec entry and read bv_offset from out-of-bounds slab memory.
Return early from io_import_fixed() when len is zero. A zero-length import has no data to transfer and should not walk the bvec array at all.
Detalles técnicos trazas, registros y código del informe original
BUG: KASAN: slab-out-of-bounds in io_import_reg_buf+0x697/0x7f0 Read of size 4 at addr ffff888002bcc254 by task poc/103 Call Trace: io_import_reg_buf+0x697/0x7f0 io_write_fixed+0xd9/0x250 __io_issue_sqe+0xad/0x710 io_issue_sqe+0x7d/0x1100 io_submit_sqes+0x86a/0x23c0 __do_sys_io_uring_enter+0xa98/0x1590 Allocated by task 103: The buggy address is located 12 bytes to the right of allocated 584-byte region [ffff888002bcc000, ffff888002bcc248)
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Puntuación base: 7.1
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- 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
T1005Data from Local Systemcollection75 %
Vulnerabilidad local (AV:L/PR:L) que permite leer memoria fuera de límites (slab-out-of-bounds) sin requerir interacción del usuario. El acceso a memoria no autorizada es escalada de privilegios en el kernel.
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-125
Referencias
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/rsrc: reject zero-length fixed buffer import\n\nvalidate_fixed_range() admits buf_addr at the exact end of the\nregistered region when len is zero, because the check uses strict\ngreater-than (buf_end > imu->ubuf + imu->len). io_import_fixed()\nthen computes offset == imu->len, which causes the bvec skip logic\nto advance past the last bio_vec entry and read bv_offset from\nout-of-bounds slab memory.\n\nReturn early from io_import_fixed() when len is zero. A zero-length\nimport has no data to transfer and should not walk the bvec array\nat all.\n\n BUG: KASAN: slab-out-of-bounds in io_import_reg_buf+0x697/0x7f0\n Read of size 4 at addr ffff888002bcc254 by task poc/103\n Call Trace:\n io_import_reg_buf+0x697/0x7f0\n io_write_fixed+0xd9/0x250\n __io_issue_sqe+0xad/0x710\n io_issue_sqe+0x7d/0x1100\n io_submit_sqes+0x86a/0x23c0\n __do_sys_io_uring_enter+0xa98/0x1590\n Allocated by task 103:\n The buggy address is located 12 bytes to the right of\n allocated 584-byte region [ffff888002bcc000, ffff888002bcc248)"
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