CVE-2025-38688
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: iommufd: Prevent ALIGN() overflow When allocating IOVA the candidate range gets aligned to the target alignment. If the range is close to ULONG_MAX then the ALIGN() can wrap resulting in a corrupted iova. Open code the ALIGN() using get_add_overflow() to prevent this. This simplifies the checks as we don't need to check for length earlier either. Consolidate the two copies of this code under a single helper. This bug would allow userspace to create a mapping that overlaps with some other mapping or a reserved range.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-04 16:15:36.863000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
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"published": "2025-09-04T16:15:36.863",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Prevent ALIGN() overflow\n\nWhen allocating IOVA the candidate range gets aligned to the target\nalignment. If the range is close to ULONG_MAX then the ALIGN() can\nwrap resulting in a corrupted iova.\n\nOpen code the ALIGN() using get_add_overflow() to prevent this.\nThis simplifies the checks as we don't need to check for length earlier\neither.\n\nConsolidate the two copies of this code under a single helper.\n\nThis bug would allow userspace to create a mapping that overlaps with some\nother mapping or a reserved range."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niommufd: Prevenir desbordamiento de ALIGN()\n\nAl asignar IOVA, el rango candidato se alinea con la alineación objetivo. Si el rango está cerca de ULONG_MAX, entonces ALIGN() puede envolver, resultando en un iova corrupto.\n\nCodificar abiertamente ALIGN() usando get_add_overflow() para prevenir esto. Esto simplifica las comprobaciones, ya que tampoco necesitamos comprobar la longitud antes.\n\nConsolidar las dos copias de este código bajo una única función auxiliar.\n\nEste error permitiría al espacio de usuario crear una asignación que se superpone con alguna otra asignación o un rango reservado."
}
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