CVE-2023-53820 in Kernel

Resumen (Inglés)

In the Linux kernel, the following vulnerability has been resolved:

loop: loop_set_status_from_info() check before assignment

In loop_set_status_from_info(), lo->lo_offset and lo->lo_sizelimit should
be checked before reassignment, because if an overflow error occurs, the
original correct value will be changed to the wrong value, and it will not
be changed back.

More, the original patch did not solve the problem, the value was set and
ioctl returned an error, but the subsequent io used the value in the loop
driver, which still caused an alarm:

loop_handle_cmd
do_req_filebacked
loff_t pos = ((loff_t) blk_rq_pos(rq) << 9) + lo->lo_offset;
lo_rw_aio
cmd->iocb.ki_pos = pos

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Responsable

Linux

Reservar

2025-12-09

Divulgación

2025-12-09

Estado

Confirmado

Voces

VulDB provides additional information and datapoints for this CVE:

ID	Vulnerabilidad	CWE	Exp	Con	CVE
334948	Linux Kernel loop loop_set_status_from_info desbordamiento de búfer	120	No está definido	Arreglo oficial	CVE-2023-53820

Fuentes

• MITRE
• NVD
• CVE Details