CVE-2026-90009
High
Description
In the Linux kernel, the following vulnerability has been resolved: scsi: bsg: Fix TOCTOU in io_uring passthrough command setup scsi_bsg_uring_cmd() reads bsg_uring_cmd from the shared mmap'd SQE. Userspace can change a field after we check it and before we use it. request_len is the sharp case: it can grow past sizeof(scmd->cmnd) after the bound check and overflow scmd->cmnd in copy_from_user(). READ_ONCE() the SQE fields we check or use into locals before use.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux
PublishedSep 16, 2026
First seenSep 16, 2026
How to fix
Update
- Linux Linuxf033530105aa73d82c121d54b57f358e4865d2f4, 4b3c5965fca99f62d31c963294bd5b23cc488e97 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 7b6d3255e7f8c6df2d21504c47808e3ce84649ac ≤ v < f033530105aa73d82c121d54b57f358e4865d2f4, 7b6d3255e7f8c6df2d21504c47808e3ce84649ac ≤ v < 4b3c5965fca99f62d31c963294bd5b23cc488e97, 7.1 | f033530105aa73d82c121d54b57f358e4865d2f4, 4b3c5965fca99f62d31c963294bd5b23cc488e97 |
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