CVE-2026-90009 is a vulnerability in Linux Kernel
Published on September 16, 2026
scsi: bsg: Fix TOCTOU in io_uring passthrough command setup
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.
Products Associated with CVE-2026-90009
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Affected Versions
Linux:- Version 7b6d3255e7f8c6df2d21504c47808e3ce84649ac and below f033530105aa73d82c121d54b57f358e4865d2f4 is affected.
- Version 7b6d3255e7f8c6df2d21504c47808e3ce84649ac and below 4b3c5965fca99f62d31c963294bd5b23cc488e97 is affected.
- Version 7.1 is affected.
- Before 7.1 is unaffected.
- Version 7.2.5, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.