Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ublk: validate auto buf reg before taking uring_cmd With UBLK_F_AUTO_BUF_REG, invalid sqe->addr can fail after ublk_fill_io_cmd() has set UBLK_IO_FLAG_ACTIVE. The uring_cmd is completed while the tag stays active, which can hang teardown. Split validation from buffer apply so the check has no side effects, then take the uring_cmd and store the already-validated buffer. Apply the same order in FETCH so io->buf is not written before __ublk_fetch() state checks.
References
- https://git.kernel.org/stable/c/653d22269a8b83b491f7f186a5d7872f14e6ddca
- https://git.kernel.org/stable/c/ca5a01eee34c7cbe0f531a613b0292a3ad1a419b
FAQ
What is CVE-2026-90323?
CVE-2026-90323 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: ublk: validate auto buf reg before taking uring_cmd With UBLK_F_AUTO_BUF_REG, invalid sqe->addr can fail after ublk_fill_io_cmd() ...
How severe is CVE-2026-90323?
CVSS scoring is not yet available for CVE-2026-90323. Check NVD for updates.
Is there a patch for CVE-2026-90323?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.