CVE-2026-90323
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.
Affected versions
Linux kernel versions
6.17
and later are affected. Fixed in
7.2.6,
7.3-rc1
and their respective stable series.
References
2 totalFrequently asked questions
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What is CVE-2026-90323?
CVE-2026-90323 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.17 onward and has been patched in 7.2.6 and 7.3-rc1. CVE-2026-90323 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-90323?
Yes. CVE-2026-90323 has been patched. Fixed versions include 7.2.6 and 7.3-rc1. If you are running Linux kernel 6.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-90323 actively exploited?
No. CVE-2026-90323 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.