{"id":"CVE-2026-90323","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nublk: validate auto buf reg before taking uring_cmd\n\nWith UBLK_F_AUTO_BUF_REG, invalid sqe->addr can fail after\nublk_fill_io_cmd() has set UBLK_IO_FLAG_ACTIVE","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nublk: validate auto buf reg before taking uring_cmd\n\nWith UBLK_F_AUTO_BUF_REG, invalid sqe->addr can fail after\nublk_fill_io_cmd() has set UBLK_IO_FLAG_ACTIVE. The urin…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 52460dda3a775a73f226312b43c0a0211e8665ea < 653d22269a8b83b491f7f186a5d7872f14e6ddca","Linux >= 52460dda3a775a73f226312b43c0a0211e8665ea < ca5a01eee34c7cbe0f531a613b0292a3ad1a419b","Linux 6.17"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:30.307","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90323","references":[{"url":"https://git.kernel.org/stable/c/653d22269a8b83b491f7f186a5d7872f14e6ddca","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ca5a01eee34c7cbe0f531a613b0292a3ad1a419b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.822Z","epss":0.00189,"epssPercentile":0.08804,"slug":"CVE-2026-90323","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nublk: validate auto buf reg before taking uring_cmd\n\nWith UBLK_F_AUTO_BUF_REG, invalid sqe->addr can fail after\nublk_fill_io_cmd() has set UBLK_IO_FLAG_ACTIVE. The uring_cmd is\ncompleted while the tag stays active, which can hang teardown.\n\nSplit validation from buffer apply so the check has no side effects,\nthen take the uring_cmd and store the already-validated buffer. Apply\nthe same order in FETCH so io->buf is not written before __ublk_fetch()\nstate checks.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}