{"id":"CVE-2026-90230","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()\n\nnvmet_execute_auth_send() allocates the DH-HMAC-CHAP message buffer with\nthe host-supplied transfer length…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()\n\nnvmet_execute_auth_send() allocates the DH-HMAC-CHAP message buffer with\nthe host-supplied transfer length…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 89ff11b72f38976f3b5aea23a5228ee05e277209","Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < aaac783950b17c57df9b6f7344747cacb1a407ed","Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < c38a8186326799957d293d370136c128cd113916","Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 7b81e4d2230e3d2d372c826180c4ef0efc244f31","Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 5bb96cc218835769ab74ec7f3ea2bf81fbffe955","Linux 6.0"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:47.987","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90230","references":[{"url":"https://git.kernel.org/stable/c/5bb96cc218835769ab74ec7f3ea2bf81fbffe955","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7b81e4d2230e3d2d372c826180c4ef0efc244f31","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/89ff11b72f38976f3b5aea23a5228ee05e277209","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/aaac783950b17c57df9b6f7344747cacb1a407ed","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c38a8186326799957d293d370136c128cd113916","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00457,"epssPercentile":0.38851,"ingestedAt":"2026-09-17T16:21:47.852Z","slug":"CVE-2026-90230","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()\n\nnvmet_execute_auth_send() allocates the DH-HMAC-CHAP message buffer with\nthe host-supplied transfer length (tl) and hands it to\nnvmet_auth_negotiate() without passing tl along. nvmet_auth_negotiate()\nthen reads the negotiate header and, for each of the halen hash\nidentifiers and dhlen DH group identifiers, indexes into the fixed\nidlist[60] array (hashes at idlist[0..halen), groups at idlist[30..]).\n\nNeither the transfer length nor halen/dhlen is validated. A malicious or\nnon-conformant host can report a tl smaller than the negotiate structure,\nor a halen/dhlen larger than the array (both are u8, up to 255), making\nthe loops read past the end of the allocated buffer (heap out-of-bounds\nread). The sibling nvmet_auth_reply() already validates tl against the\nstructure size; the negotiate path did not.\n\nPass tl into nvmet_auth_negotiate(), reject a tl that does not cover the\nnegotiate data plus one full protocol descriptor, and reject halen/dhlen\nlarger than NVME_AUTH_DHCHAP_MAX_DH_IDS.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":207197,"id":"CVE-2026-90230","ts":1789757339546,"field":"cvss","old":null,"new":"9.1"},{"seq":207196,"id":"CVE-2026-90230","ts":1789757339546,"field":"severity","old":"none","new":"critical"}]}