{"id":"CVE-2026-90230","published":"2026-09-17T17:17:18.803","lastModified":"2026-09-18T18:17:47.987","description":"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 (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.","cvssScore":9.1,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/5bb96cc218835769ab74ec7f3ea2bf81fbffe955","tags":[]},{"url":"https://git.kernel.org/stable/c/7b81e4d2230e3d2d372c826180c4ef0efc244f31","tags":[]},{"url":"https://git.kernel.org/stable/c/89ff11b72f38976f3b5aea23a5228ee05e277209","tags":[]},{"url":"https://git.kernel.org/stable/c/aaac783950b17c57df9b6f7344747cacb1a407ed","tags":[]},{"url":"https://git.kernel.org/stable/c/c38a8186326799957d293d370136c128cd113916","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The flaw allows a malicious host to perform a heap out-of-bounds read by misreporting the transfer length or hash/dh group identifiers, potentially leading to information disclosure.","exploitability":"Exploitation is moderately difficult requiring a non-conformant host with control over the transfer length or hash/dh group identifiers.","blast_radius":"If exploited, the vulnerability could lead to sensitive information disclosure, impacting system security and integrity.","remediation":"Upgrade to the Linux kernel version 6.1.17 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["heap-overflow","information-disclosure","kernel","linux"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-28T09:07:02.113Z"}}