CVE-2026-90230

In the Linux kernel, the following vulnerability has been resolved:

nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()

nvmet_execute_auth_send() allocates the DH-HMAC-CHAP message buffer with

the host-supplied transfer length (tl) and hands it to

nvmet_auth_negotiate() without passing tl along. nvmet_auth_negotiate()

then reads the negotiate header and, for each of the halen hash

identifiers and dhlen DH group identifiers, indexes into the fixed

idlist[60] array (hashes at idlist[0..halen), groups at idlist[30..]).

Neither the transfer length nor halen/dhlen is validated. A malicious or

non-conformant host can report a tl smaller than the negotiate structure,

or a halen/dhlen larger than the array (both are u8, up to 255), making

the loops read past the end of the allocated buffer (heap out-of-bounds

read). The sibling nvmet_auth_reply() already validates tl against the

structure size; the negotiate path did not.

Pass tl into nvmet_auth_negotiate(), reject a tl that does not cover the

negotiate data plus one full protocol descriptor, and reject halen/dhlen

larger than NVME_AUTH_DHCHAP_MAX_DH_IDS.