CVE-2026-64319
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk41th percentile - higher than 41% of all known CVEs
Summary
In the Linux kernel, the NVMe over Fabrics (nvmet-auth) subsystem has a vulnerability due to missing bounds validation of hl and dhvlen fields in the DHCHAP_REPLY message. An attacker can send a crafted message with a small transfer length but large hl/dhvlen values, leading to out-of-bounds heap read.
Risk Assessment
The vulnerability can be exploited pre-authentication, leading to kernel memory data leakage or potentially privilege escalation.
Recommendation
Immediately update the Linux kernel to a version containing the fix that validates sizeof(*data) + 2*hl + dhvlen <= tl before accessing variable-length fields.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: validate reply message payload bounds against transfer length nvmet_auth_reply() accesses the variable-length rval[] array using attacker-controlled hl (hash length) and dhvlen (DH value length) fields without verifying they fit within the allocated buffer of tl bytes. A malicious NVMe-oF initiator can craft a DHCHAP_REPLY message with a small transfer length but large hl/dhvlen values, causing out-of-bounds heap reads when the target processes the DH public key (rval + 2*hl) or performs the host response memcmp. With DH authentication configured, the OOB pointer is passed directly to sg_init_one() and read by crypto_kpp_compute_shared_secret(), reaching up to 526 bytes past the buffer. This is exploitable pre-authentication. Add bounds validation ensuring sizeof(*data) + 2*hl + dhvlen <= tl before any access to the variable-length fields. Discovered by Atuin - Automated Vulnerability Discovery Engine.