Answer in brief
CVE-2026-64319 records a Critical severity (CVSS 9.1) vulnerability in nvmet-auth: validate reply message payload bounds against transfer length. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=db1312dd95488b5e6ff362ff66fcf953a46b1821 <80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0 || >=db1312dd95488b5e6ff362ff66fcf953a46b1821 <999f6205ede984a786f35f727b01f971b98e215d || >=db1312dd95488b5e6ff362ff66fcf953a46b1821 <6d7649c1231dac14d906985d2936967e23041c26 || >=db1312dd95488b5e6ff362ff66fcf953a46b1821 <caa71b3a43ea5c13fe7141cb019ebcb03b8ac857 || >=db1312dd95488b5e6ff362ff66fcf953a46b1821 <3a413ece2504c70aa34a20be4dafec04e8c741f9 | 80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0, 999f6205ede984a786f35f727b01f971b98e215d, 6d7649c1231dac14d906985d2936967e23041c26, caa71b3a43ea5c13fe7141cb019ebcb03b8ac857, 3a413ece2504c70aa34a20be4dafec04e8c741f9 |
| Linux/Linuxgeneric | 6.0 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.