Answer in brief
CVE-2026-64319 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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.
| 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
Aug 5, 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.
Answer in brief
CVE-2026-64319 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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.
| 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
Aug 5, 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.