GHSA-78P6-7RPH-CP36
Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-27 06:30In 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) + 2hl + dhvlen <= tl before any access to the variable-length fields.
Discovered by Atuin - Automated Vulnerability Discovery Engine.
{
"affected": [],
"aliases": [
"CVE-2026-64319"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-25T10:17:13Z",
"severity": "CRITICAL"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-auth: validate reply message payload bounds against transfer length\n\nnvmet_auth_reply() accesses the variable-length rval[] array using\nattacker-controlled hl (hash length) and dhvlen (DH value length) fields\nwithout verifying they fit within the allocated buffer of tl bytes.\n\nA malicious NVMe-oF initiator can craft a DHCHAP_REPLY message with a\nsmall transfer length but large hl/dhvlen values, causing out-of-bounds\nheap reads when the target processes the DH public key (rval + 2*hl) or\nperforms the host response memcmp.\n\nWith DH authentication configured, the OOB pointer is passed directly to\nsg_init_one() and read by crypto_kpp_compute_shared_secret(), reaching\nup to 526 bytes past the buffer. This is exploitable pre-authentication.\n\nAdd bounds validation ensuring sizeof(*data) + 2*hl + dhvlen \u003c= tl before\nany access to the variable-length fields.\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine.",
"id": "GHSA-78p6-7rph-cp36",
"modified": "2026-07-27T06:30:32Z",
"published": "2026-07-25T12:31:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64319"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3a413ece2504c70aa34a20be4dafec04e8c741f9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6d7649c1231dac14d906985d2936967e23041c26"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/999f6205ede984a786f35f727b01f971b98e215d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/caa71b3a43ea5c13fe7141cb019ebcb03b8ac857"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.