Vulnerability-Lookup

CVE-2026-64319 (GCVE-0-2026-64319)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-27 04:59

Title

nvmet-auth: validate reply message payload bounds against transfer length

Summary

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.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/80cd28b56ab62d3e7…
https://git.kernel.org/stable/c/999f6205ede984a78…
https://git.kernel.org/stable/c/6d7649c1231dac14d…
https://git.kernel.org/stable/c/caa71b3a43ea5c13f…
https://git.kernel.org/stable/c/3a413ece2504c70aa…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < 80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0 (git) Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < 999f6205ede984a786f35f727b01f971b98e215d (git) Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < 6d7649c1231dac14d906985d2936967e23041c26 (git) Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < caa71b3a43ea5c13fe7141cb019ebcb03b8ac857 (git) Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < 3a413ece2504c70aa34a20be4dafec04e8c741f9 (git)
Linux	Linux	Affected: 6.0 Unaffected: 0 , < 6.0 (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

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          "cvssV3_1": {
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    "dateReserved": "2026-07-19T15:36:31.780Z",
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      "cve": "CVE-2026-64319",
      "id": "CVE-2026-64319",
      "initial_release_date": "2026-07-25T16:45:49Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64319",
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}

GHSA-78P6-7RPH-CP36

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-27 06:30

Details

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) + 2hl + dhvlen <= tl before any access to the variable-length fields.

Discovered by Atuin - Automated Vulnerability Discovery Engine.

Severity

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "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

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64319 (GCVE-0-2026-64319)

GHSA-78P6-7RPH-CP36

Tags

Sightings

Nomenclature