SECUFOCUSNOW
Home›CVE index›CVE-2026-64319
Review reviewCritical

CVE-2026-64319

Linux

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...

CVSS
9.1
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.1

Vulnerability overview

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...

Affected product and versions

Product
Linux
Affected versions
>= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0, >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 999f6205ede984a786f35f727b01f971b98e215d, >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 6d7649c1231dac14d906985d2936967e23041c26, >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < caa71b3a43ea5c13fe7141cb019ebcb03b8ac857, >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 3a413ece2504c70aa34a20be4dafec04e8c741f9, >= 6.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CWE
Not available