Critical severity · published Jul 25, 2026
CVE-2026-64319
nvmet-auth: validate reply message payload bounds against transfer length
9.1
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
6.0 before 6.6.145; 6.7 before 6.12.96; 6.13 before 6.18.39; 6.19 before 7.1.4 · source: NVD
LI
Linux · Linux
db1312dd95488b5e6ff362ff66fcf953a46b1821 before 80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0; db1312dd95488b5e6ff362ff66fcf953a46b1821 before 999f6205ede984a786f35f727b01f971b98e215d; db1312dd95488b5e6ff362ff66fcf953a46b1821 before 6d7649c1231dac14d906985d2936967e23041c26; db1312dd95488b5e6ff362ff66fcf953a46b1821 before caa71b3a43ea5c13fe7141cb019ebcb03b8ac857; db1312dd95488b5e6ff362ff66fcf953a46b1821 before 3a413ece2504c70aa34a20be4dafec04e8c741f9; 6.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64319
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-64319
Patch
https://git.kernel.org/stable/c/3a413ece2504c70aa34a20be4dafec04e8c741f9
Patch
https://git.kernel.org/stable/c/6d7649c1231dac14d906985d2936967e23041c26
Patch
https://git.kernel.org/stable/c/80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0
Patch
https://git.kernel.org/stable/c/999f6205ede984a786f35f727b01f971b98e215d
Patch
https://git.kernel.org/stable/c/caa71b3a43ea5c13fe7141cb019ebcb03b8ac857
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