High [CVE-2026-64319] validate reply message payload bounds against transfer length
This high-severity Red Hat Linux advisory covers CVE-2026-64319 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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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.
A remote attacker, by sending a specially crafted NVMe-oF (NVMe over Fabrics) authentication reply message, can cause an out-of-bounds read in the kernel's memory. Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).
Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 26 days ago·verify at source
- kernel-0:6.12.0-211.52.1.el10_2
- kernel-0:5.14.0-687.45.1.el9_8
- RHSA-2026:64775
- RHSA-2026:64808
Official advisory · high-confidence parse· fetched 26 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.52.1.el10_2, kernel-0:5.14.0-687.45.1.el9_8, RHSA-2026:64775, RHSA-2026:64808. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 26 days ago·verify at source
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