CVE-2026-64316

Key disclosure via CAAM debug hex dumps

Published Jul 25, 2026 · Updated Jul 25, 2026

Information disclosure in the Linux Kernel CAAM driver allows local users to read cryptographic keys from kernel debug output. The *_setkey() and gen_split_key() paths pass sensitive key buffers to print_hex_dump_debug(), which emits them when dynamic debug is enabled. Exploitation requires CONFIG_DYNAMIC_DEBUG, enabled CAAM debug call sites, and local access to the resulting kernel log; no write or service-interruption impact is reported.

CVSS severity4.7
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux Kernel CAAM driver allows local users to read cryptographic keys from kernel debug output. The *_setkey() and gen_split_key() paths pass sensitive key buffers to print_hex_dump_debug(), which emits them when dynamic debug is enabled. Exploitation requires CONFIG_DYNAMIC_DEBUG, enabled CAAM debug call sites, and local access to the resulting kernel log; no write or service-interruption impact is reported.

The record

CVE
CVE-2026-64316
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.3
  2. Affected versionversion=6e005503199b9bf1b385949c05897fd6567b5af4 <3f57657b6ea23f933371f2c2846322f441773cee
  3. Affected versionversion=6e005503199b9bf1b385949c05897fd6567b5af4 <45c0e3615e5bca5f1fc93357af8d19975c092d4f
  4. Affected versionversion=6e005503199b9bf1b385949c05897fd6567b5af4 <6f7b8e0321f3a8fbbd267d2ac15c671ab59e919e
  5. Affected versionversion=6e005503199b9bf1b385949c05897fd6567b5af4 <8b56ba10105ca34a4b75f7e33d41d96a63815591
  6. Affected versionversion=6e005503199b9bf1b385949c05897fd6567b5af4 <8cf5fb0503129e53052fe29302379cf83891d0fb
  7. Affected versionversion=6e005503199b9bf1b385949c05897fd6567b5af4 <9a53dc0a0ae0486e164e5af3de5f99ab42c5a23e
  8. Affected versionversion=6e005503199b9bf1b385949c05897fd6567b5af4 <cea7302d5d05df74cfb4107897b1ca34163c06b9
  9. Affected versionversion=6e005503199b9bf1b385949c05897fd6567b5af4 <ebd37eef6e4f435e18829c0c0c9ba3a6618cb2dd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.3; version=6e005503199b9bf1b385949c05897fd6567b5af4 <3f57657b6ea23f933371f2c2846322f441773cee; version=6e005503199b9bf1b385949c05897fd6567b5af4 <45c0e3615e5bca5f1fc93357af8d19975c092d4f; version=6e005503199b9bf1b385949c05897fd6567b5af4 <6f7b8e0321f3a8fbbd267d2ac15c671ab59e919e; version=6e005503199b9bf1b385949c05897fd6567b5af4 <8b56ba10105ca34a4b75f7e33d41d96a63815591; version=6e005503199b9bf1b385949c05897fd6567b5af4 <8cf5fb0503129e53052fe29302379cf83891d0fb; version=6e005503199b9bf1b385949c05897fd6567b5af4 <9a53dc0a0ae0486e164e5af3de5f99ab42c5a23e; version=6e005503199b9bf1b385949c05897fd6567b5af4 <cea7302d5d05df74cfb4107897b1ca34163c06b9; version=6e005503199b9bf1b385949c05897fd6567b5af4 <ebd37eef6e4f435e18829c0c0c9ba3a6618cb2dd

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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