5.5
MEDIUM
CVSS 3.1
CVE-2026-64306
crypto: drbg - Fix returning success on failure in CTR_DRBG
Overview
Description
In the Linux kernel, the following vulnerability has been resolved: crypto: drbg - Fix returning success on failure in CTR_DRBG drbg_ctr_generate() sometimes returns success when it fails, leaving the output buffer uninitialized. Fix it.
Details
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Sept. 3, 2026, 4:06 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
Apply the kernel patch to fix DRBG failures and prevent uninitialized output.
- Apply the kernel patch for drbg_ctr_generate.
- Ensure output buffers are initialized.
- Verify patch implementation.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64306.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64306 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64306
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64306 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64306 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 03, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.212 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.178 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.145 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.96 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.39 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.1 up to (excluding) 5.10.261 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.12.44 up to (excluding) 3.13 Added Reference Type kernel.org: https://git.kernel.org/stable/c/074db6db03a0aaa78f05ca9d4838053713796665 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/23b8b188cb32e5531d0f8d3af9506f8959cb369e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/75597e8774f319152744d24e0683d9393540a951 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7b03312491f9fe6ba4d60c4023e7e61d2d1fed96 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a9e886f73dd717027028bb7e3bbca93601ecdfc7 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/bbbac12083eff489b35d848332f0dff311131344 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/cc42fb40171c249bb859071d81b4eb007398a0bc Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '074db6db03a0aaa78f05ca9d4838053713796665', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '7b03312491f9fe6ba4d60c4023e7e61d2d1fed96', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '75597e8774f319152744d24e0683d9393540a951', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': 'cc42fb40171c249bb859071d81b4eb007398a0bc', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': 'bbbac12083eff489b35d848332f0dff311131344', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '23b8b188cb32e5531d0f8d3af9506f8959cb369e', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': 'a9e886f73dd717027028bb7e3bbca93601ecdfc7', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b', 'versionType': 'git'}, {'status': 'affected', 'version': 'f60b0fa8bbddde66f1d197be07120264b555c84a', 'versionType': 'git'}, {'status': 'affected', 'version': '3.12.44', 'lessThan': '3.13', 'versionType': 'semver'}], 'programFiles': ['crypto/drbg.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['crypto/drbg.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '074db6db03a0aaa78f05ca9d4838053713796665', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '7b03312491f9fe6ba4d60c4023e7e61d2d1fed96', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '75597e8774f319152744d24e0683d9393540a951', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': 'cc42fb40171c249bb859071d81b4eb007398a0bc', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': 'bbbac12083eff489b35d848332f0dff311131344', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '23b8b188cb32e5531d0f8d3af9506f8959cb369e', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': 'a9e886f73dd717027028bb7e3bbca93601ecdfc7', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b', 'versionType': 'git'}, {'status': 'affected', 'version': 'f60b0fa8bbddde66f1d197be07120264b555c84a', 'versionType': 'git'}, {'status': 'affected', 'version': '3.12.44', 'lessThan': '3.13', 'versionType': 'semver'}], 'programFiles': ['crypto/drbg.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['crypto/drbg.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '074db6db03a0aaa78f05ca9d4838053713796665', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '7b03312491f9fe6ba4d60c4023e7e61d2d1fed96', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '75597e8774f319152744d24e0683d9393540a951', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': 'cc42fb40171c249bb859071d81b4eb007398a0bc', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': 'bbbac12083eff489b35d848332f0dff311131344', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '23b8b188cb32e5531d0f8d3af9506f8959cb369e', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': 'a9e886f73dd717027028bb7e3bbca93601ecdfc7', 'versionType': 'git'}, {'status': 'affected', 'version': 'cde001e4c3c3625c60b68a83eb1f1c2572dee07a', 'lessThan': '39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b', 'versionType': 'git'}, {'status': 'affected', 'version': 'f60b0fa8bbddde66f1d197be07120264b555c84a', 'versionType': 'git'}, {'status': 'affected', 'version': '3.12.44', 'lessThan': '3.13', 'versionType': 'semver'}], 'programFiles': ['crypto/drbg.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['crypto/drbg.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: crypto: drbg - Fix returning success on failure in CTR_DRBG drbg_ctr_generate() sometimes returns success when it fails, leaving the output buffer uninitialized. Fix it. Added Reference https://git.kernel.org/stable/c/074db6db03a0aaa78f05ca9d4838053713796665 Added Reference https://git.kernel.org/stable/c/23b8b188cb32e5531d0f8d3af9506f8959cb369e Added Reference https://git.kernel.org/stable/c/39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b Added Reference https://git.kernel.org/stable/c/75597e8774f319152744d24e0683d9393540a951 Added Reference https://git.kernel.org/stable/c/7b03312491f9fe6ba4d60c4023e7e61d2d1fed96 Added Reference https://git.kernel.org/stable/c/a9e886f73dd717027028bb7e3bbca93601ecdfc7 Added Reference https://git.kernel.org/stable/c/bbbac12083eff489b35d848332f0dff311131344 Added Reference https://git.kernel.org/stable/c/cc42fb40171c249bb859071d81b4eb007398a0bc
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.