CVE-2026-64306: linux
CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-64306DEBIAN-CVE-2026-64306
Published 25-07-2026Last modified 17-08-2026
Vulnerability summary
CVE-2026-64306 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.7% of scored vulnerabilities.
CVSS score
5.5/10
010
Medium · v3.1 (NVD)EPSS score
0.16%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 32 · Related 32OPENSUSE-SU-2026:11476-1OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1SUSE-SU-2026:23528-1SUSE-SU-2026:23529-1SUSE-SU-2026:23881-1SUSE-SU-2026:23887-1SUSE-SU-2026:23897-1SUSE-SU-2026:23902-1SUSE-SU-2026:4120-1SUSE-SU-2026:4254-1SUSE-SU-2026:4282-1USN-8726-1USN-8726-2USN-8726-3USN-8726-4USN-8727-1USN-8728-1USN-8728-2USN-8728-3USN-8760-1USN-8760-2USN-8800-1USN-8875-1USN-8875-2USN-8876-1USN-8877-1USN-8878-1USN-8879-1USN-8917-1USN-8918-1
Timeline
- 25-07-2026PublishedVulnerability first disclosed.
- 17-08-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 3 sources · 1 versionMedium 5.5Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
5%
Versus all other CVEs
30-day change
0.00 pp
From 0.16% on 21-09-2026
21-09-202621-10-2026
EPSS score0.16%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu169 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.180-1 | < 6.12.96-1 | < 7.1.4-1
- linux-6.12< 6.12.100-1~deb12u1
Linux2 products
- linux≥ cde001e4c3c3625c60b68a83eb1f1c2572dee07a, < 074db6db03a0aaa78f05ca9d4838053713796665 | ≥ cde001e4c3c3625c60b68a83eb1f1c2572dee07a, < 7b03312491f9fe6ba4d60c4023e7e61d2d1fed96 | ≥ cde001e4c3c3625c60b68a83eb1f1c2572dee07a, < 75597e8774f319152744d24e0683d9393540a951 | ≥ cde001e4c3c3625c60b68a83eb1f1c2572dee07a, < cc42fb40171c249bb859071d81b4eb007398a0bc | ≥ cde001e4c3c3625c60b68a83eb1f1c2572dee07a, < bbbac12083eff489b35d848332f0dff311131344 | ≥ cde001e4c3c3625c60b68a83eb1f1c2572dee07a, < 23b8b188cb32e5531d0f8d3af9506f8959cb369e | ≥ cde001e4c3c3625c60b68a83eb1f1c2572dee07a, < a9e886f73dd717027028bb7e3bbca93601ecdfc7 | ≥ cde001e4c3c3625c60b68a83eb1f1c2572dee07a, < 39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b | f60b0fa8bbddde66f1d197be07120264b555c84a | ≥ 3.12.44, < 3.13 | 4.1
- linux_kernel≥ 3.12.44, < 3.13 | ≥ 4.1, < 5.10.261 | ≥ 5.11, < 5.15.212 | ≥ 5.16, < 6.1.178 | ≥ 6.2, < 6.6.145 | ≥ 6.7, < 6.12.96 | ≥ 6.13, < 6.18.39 | ≥ 6.19, < 7.1.4
3 vendors · 173 products
