Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-64306
Published: July 27, 2026
Vulnerability identifier: #VU139676
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64306
CWE-ID: CWE-703
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to improper handling of error conditions in drbg_ctr_generate() when processing additional input during CTR_DRBG generation. A local user can trigger a failure in drbg_ctr_update() to disclose sensitive information.
The output buffer may remain uninitialized when the function incorrectly reports success.
Affected software
Linux kernel
How to mitigate CVE-2026-64306
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/074db6db03a0aaa78f05ca9d4838053713796665
- https://git.kernel.org/stable/c/23b8b188cb32e5531d0f8d3af9506f8959cb369e
- https://git.kernel.org/stable/c/39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b
- https://git.kernel.org/stable/c/75597e8774f319152744d24e0683d9393540a951
- https://git.kernel.org/stable/c/7b03312491f9fe6ba4d60c4023e7e61d2d1fed96
- https://git.kernel.org/stable/c/a9e886f73dd717027028bb7e3bbca93601ecdfc7
- https://git.kernel.org/stable/c/bbbac12083eff489b35d848332f0dff311131344
- https://git.kernel.org/stable/c/cc42fb40171c249bb859071d81b4eb007398a0bc