SB20260727264 - Always-Incorrect Control Flow Implementation in Linux kernel crypto
Published: July 27, 2026
Security Bulletin ID
SB20260727264
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-64312)
CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper callback handling in the pcrypt aead fallback path in crypto/pcrypt.c when processing non-parallel fallback after padata submission returns -EBUSY. A local user can trigger asynchronous cryptographic operations that use the fallback path to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/3920c5f6edc341729d20d0507e466c6d3b11f372
- https://git.kernel.org/stable/c/4711ca06bd169a2cbc9cc59a6de2ed512c41a880
- https://git.kernel.org/stable/c/81ce16d938db9b88cdc231522c0358395ae8c6b5
- https://git.kernel.org/stable/c/82789a44415e3e31168229421b138278dfb16412
- https://git.kernel.org/stable/c/83fa1397d5853de1e27dd52ec44b068ff358ca18
- https://git.kernel.org/stable/c/ae93c5b3e2a2968b56d772ca1d06615927b7cc36
- https://git.kernel.org/stable/c/c4bd2f4c35b0e15b6040c2f7e7e7986780c066cf
- https://git.kernel.org/stable/c/ed459fe319376e876de433d12b6c6772e612ca36