Bug 2338871 (CVE-2025-0577)

Summary: CVE-2025-0577 glibc: vDSO getrandom acceleration may return predictable randomness
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: ashankar, codonell, dj, fweimer, pfrankli, security-response-team
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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An insufficient entropy vulnerability was found in glibc. The getrandom and arc4random family of functions may return predictable randomness if these functions are called again after the fork, which happens concurrently with a call to any of these functions.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2341852, 2341853    
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Description OSIDB Bzimport 2025-01-19 15:39:41 UTC 
In Fedora 40 glibc between glibc-2.39-28.fc40 and glibc-2.39-33.fc40 (inclusive) and in Fedora 41 glibc between glibc-2.40-12.fc41 and glibc-2.40-17.fc41, the vDSO getrandom acceleration (impacting getrandom and the arc4random family of functions) may return predictable randomness if these functions are called again after fork that happened concurrently with a call to any of these functions. 

The issue currently impacts CentOS 10 Stream (glibc-2.39-29.el10 to glibc-2.39-33.el10).

No glibc upstream release is impacted, this was caught during glibc 2.41 development.