Bug 2355785 (CVE-2025-30211)

Summary: CVE-2025-30211 erlang: KEX init error results with excessive memory usage
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: eglynn, jjoyce, jschluet, lhh, lsvaty, mburns, mgarciac, pgrist
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Erlang/OTP. This vulnerability allows an attacker to cause high memory consumption via a maliciously crafted KEX init message that exceeds RFC-specified limits on algorithm names.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2356153, 2356154, 2356155, 2356156    
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Description OSIDB Bzimport 2025-03-28 15:01:22 UTC
Erlang/OTP is a set of libraries for the Erlang programming language. Prior to versions OTP-27.3.1, 26.2.5.10, and 25.3.2.19, a maliciously formed KEX init message can result with high memory usage. Implementation does not verify RFC specified limits on algorithm names (64 characters) provided in KEX init message. Big KEX init packet may lead to inefficient processing of the error data. As a result, large amount of memory will be allocated for processing malicious data. Versions OTP-27.3.1, OTP-26.2.5.10, and OTP-25.3.2.19 fix the issue. Some workarounds are available. One may set option `parallel_login` to `false` and/or reduce the `max_sessions` option.