Bug 2430377 (CVE-2025-15468)

Summary: CVE-2025-15468 openssl: OpenSSL: Denial of Service via NULL pointer dereference in QUIC protocol handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: csutherl, jclere, pjindal, plodge, security-response-team, szappis, vchlup
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in openssl. A remote attacker could trigger a NULL pointer dereference by sending an unknown or unsupported cipher ID during the client hello callback in applications using the QUIC (Quick UDP Internet Connections) protocol. This vulnerability, occurring when the SSL_CIPHER_find() function is called in this specific context, leads to an abnormal termination of the running process, causing a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Deadline: 2026-01-27   

Description OSIDB Bzimport 2026-01-16 14:28:38 UTC 
A NULL pointer dereference leads to abnormal termination of
the running process causing Denial of Service.

Some applications call SSL_CIPHER_find() from the client_hello_cb callback
on the cipher ID received from the peer. If this is done with an SSL object
implementing the QUIC protocol, NULL pointer dereference will happen if
the examined cipher ID is unknown or unsupported.

As it is not very common to call this function in applications using the QUIC
protocol and the worst outcome is Denial of Service, the issue was assessed
as Low severity.

The vulnerable code was introduced in the 3.2 version with the addition
of the QUIC protocol support.

The FIPS modules in 3.6, 3.5, 3.4 and 3.3 are not affected by this issue,
as the QUIC implementation is outside the OpenSSL FIPS module boundary.

OpenSSL 3.6, 3.5, 3.4 and 3.3 are vulnerable to this issue.

OpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue.

OpenSSL 3.6 users should upgrade to OpenSSL 3.6.1.

OpenSSL 3.5 users should upgrade to OpenSSL 3.5.5.

OpenSSL 3.4 users should upgrade to OpenSSL 3.4.4.

OpenSSL 3.3 users should upgrade to OpenSSL 3.3.6.
Comment 2 Jean-frederic Clere 2026-01-19 09:49:52 UTC 
JBCS/JWS are not yet supporting QUIC / HTTP3 so they are not affected.
Comment 3 errata-xmlrpc 2026-01-28 08:57:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:1472 https://access.redhat.com/errata/RHSA-2026:1472
Comment 4 errata-xmlrpc 2026-01-28 09:54:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:1473 https://access.redhat.com/errata/RHSA-2026:1473