Quoting form the OpenSSL upstream advisory: Fix Use After Free for large message sizes (CVE-2016-6309) ========================================================== Severity: Critical This issue only affects OpenSSL 1.1.0a, released on 22nd September 2016. The patch applied to address CVE-2016-6307 resulted in an issue where if a message larger than approx 16k is received then the underlying buffer to store the incoming message is reallocated and moved. Unfortunately a dangling pointer to the old location is left which results in an attempt to write to the previously freed location. This is likely to result in a crash, however it could potentially lead to execution of arbitrary code. OpenSSL 1.1.0 users should upgrade to 1.1.0b This issue was reported to OpenSSL on 23rd September 2016 by Robert Święcki (Google Security Team), and was found using honggfuzz. The fix was developed by Matt Caswell of the OpenSSL development team. External References: https://www.openssl.org/news/secadv/20160926.txt
The CVE-2016-6307 is tracked via bug 1378203. Upstream commit: https://git.openssl.org/?p=openssl.git;a=commitdiff;h=acacbfa7565c78d2273c0b2a2e5e803f44afefeb The following commit seems to add test for this issue into upstream test suite: https://git.openssl.org/?p=openssl.git;a=commitdiff;h=f8644220a05f75d51bbde627077cdf336e4d4592 Statement: This issue did not affect any Red Hat product as they do not yet include OpenSSL 1.1.0.