CVE-2019-1010022

Red Hat statement

Red Hat Product Security does not consider this to be a vulnerability. Also, the upstream project recognizes it as a hardening issue [1], they do not classify it as a security flaw. Here are some technical notes regarding the issue: The issue relates to a mitigation bypass in the GNU Libc library's NPTL component, allowing attackers to circumvent stack guard protection via a stack buffer overflow. However, this is considered a post-attack mitigation rather than a direct vulnerability. According to the glibc security process [2], an issue must meet specific criteria for direct exploitation to be deemed a security bug. In this case, the bypass of stack canary protection occurs by overwriting the stack_guard in the tcbhead_t structure, but only after a successful stack overflow attack. This issue does not directly lead to code execution. Instead, it weakens an additional layer of protection after an attack has already occurred, thus classifying it as a post-attack hardening issue. In summary, while the issue has security implications, it does not meet the criteria to be classified as a direct security vulnerability. [1] https://sourceware.org/bugzilla/show_bug.cgi?id=22850#c3 [2] https://sourceware.org/git/?p=glibc.git;a=blob;f=SECURITY.md