Gracia@straceX
Patch
This pattern has appeared in real-world vulnerabilities. In CVE-2009-1897 in the Linux kernel: a null check placed after a dereference can become ineffective under optimization. combined with mmap of the zero page, this enabled local privilege escalation. Fix: reorder the dereference below the check.
Post summary
CVE-2009-1897 is a Linux kernel null-check optimization flaw enabling local privilege escalation. The recommended mitigation is to reorder the dereference so the null check occurs before the dereference, effectively patching the vulnerability.
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