macOS kernel memory disclosure via bounds check flaw (before Sequoia 15.7.8)
CVE-2026-64776 Published on July 27, 2026
The issue was addressed with improved bounds checks. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to disclose kernel memory.
Vulnerability Analysis
CVE-2026-64776 is exploitable with local system access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
Products Associated with CVE-2026-64776
stack.watch emails you whenever new vulnerabilities are published in Apple macOS or Apple Macos Sonoma. Just hit a watch button to start following.
Affected Versions
Apple macOS:- Before 14.8.8 is affected.
- Before 15.7.8 is affected.
- Before 26.6 is affected.