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CVE-2022-32792 is an out-of-bounds write vulnerability in WebKit's JavaScriptCore engine, specifically in the B3ReduceStrength optimization phase used by the FTL JIT pipeline. The bug was caused by incorrect integer range analysis for sign-extension operations (SExt8, SExt16, SExt32). Before the fix, the rangeFor logic effectively treated sign extension as preserving the child value's range, which is incorrect when the value crosses a signed boundary. As a result, B3ReduceStrength could incorrectly conclude that arithmetic operations such as CheckAdd, CheckSub, or CheckMul could not overflow or underflow and would replace checked operations with unchecked ones. Apple fixed the issue by improving input validation and, in WebKit, by introducing IntRange::sExt so rangeFor correctly models sign extension. Public analysis showed this logic flaw could be turned into an Int32 underflow, then into a bounds-check bypass and ultimately an out-of-bounds array access in JIT-compiled JavaScript triggered by maliciously crafted web content.
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An out-of-bounds write vulnerability in Safari/WebKit JavaScriptCore's B3ReduceStrength optimization logic caused by incorrect range analysis for sign extension (SExt) operations, which can wrongly eliminate overflow checks and enable OOB access during JIT-compiled JavaScript execution.
An out-of-bounds write vulnerability in Safari/WebKit JavaScriptCore caused by incorrect range analysis for sign extension operations in the B3ReduceStrength optimization phase, which can wrongly remove overflow/underflow checks and enable OOB access.
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Cross-references every affected SKU, including bundled OEM variants.
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