CVE-2024-46852 (GCVE-0-2024-46852)
Vulnerability from cvelistv5
Published
2024-09-27 12:42
Modified
2026-08-05 11:39
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: dma-buf: heaps: Fix off-by-one in CMA heap fault handler Until VM_DONTEXPAND was added in commit 1c1914d6e8c6 ("dma-buf: heaps: Don't track CMA dma-buf pages under RssFile") it was possible to obtain a mapping larger than the buffer size via mremap and bypass the overflow check in dma_buf_mmap_internal. When using such a mapping to attempt to fault past the end of the buffer, the CMA heap fault handler also checks the fault offset against the buffer size, but gets the boundary wrong by 1. Fix the boundary check so that we don't read off the end of the pages array and insert an arbitrary page in the mapping.
References
Impacted products
Vendor Product Version
Linux Linux Version: a5d2d29e24be8967ef78a1b1fb2292413e3b3df9
Version: a5d2d29e24be8967ef78a1b1fb2292413e3b3df9
Version: a5d2d29e24be8967ef78a1b1fb2292413e3b3df9
Version: a5d2d29e24be8967ef78a1b1fb2292413e3b3df9
Version: a5d2d29e24be8967ef78a1b1fb2292413e3b3df9
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