CVE-2024-53148 Information

Description

In the Linux kernel the following vulnerability has been resolved:

comedi: Flush partial mappings in error case

If some remap_pfn_range() calls succeeded before one failed we still have buffer pages mapped into the userspace page tables when we drop the buffer reference with comedi_buf_map_put(bm). The userspace mappings are only cleaned up later in the mmap error path.

Fix it by explicitly flushing all mappings in our VMA on the error path.

See commit 79a61cc3fc04 (\mm: avoid leaving partial pfn mappings around in error case).

Reference

https://git.kernel.org/stable/c/16c507df509113c037cdc0ba642b9ab3389bd26c https://git.kernel.org/stable/c/297f14fbb81895f4ccdb0ad25d196786d6461e00 https://git.kernel.org/stable/c/57f048c2d205b85e34282a9b0b0ae177e84c2f44 https://git.kernel.org/stable/c/8797b7712de704dc231f9e821d8eb3b9aeb3a032 https://git.kernel.org/stable/c/9b07fb464eb69a752406e78e62ab3a60bfa7b00d https://git.kernel.org/stable/c/b9322408d83accc8b96322bc7356593206288c56 https://git.kernel.org/stable/c/c6963a06ce5c61d3238751ada04ee1569663a828 https://git.kernel.org/stable/c/ce8f9fb651fac95dd41f69afe54d935420b945bd