CVE-2024-26601 Information

Description

In the Linux kernel the following vulnerability has been resolved:

ext4: regenerate buddy after block freeing failed if under fc replay

This mostly reverts commit 6bd97bf273bd (xt4: remove redundant mb_regenerate_buddy()) and reintroduces mb_regenerate_buddy(). Based on code in mb_free_blocks() fast commit replay can end up marking as free blocks that are already marked as such. This causes corruption of the buddy bitmap so we need to regenerate it in that case.

Reference

https://git.kernel.org/stable/c/78327acd4cdc4a1601af718b781eece577b6b7d4 https://git.kernel.org/stable/c/ea42d6cffb0dd27a417f410b9d0011e9859328cb https://git.kernel.org/stable/c/6b0d48647935e4b8c7b75d1eccb9043fcd4ee581 https://git.kernel.org/stable/c/c9b528c35795b711331ed36dc3dbee90d5812d4e