CVE-2022-49995 Information

Jun 19, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

writeback: avoid use-after-free after removing device

When a disk is removed bdi_unregister gets called to stop further writeback and wait for associated delayed work to complete. However wb_inode_writeback_end() may schedule bandwidth estimation dwork after this has completed which can result in the timer attempting to access the just freed bdi_writeback.

Fix this by checking if the bdi_writeback is alive similar to when scheduling writeback work.

Since this requires wb->work_lock and wb_inode_writeback_end() may get called from interrupt switch wb->work_lock to an irqsafe lock.

Reference

https://git.kernel.org/stable/c/9a6c710f3bc10bc9cc23e1c080b53245b7f9d5b7 https://git.kernel.org/stable/c/f87904c075515f3e1d8f4a7115869d3b914674fd https://git.kernel.org/stable/c/f96b9f7c1676923bce871e728bb49c0dfa5013cc

CNNVD-202506-2282 (Published: 2025-06-18)

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