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CVE-2018-13093
medium
Description
An issue was discovered in fs/xfs/xfs_icache.c in the Linux kernel through 4.17.3. There is a NULL pointer dereference and panic in lookup_slow() on a NULL inode->i_ops pointer when doing pathwalks on a corrupted xfs image. This occurs because of a lack of proper validation that cached inodes are free during allocation.
References
https://usn.ubuntu.com/4118-1/
https://usn.ubuntu.com/4094-1/
https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
https://github.com/torvalds/linux/commit/afca6c5b2595fc44383919fba740c194b0b76aff
https://bugzilla.kernel.org/show_bug.cgi?id=199367