CVEs-PoC/2021/CVE-2021-45868.md

CVE-2021-45868

Description

In the Linux kernel before 5.15.3, fs/quota/quota_tree.c does not validate the block number in the quota tree (on disk). This can, for example, lead to a kernel/locking/rwsem.c use-after-free if there is a corrupted quota file.

POC

Reference

• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.3
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9bf3d20331295b1ecb81f4ed9ef358c51699a050
• https://www.openwall.com/lists/oss-security/2022/03/17/1
• https://www.openwall.com/lists/oss-security/2022/03/17/2

Github

• https://github.com/ARPSyndicate/cvemon