CVE-2023-53804

Summary

In the Linux kernel, the following vulnerability has been resolved:

nilfs2: fix use-after-free bug of nilfs_root in nilfs_evict_inode()

During unmount process of nilfs2, nothing holds nilfs_root structure after nilfs2 detaches its writer in nilfs_detach_log_writer(). However, since nilfs_evict_inode() uses nilfs_root for some cleanup operations, it may cause use-after-free read if inodes are left in "garbage_list" and released by nilfs_dispose_list() at the end of nilfs_detach_log_writer().

Fix this issue by modifying nilfs_evict_inode() to only clear inode without additional metadata changes that use nilfs_root if the file system is degraded to read-only or the writer is detached.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe912a5b66837ee89fb025e67b5efeaa11930c2ce < f31e18131ee2ce80a4da5c808221d25b1ae9ad6daffected
LinuxLinuxe912a5b66837ee89fb025e67b5efeaa11930c2ce < 2a782ea8ebd712a458466e3103e2881b4f886cb5affected
LinuxLinuxe912a5b66837ee89fb025e67b5efeaa11930c2ce < 116d53f09ff52e6f98e3fe1f85d8898d6ba26c68affected
LinuxLinuxe912a5b66837ee89fb025e67b5efeaa11930c2ce < 6b4205ea97901f822004e6c8d59484ccfda03faaaffected
LinuxLinuxe912a5b66837ee89fb025e67b5efeaa11930c2ce < b8427b8522d9ede53015ba45a9978ba68d1162f5affected
LinuxLinuxe912a5b66837ee89fb025e67b5efeaa11930c2ce < acc2a40e428f12780004e1e9fce4722d88f909fdaffected
LinuxLinuxe912a5b66837ee89fb025e67b5efeaa11930c2ce < fb8e8d58f116d069e5939e1f786ac84e7fa4533eaffected
LinuxLinuxe912a5b66837ee89fb025e67b5efeaa11930c2ce < 9b5a04ac3ad9898c4745cba46ea26de74ba56a8eaffected
LinuxLinux2.6.37affected
LinuxLinux0 < 2.6.37unaffected
LinuxLinux4.14.316 <= 4.14.*unaffected
LinuxLinux4.19.284 <= 4.19.*unaffected
LinuxLinux5.4.244 <= 5.4.*unaffected
LinuxLinux5.10.181 <= 5.10.*unaffected
LinuxLinux5.15.113 <= 5.15.*unaffected
LinuxLinux6.1.30 <= 6.1.*unaffected
LinuxLinux6.3.4 <= 6.3.*unaffected
LinuxLinux6.4 <= *unaffected

Weaknesses

References