CVE-2023-53804
Description
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.
How to fix
- Linux Linuxf31e18131ee2ce80a4da5c808221d25b1ae9ad6d, 2a782ea8ebd712a458466e3103e2881b4f886cb5, 116d53f09ff52e6f98e3fe1f85d8898d6ba26c68, 6b4205ea97901f822004e6c8d59484ccfda03faa, b8427b8522d9ede53015ba45a9978ba68d1162f5, acc2a40e428f12780004e1e9fce4722d88f909fd, fb8e8d58f116d069e5939e1f786ac84e7fa4533e, 9b5a04ac3ad9898c4745cba46ea26de74ba56a8e or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | e912a5b66837ee89fb025e67b5efeaa11930c2ce ≤ v < f31e18131ee2ce80a4da5c808221d25b1ae9ad6d, e912a5b66837ee89fb025e67b5efeaa11930c2ce ≤ v < 2a782ea8ebd712a458466e3103e2881b4f886cb5, e912a5b66837ee89fb025e67b5efeaa11930c2ce ≤ v < 116d53f09ff52e6f98e3fe1f85d8898d6ba26c68, e912a5b66837ee89fb025e67b5efeaa11930c2ce ≤ v < 6b4205ea97901f822004e6c8d59484ccfda03faa, e912a5b66837ee89fb025e67b5efeaa11930c2ce ≤ v < b8427b8522d9ede53015ba45a9978ba68d1162f5, e912a5b66837ee89fb025e67b5efeaa11930c2ce ≤ v < acc2a40e428f12780004e1e9fce4722d88f909fd, e912a5b66837ee89fb025e67b5efeaa11930c2ce ≤ v < fb8e8d58f116d069e5939e1f786ac84e7fa4533e, e912a5b66837ee89fb025e67b5efeaa11930c2ce ≤ v < 9b5a04ac3ad9898c4745cba46ea26de74ba56a8e, 2.6.37 | f31e18131ee2ce80a4da5c808221d25b1ae9ad6d, 2a782ea8ebd712a458466e3103e2881b4f886cb5, 116d53f09ff52e6f98e3fe1f85d8898d6ba26c68, 6b4205ea97901f822004e6c8d59484ccfda03faa, b8427b8522d9ede53015ba45a9978ba68d1162f5, acc2a40e428f12780004e1e9fce4722d88f909fd, fb8e8d58f116d069e5939e1f786ac84e7fa4533e, 9b5a04ac3ad9898c4745cba46ea26de74ba56a8e |
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