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.

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References

Other References

https://git.kernel.org/stable/c/116d53f09ff52e6f98e3fe1f85d8898d6ba26c68 https://git.kernel.org/stable/c/2a782ea8ebd712a458466e3103e2881b4f886cb5 https://git.kernel.org/stable/c/6b4205ea97901f822004e6c8d59484ccfda03faa https://git.kernel.org/stable/c/9b5a04ac3ad9898c4745cba46ea26de74ba56a8e https://git.kernel.org/stable/c/acc2a40e428f12780004e1e9fce4722d88f909fd https://git.kernel.org/stable/c/b8427b8522d9ede53015ba45a9978ba68d1162f5 https://git.kernel.org/stable/c/f31e18131ee2ce80a4da5c808221d25b1ae9ad6d https://git.kernel.org/stable/c/fb8e8d58f116d069e5939e1f786ac84e7fa4533e

Frequently Asked Questions

What is CVE-2023-53804? +

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 do I check if I'm vulnerable to CVE-2023-53804? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2023-53804

Description

References

Other References

Frequently Asked Questions

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