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Review reviewHigh

CVE-2023-53804

Linux

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 chang...

CVSS
7.8
EPSS
0.12%
2.54% percentile
CISA KEV
Not listed
Published
2025.12.09
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.12%
Technical severityCVSS 7.8

Vulnerability overview

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 chang...

Affected product and versions

Product
Linux
Affected versions
>= e912a5b66837ee89fb025e67b5efeaa11930c2ce < f31e18131ee2ce80a4da5c808221d25b1ae9ad6d, >= e912a5b66837ee89fb025e67b5efeaa11930c2ce < 2a782ea8ebd712a458466e3103e2881b4f886cb5, >= e912a5b66837ee89fb025e67b5efeaa11930c2ce < 116d53f09ff52e6f98e3fe1f85d8898d6ba26c68, >= e912a5b66837ee89fb025e67b5efeaa11930c2ce < 6b4205ea97901f822004e6c8d59484ccfda03faa, >= e912a5b66837ee89fb025e67b5efeaa11930c2ce < b8427b8522d9ede53015ba45a9978ba68d1162f5, >= e912a5b66837ee89fb025e67b5efeaa11930c2ce < acc2a40e428f12780004e1e9fce4722d88f909fd, >= e912a5b66837ee89fb025e67b5efeaa11930c2ce < fb8e8d58f116d069e5939e1f786ac84e7fa4533e, >= e912a5b66837ee89fb025e67b5efeaa11930c2ce < 9b5a04ac3ad9898c4745cba46ea26de74ba56a8e, >= 2.6.37
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available