CVE-2025-38627

HighCVSS 7.8/10Last modified Jul 30, 2026

Description

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

f2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic

The decompress_io_ctx may be released asynchronously after I/O completion. If this file is deleted immediately after read, and the kworker of processing post_read_wq has not been executed yet due to high workloads, It is possible that the inode(f2fs_inode_info) is evicted and freed before it is used f2fs_free_dic.

The UAF case as below: Thread A Thread B - f2fs_decompress_end_io - f2fs_put_dic - queue_work add free_dic work to post_read_wq - do_unlink - iput - evict - call_rcu This file is deleted after read.

Thread C kworker to process post_read_wq - rcu_do_batch - f2fs_free_inode - kmem_cache_free inode is freed by rcu - process_scheduled_works - f2fs_late_free_dic - f2fs_free_dic - f2fs_release_decomp_mem read (dic->inode)->i_compress_algorithm

This patch store compress_algorithm and sbi in dic to avoid inode UAF.

In addition, the previous solution is deprecated in [1] may cause system hang. [1] https://lore.kernel.org/all/c36ab955-c8db-4a8b-a9d0-f07b5f426c3f@kernel.org

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

VendorProductVersions
LinuxLinux>= bff139b49d9f70c1ac5384aac94554846aa834de, < 74cbeeca4f16823ba58c882e1d8b836c0e39c93d; >= bff139b49d9f70c1ac5384aac94554846aa834de, < 5d604d40cd3232b09cb339941ef958e49283ed0a; >= bff139b49d9f70c1ac5384aac94554846aa834de, < cc81768212cdc509e5a986274db7bc24d18cde19; >= bff139b49d9f70c1ac5384aac94554846aa834de, < 8fae5b6addd5f6895e03797b56e3c7b9f9cd15c9; >= bff139b49d9f70c1ac5384aac94554846aa834de, < 39868685c2a94a70762bc6d77dc81d781d05bff5
LinuxLinux6.0

References

Timeline

Published
Aug 22, 2025
Last modified
Jul 30, 2026
NVD status
Modified

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CVE-2025-38627: High severity, CVSS 7.8 | Vulnix