f2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-38627
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-08-22 16:15:36 UTC
Updated2026-06-01 17:16:35 UTC
DescriptionIn 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/[email protected]

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

EPSS: 0.000320000 probability, percentile 0.096310000 (date 2026-06-04)

Problem Types: CWE-416

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bff139b49d9f70c1ac5384aac94554846aa834de 74cbeeca4f16823ba58c882e1d8b836c0e39c93d git Not specified
CNA Linux Linux affected bff139b49d9f70c1ac5384aac94554846aa834de 5d604d40cd3232b09cb339941ef958e49283ed0a git Not specified
CNA Linux Linux affected bff139b49d9f70c1ac5384aac94554846aa834de cc81768212cdc509e5a986274db7bc24d18cde19 git Not specified
CNA Linux Linux affected bff139b49d9f70c1ac5384aac94554846aa834de 8fae5b6addd5f6895e03797b56e3c7b9f9cd15c9 git Not specified
CNA Linux Linux affected bff139b49d9f70c1ac5384aac94554846aa834de 39868685c2a94a70762bc6d77dc81d781d05bff5 git Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.118 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.1 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5d604d40cd3232b09cb339941ef958e49283ed0a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc81768212cdc509e5a986274db7bc24d18cde19 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/74cbeeca4f16823ba58c882e1d8b836c0e39c93d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8fae5b6addd5f6895e03797b56e3c7b9f9cd15c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/39868685c2a94a70762bc6d77dc81d781d05bff5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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