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CVE-2025-38627— f2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于f2fs_free_dic未正确处理异步释放，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux bff139b49d9f70c1ac5384aac94554846aa834de< 74cbeeca4f16823ba58c882e1d8b836c0e39c93d affected
bff139b49d9f70c1ac5384aac94554846aa834de< 5d604d40cd3232b09cb339941ef958e49283ed0a affected
bff139b49d9f70c1ac5384aac94554846aa834de< cc81768212cdc509e5a986274db7bc24d18cde19 affected
bff139b49d9f70c1ac5384aac94554846aa834de< 8fae5b6addd5f6895e03797b56e3c7b9f9cd15c9 affected
bff139b49d9f70c1ac5384aac94554846aa834de< 39868685c2a94a70762bc6d77dc81d781d05bff5 affected
6.0 affected
< 6.0 unaffected
6.1.175≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-38627

Vulnerability Information
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Vulnerability Title
f2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于f2fs_free_dic未正确处理异步释放，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux bff139b49d9f70c1ac5384aac94554846aa834de ~ 74cbeeca4f16823ba58c882e1d8b836c0e39c93d -
Linux Linux 6.0 -

II. Public POCs for CVE-2025-38627

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III. Intelligence Information for CVE-2025-38627

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Patches & Fixes for CVE-2025-38627 (2)

Same Patch Batch · Linux · 2025-08-22 · 60 CVEs total

CVE-2025-38660 9.8 CRITICAL [ceph] parse_longname(): strrchr() expects NUL-terminated string
CVE-2025-38658 8.8 HIGH nvmet: pci-epf: Do not complete commands twice if nvmet_req_init() fails
CVE-2025-38643 8.8 HIGH wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac()
CVE-2024-58239 8.2 HIGH tls: stop recv() if initial process_rx_list gave us non-DATA
CVE-2025-38675 7.8 HIGH xfrm: state: initialize state_ptrs earlier in xfrm_state_find
CVE-2025-38659 7.8 HIGH gfs2: No more self recovery
CVE-2025-38656 7.8 HIGH wifi: iwlwifi: Fix error code in iwl_op_mode_dvm_start()
CVE-2025-38653 7.8 HIGH proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al
CVE-2025-38667 7.8 HIGH iio: fix potential out-of-bound write
CVE-2025-38619 7.8 HIGH media: ti: j721e-csi2rx: fix list_del corruption
CVE-2025-38640 7.8 HIGH bpf: Disable migration in nf_hook_run_bpf().
CVE-2025-38670 7.8 HIGH arm64/entry: Mask DAIF in cpu_switch_to(), call_on_irq_stack()
CVE-2025-38618 7.8 HIGH vsock: Do not allow binding to VMADDR_PORT_ANY
CVE-2025-38617 7.8 HIGH net/packet: fix a race in packet_set_ring() and packet_notifier()
CVE-2025-38616 7.8 HIGH tls: handle data disappearing from under the TLS ULP
CVE-2025-38657 7.3 HIGH wifi: rtw89: mcc: prevent shift wrapping in rtw89_core_mlsr_switch()
CVE-2025-38652 7.3 HIGH f2fs: fix to avoid out-of-boundary access in devs.path
CVE-2025-38639 7.1 HIGH netfilter: xt_nfacct: don't assume acct name is null-terminated
CVE-2025-38661 7.1 HIGH platform/x86: alienware-wmi-wmax: Fix `dmi_system_id` array
CVE-2025-38662 7.1 HIGH ASoC: mediatek: mt8365-dai-i2s: pass correct size to mt8365_dai_set_priv

Showing top 20 of 60 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38627

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