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CVE-2025-38579— f2fs: fix KMSAN uninit-value in extent_info usage

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extent_info使用中存在未初始化值，可能导致未定义行为。

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 94afd6d6e5253179c9b891d02081cc8355a11768< 08e8ab00a6d20d5544c932ee85a297d833895141 affected
94afd6d6e5253179c9b891d02081cc8355a11768< e68b751ec2b15d866967812c57cfdfc1eba6a269 affected
94afd6d6e5253179c9b891d02081cc8355a11768< dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898 affected
94afd6d6e5253179c9b891d02081cc8355a11768< 44a79437309e0ee2276ac17aaedc71253af253a8 affected
94afd6d6e5253179c9b891d02081cc8355a11768< cc1615d5aba4f396cf412579928539a2b124c8a0 affected
94afd6d6e5253179c9b891d02081cc8355a11768< 01b6f5955e0008af6bc3a181310d2744bb349800 affected
94afd6d6e5253179c9b891d02081cc8355a11768< 154467f4ad033473e5c903a03e7b9bca7df9a0fa affected
5.15 affected
… +8 more rows
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I. Basic Information for CVE-2025-38579

Vulnerability Information
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Vulnerability Title
f2fs: fix KMSAN uninit-value in extent_info usage
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix KMSAN uninit-value in extent_info usage KMSAN reported a use of uninitialized value in `__is_extent_mergeable()` and `__is_back_mergeable()` via the read extent tree path. The root cause is that `get_read_extent_info()` only initializes three fields (`fofs`, `blk`, `len`) of `struct extent_info`, leaving the remaining fields uninitialized. This leads to undefined behavior when those fields are accessed later, especially during extent merging. Fix it by zero-initializing the `extent_info` struct before population.
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extent_info使用中存在未初始化值，可能导致未定义行为。
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 94afd6d6e5253179c9b891d02081cc8355a11768 ~ 08e8ab00a6d20d5544c932ee85a297d833895141 -
Linux Linux 5.15 -

II. Public POCs for CVE-2025-38579

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III. Intelligence Information for CVE-2025-38579

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Same Patch Batch · Linux · 2025-08-19 · 59 CVEs total

CVE-2025-38561 9.8 CRITICAL ksmbd: fix Preauh_HashValue race condition
CVE-2025-38566 9.8 CRITICAL sunrpc: fix handling of server side tls alerts
CVE-2025-38560 9.3 CRITICAL x86/sev: Evict cache lines during SNP memory validation
CVE-2025-38601 8.8 HIGH wifi: ath11k: clear initialized flag for deinit-ed srng lists
CVE-2025-38600 8.8 HIGH wifi: mt76: mt7925: fix off by one in mt7925_mcu_hw_scan()
CVE-2025-38599 8.8 HIGH wifi: mt76: mt7996: Fix possible OOB access in mt7996_tx()
CVE-2025-38592 8.8 HIGH Bluetooth: hci_devcd_dump: fix out-of-bounds via dev_coredumpv
CVE-2025-38608 8.6 HIGH bpf, ktls: Fix data corruption when using bpf_msg_pop_data() in ktls
CVE-2025-38574 8.6 HIGH pptp: ensure minimal skb length in pptp_xmit()
CVE-2025-38571 8.2 HIGH sunrpc: fix client side handling of tls alerts
CVE-2025-38595 7.8 HIGH xen: fix UAF in dmabuf_exp_from_pages()
CVE-2025-38598 7.8 HIGH drm/amdgpu: fix use-after-free in amdgpu_userq_suspend+0x51a/0x5a0
CVE-2025-38607 7.8 HIGH bpf: handle jset (if a & b ...) as a jump in CFG computation
CVE-2025-38614 7.8 HIGH eventpoll: Fix semi-unbounded recursion
CVE-2025-38615 7.8 HIGH fs/ntfs3: cancle set bad inode after removing name fails
CVE-2025-38604 7.8 HIGH wifi: rtl818x: Kill URBs before clearing tx status queue
CVE-2025-38593 7.8 HIGH Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'
CVE-2025-38586 7.8 HIGH bpf, arm64: Fix fp initialization for exception boundary
CVE-2025-38582 7.8 HIGH RDMA/hns: Fix double destruction of rsv_qp
CVE-2025-38580 7.8 HIGH ext4: fix inode use after free in ext4_end_io_rsv_work()

Showing top 20 of 59 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38579

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