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CVE-2025-38217— hwmon: (ftsteutates) Fix TOCTOU race in fts_read()

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TOCTOU竞争条件导致未定义行为。

AI Predicted 5.5 Difficulty: Hard EPSS 0.12% · P2

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 1c5759d8ce054961b454af69568a41e7e3210ee1< d95d87841d2a575bed3691884e8fedef57d7710d affected
1c5759d8ce054961b454af69568a41e7e3210ee1< 83e2ba8971ccd8fc08319fc7593288f070d80a76 affected
1c5759d8ce054961b454af69568a41e7e3210ee1< 4d646f627d3b7ed1cacca66e598af8bcd632d465 affected
1c5759d8ce054961b454af69568a41e7e3210ee1< 14c9ede9ca4cd078ad76a6ab9617b81074eb58bf affected
6.3 affected
< 6.3 unaffected
6.6.95≤ 6.6.* unaffected
6.12.35≤ 6.12.* unaffected
… +2 more rows
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I. Basic Information for CVE-2025-38217

Vulnerability Information
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Vulnerability Title
hwmon: (ftsteutates) Fix TOCTOU race in fts_read()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (ftsteutates) Fix TOCTOU race in fts_read() In the fts_read() function, when handling hwmon_pwm_auto_channels_temp, the code accesses the shared variable data->fan_source[channel] twice without holding any locks. It is first checked against FTS_FAN_SOURCE_INVALID, and if the check passes, it is read again when used as an argument to the BIT() macro. This creates a Time-of-Check to Time-of-Use (TOCTOU) race condition. Another thread executing fts_update_device() can modify the value of data->fan_source[channel] between the check and its use. If the value is changed to FTS_FAN_SOURCE_INVALID (0xff) during this window, the BIT() macro will be called with a large shift value (BIT(255)). A bit shift by a value greater than or equal to the type width is undefined behavior and can lead to a crash or incorrect values being returned to userspace. Fix this by reading data->fan_source[channel] into a local variable once, eliminating the race condition. Additionally, add a bounds check to ensure the value is less than BITS_PER_LONG before passing it to the BIT() macro, making the code more robust against undefined behavior. This possible bug was found by an experimental static analysis tool developed by our team.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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TOCTOU竞争条件导致未定义行为。
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 1c5759d8ce054961b454af69568a41e7e3210ee1 ~ d95d87841d2a575bed3691884e8fedef57d7710d -
Linux Linux 6.3 -

II. Public POCs for CVE-2025-38217

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III. Intelligence Information for CVE-2025-38217

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Same Patch Batch · Linux · 2025-07-04 · 59 CVEs total

CVE-2025-38209 9.8 CRITICAL nvme-tcp: remove tag set when second admin queue config fails
CVE-2025-38211 9.8 CRITICAL RDMA/iwcm: Fix use-after-free of work objects after cm_id destruction
CVE-2025-38174 8.8 HIGH thunderbolt: Do not double dequeue a configuration request
CVE-2025-38216 8.8 HIGH iommu/vt-d: Restore context entry setup order for aliased devices
CVE-2025-38233 7.8 HIGH powerpc64/ftrace: fix clobbered r15 during livepatching
CVE-2025-38230 7.8 HIGH jfs: validate AG parameters in dbMount() to prevent crashes
CVE-2025-38227 7.8 HIGH media: vidtv: Terminating the subsequent process of initialization failure
CVE-2025-38226 7.8 HIGH media: vivid: Change the siize of the composing
CVE-2025-38224 7.8 HIGH can: kvaser_pciefd: refine error prone echo_skb_max handling logic
CVE-2025-38218 7.8 HIGH f2fs: fix to do sanity check on sit_bitmap_size
CVE-2025-38232 7.8 HIGH NFSD: fix race between nfsd registration and exports_proc
CVE-2025-38212 7.8 HIGH ipc: fix to protect IPCS lookups using RCU
CVE-2025-38175 7.8 HIGH binder: fix yet another UAF in binder_devices
CVE-2025-38234 7.8 HIGH sched/rt: Fix race in push_rt_task
CVE-2025-38206 7.8 HIGH exfat: fix double free in delayed_free
CVE-2025-38204 7.8 HIGH jfs: fix array-index-out-of-bounds read in add_missing_indices
CVE-2025-38192 7.8 HIGH net: clear the dst when changing skb protocol
CVE-2025-38187 7.8 HIGH drm/nouveau: fix a use-after-free in r535_gsp_rpc_push()
CVE-2025-38184 7.8 HIGH tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer
CVE-2025-38180 7.8 HIGH net: atm: fix /proc/net/atm/lec handling

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-2025-38217

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