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CVE-2026-98197— hwmon: (w83791d) remove fan/pwm 4-5 sysfs group on remove

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.

在 Linux 内核中，以下漏洞已被修复： hwmon: (w83791d) 在驱动卸载时移除 fan/pwm 4-5 sysfs 组 当 fan/pwm 4-5 引脚未用作 GPIO 时， 函数会在 I2C 客户端设备上创建 sysfs 组。 探测（probe）错误路径会在后续初始化步骤失败时移除该组，但在正常的移除（remove）路径中，仅移除了 。因此，可选的 fan/pwm 4-5 sysfs 文件可能在驱动解绑后仍然保留。 与这些文件相关的回调会访问驱动数据，而这些数据是通过 分配并在驱动解绑后释放的。若

CVSS 7.0 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6e1ecd9b8f1358ed4d099f0c54434240dc40debe< 081e3a78453635fb370b1712809d2af29e60b4c5 affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe< b1d419eb3bc41245c3d3d99dfe1a7b6c45989586 affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe< 2ccf6c512290a288a2d4d7f076430dfb0c6ee476 affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe< f6e2ab72f32d16d71a2549c7ea062dd209f71670 affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe< 2dd37d00f1f1af8e02ffa70ee573c10fd1a76864 affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe< 2c381e6e0f033f2df13bd64905e7232c42f49009 affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe< 583e04e88e75b8d57304015d83c38e82a9531600 affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe< 0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8 affected
… +10 more rows
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I. Basic Information for CVE-2026-98197

Vulnerability Information
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Vulnerability Title
hwmon: (w83791d) remove fan/pwm 4-5 sysfs group on remove
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83791d) remove fan/pwm 4-5 sysfs group on remove When the fan/pwm 4-5 pins are not used as GPIO, w83791d_probe() creates the w83791d_group_fanpwm45 sysfs group on the I2C client device. The probe error path removes this group when a later initialization step fails, but the normal remove path only removes w83791d_group. As a result, the optional fan/pwm 4-5 sysfs files can remain after the driver is unbound. The callbacks associated with these files access the driver data, which is devm allocated and released after driver unbind. Leaving the sysfs files behind can therefore result in accesses to stale driver data. Remove w83791d_group_fanpwm45 during normal teardown as well. This issue was found by manual code inspection.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 6e1ecd9b8f1358ed4d099f0c54434240dc40debe ~ 081e3a78453635fb370b1712809d2af29e60b4c5 -
Linux Linux 2.6.28 -

II. Public POCs for CVE-2026-98197

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III. Intelligence Information for CVE-2026-98197

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Patches & Fixes for CVE-2026-98197 (8)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98305 7.8 HIGH net: dsa: mxl862xx: disable the stats poll on teardown
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98311 7.8 HIGH wifi: virt_wifi: don't transfer operstate before register
CVE-2026-98276 7.8 HIGH net: lock the socket in sock_gettstamp()
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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