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CVE-2026-64084— hwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR

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基金会开源的一款操作系统内核。 Linux kernel 5.10版本、5.15版本及之前版本、6.1版本及之前版本、6.6版本及之前版本、6.12版本及之前版本、6.18版本及之前版本、7.0版本及之前版本和7.1版本及之前版本存在安全漏洞，该漏洞源于adm1266_gpio_get_multiple()函数中PDIO扫描边界错误，使用PMBus命令代码替代PDIO引脚数作为上限，导致越界读取和写入，可能造成信息泄露或系统崩溃。以下版本受到影响：5.10版本、5.

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux d98dfad35c38c037b37c4adc99df01da571031a5< d0593e15fdeb56048a72c5c6e720f702759d0ccd affected
d98dfad35c38c037b37c4adc99df01da571031a5< 17cee2f59029039416e8f6303050038eb59ba149 affected
d98dfad35c38c037b37c4adc99df01da571031a5< 299efd14c2eda7e5fd40025e54addd4151a01081 affected
d98dfad35c38c037b37c4adc99df01da571031a5< 4d1da9a6be5a8156c532d571c2ed237169f99244 affected
d98dfad35c38c037b37c4adc99df01da571031a5< b96c7f0bc0713dc6403912f6527d4ff9168d6fe6 affected
d98dfad35c38c037b37c4adc99df01da571031a5< fa7ca363069a70b0d1aa51e8892e3095fe2ac1ec affected
d98dfad35c38c037b37c4adc99df01da571031a5< 2aef8f08c479f4cbc83e1e6b19d1c94d4dd24f17 affected
d98dfad35c38c037b37c4adc99df01da571031a5< d7834d92251baade796812876e95555e2066fa9f affected
… +10 more rows
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I. Basic Information for CVE-2026-64084

Vulnerability Information
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Vulnerability Title
hwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR adm1266_gpio_get_multiple() iterates the PDIO portion of the caller-supplied mask using for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) { ... } where ADM1266_PDIO_STATUS is the PMBus command code (0xE9, i.e. 233), not the number of PDIO pins. The intended upper bound is ADM1266_GPIO_NR + ADM1266_PDIO_NR = 25. gpiolib hands in a mask sized for gc.ngpio (= 25 bits on this chip), so the iteration walks find_next_bit() up to 242, reading up to 217 extra bits (a handful of unsigned-long words: four on 64-bit, seven on 32-bit) of whatever lives past the end of the mask in the caller's stack. Any incidental set bit in that range then drives a set_bit(gpio_nr, bits) call that writes past the end of the caller-supplied bits array too -- both out-of-bounds. Substitute ADM1266_PDIO_NR for the constant so the scan stops at the last real PDIO bit.
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基金会开源的一款操作系统内核。 Linux kernel 5.10版本、5.15版本及之前版本、6.1版本及之前版本、6.6版本及之前版本、6.12版本及之前版本、6.18版本及之前版本、7.0版本及之前版本和7.1版本及之前版本存在安全漏洞，该漏洞源于adm1266_gpio_get_multiple()函数中PDIO扫描边界错误，使用PMBus命令代码替代PDIO引脚数作为上限，导致越界读取和写入，可能造成信息泄露或系统崩溃。以下版本受到影响：5.10版本、5.
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 d98dfad35c38c037b37c4adc99df01da571031a5 ~ d0593e15fdeb56048a72c5c6e720f702759d0ccd -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-64084

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III. Intelligence Information for CVE-2026-64084

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Patches & Fixes for CVE-2026-64084 (8)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64047 9.8 CRITICAL net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-64061 9.8 CRITICAL netfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-64046 9.8 CRITICAL net: tls: prevent chain-after-chain in plain text SG
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64066 9.8 CRITICAL netfs: Fix netfs_read_to_pagecache() to pause on subreq failure
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64122 9.8 CRITICAL net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64084

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