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CVE-2026-74547— hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread

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基金会开源的一个操作系统内核。 Linux kernel 2.6.29版本存在安全漏洞，该漏洞源于adt7470驱动对auto_update_interval参数值的下限设置不当，导致用户空间将该参数配置为0时，更新线程陷入无界忙循环，持续占用CPU并向I2C总线发送大量事务，可能导致拒绝服务。

AI Predicted 6.5 Difficulty: Easy EPSS 0.18% · P7

Possible ATT&CK Techniques 2 AI

T1562 T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 89fac11cb3e7c5860c425dba14845c09ccede39d< 2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344 affected
89fac11cb3e7c5860c425dba14845c09ccede39d< 4dc1518f9cc57c6db99514cafeb02dd7117d5bda affected
89fac11cb3e7c5860c425dba14845c09ccede39d< 1325975a2eab265510e6036d8bf0c0068373d332 affected
89fac11cb3e7c5860c425dba14845c09ccede39d< 1a42bd72a66205e439db1d1142442b62d393408a affected
89fac11cb3e7c5860c425dba14845c09ccede39d< 38e6b5ce5794ff09442231cc171c2be5e900bab3 affected
89fac11cb3e7c5860c425dba14845c09ccede39d< 82d65f7ef11edcea0228745440b8b4b1f222c34c affected
89fac11cb3e7c5860c425dba14845c09ccede39d< 5ea299c3aa42a827f6a863eeead6de3525bbb17a affected
89fac11cb3e7c5860c425dba14845c09ccede39d< cb0b7f9c43b0abbd422a7e4c2c85e91db429207c affected
… +10 more rows
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I. Basic Information for CVE-2026-74547

Vulnerability Information
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Vulnerability Title
hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread When userspace configures 'auto_update_interval' to 0 via sysfs, the background kthread executes schedule_timeout_interruptible(0), which returns immediately. If 'num_temp_sensors' is concurrently or previously set to 0, the msleep_interruptible() delay inside adt7470_read_temperatures() also becomes 0. This combination forces the background thread into a tight, unbounded busy-loop, hogging the CPU and flooding the I2C bus with a continuous stream of transactions. Fix this vulnerability by raising the lower limit of the clamp_val in auto_update_interval_store() from 0 to 500 milliseconds. This guarantees a reasonable minimum sleep window between sensor updates, protecting the system from intentional or accidental I2C bus denial of service.
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基金会开源的一个操作系统内核。 Linux kernel 2.6.29版本存在安全漏洞，该漏洞源于adt7470驱动对auto_update_interval参数值的下限设置不当，导致用户空间将该参数配置为0时，更新线程陷入无界忙循环，持续占用CPU并向I2C总线发送大量事务，可能导致拒绝服务。
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 89fac11cb3e7c5860c425dba14845c09ccede39d ~ 2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344 -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2026-74547

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III. Intelligence Information for CVE-2026-74547

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Patches & Fixes for CVE-2026-74547 (7)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72319 9.8 CRITICAL ipvs: ensure inner headers in ICMP errors are in headroom
CVE-2026-72220 9.8 CRITICAL sunrpc: harden rq_procinfo lifecycle to prevent double-free
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-74268 9.8 CRITICAL tcp: clear sock_ops cb flags before force-closing a child socket
CVE-2026-72207 9.8 CRITICAL ntfs: not change 0-byte $DATA attribute to non-resident
CVE-2026-74267 9.8 CRITICAL net/sched: sch_codel: Do not call qdisc_tree_reduce_backlog during peek before restoring q

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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