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CVE-2026-74733— gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock

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，已修复以下漏洞： gpio: pca953x：修复 pca953x_irq_bus_sync_unlock 中的 regmap 锁问题 在该驱动程序的 regmap 配置中已禁用锁机制，因为该驱动程序使用自己的锁。这意味着对所有 regmap 函数（读取或写入）的调用都必须持有 i2c_lock。然而，函数 pca953x_irq_bus_sync_unlock() 未持有该锁，因此可能导致多个线程引发寄存器读取/写入错误。 此前曾有一个补丁部分修复了此问题，但仅保护了对中断屏蔽寄存器的写入

AI Predicted 5.5 Difficulty: Hard EPSS 0.20% · P10

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux bfc6444b57dc7186b6acc964705d7516cbaf3904< e6a2f5f845f50b0c4299bace5111f56d3390a090 affected
bfc6444b57dc7186b6acc964705d7516cbaf3904< 9dc325327babe7f159e84cbe9380a45342da0585 affected
58a5c93bd1a6e949267400080f07e57ffe05ec34 affected
e2ecdddca80dd845df42376e4b0197fe97018ba2 affected
de7cffa53149c7b48bd1bb29b02390c9f05b7f41 affected
6.1.101< 6.2 affected
6.6.42< 6.7 affected
6.9.11< 6.10 affected
… +4 more rows
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I. Basic Information for CVE-2026-74733

Vulnerability Information
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Vulnerability Title
gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock Locking is disabled in the regmap config as this driver uses its own lock. This means that all calls to regmap functions (read or write) must hold the i2c_lock. The function pca953x_irq_bus_sync_unlock() did not do this, and it was therefore possible that multiple threads could cause an incorrect register to be read/written. A previous patch partly fixed this, but only protected the write to the interrupt mask register, and not the read from the direction register.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux bfc6444b57dc7186b6acc964705d7516cbaf3904 ~ e6a2f5f845f50b0c4299bace5111f56d3390a090 -
Linux Linux 6.10 -

II. Public POCs for CVE-2026-74733

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III. Intelligence Information for CVE-2026-74733

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Patches & Fixes for CVE-2026-74733 (2)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74638 drm/v3d: Serialize the scheduler timeout handlers
CVE-2026-74621 net/sched: act_ct: fix sk_buff leak when the header checks reject a packet
CVE-2026-74622 net: atlantic: free RX pages of consumed but not refilled buffers
CVE-2026-74623 net: atlantic: free stranded TX buffers on ring deinit
CVE-2026-74624 netfilter: nf_conntrack: defer invalid log until after unlock
CVE-2026-74625 netfilter: bridge: release template ct on non-IP path
CVE-2026-74627 net: devmem: prevent net-iov / page mixing
CVE-2026-74626 NTB: ntb_netdev: Preserve RX queue depth on allocation failure
CVE-2026-74628 net/x25: fix use-after-free of the socket by its timers
CVE-2026-74629 net/dibs: Correct freeing of dmb_clientid_arr
CVE-2026-74631 net: smc: fix splice entry lifetime imbalance in smc_rx_splice
CVE-2026-74630 ipv6: prevent in6_dev_get() from resurrecting inet6_dev
CVE-2026-74632 mm/huge_memory: fix huge_zero_pfn race
CVE-2026-74633 tracing: Fix NULL pointer dereference in module event cache removal
CVE-2026-74634 ring-buffer: Prevent subbuf order change when resizing is disabled
CVE-2026-74635 fbdev: bitblit: bound-check glyph index in bit_cursor()
CVE-2026-74636 tracing: Fix race between update_event_fields and, event_define_fields
CVE-2026-74637 perf/core: Fix group leader use-after-free after sibling detach
CVE-2026-74639 ALSA: us144mkii: re-anchor capture URBs on resubmission
CVE-2026-74650 staging: rtl8723bs: fix OOB read in WMM_param_handler()

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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