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CVE-2026-90126— rtc: pcf8563: fix clock provider leak on unbind

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： rtc: pcf8563：修复解除绑定时的时钟提供者泄漏问题 函数通过 注册了 CLKOUT 时钟提供者，但此后从未对其进行清理：代码中缺少 调用，且该驱动程序也没有实现移除（remove）回调函数。每次调用 都会分配一个 结构体，获取对设备树（OF）节点的引用，并在全局 列表中插入一个条目；而当设备解除绑定时，这些资源均未被释放。因此，每次绑定/解除绑定操作（或重新加载模块）都会导致一个提供者结构体和一个 of_node 引用的内存泄漏。 时钟对象本身已经通过设备管理资源

AI Predicted 4.4 Difficulty: Theoretical EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

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Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a39a6405d5f949bc651694028a55d74c514ef1f9< 2b5622cf4ee218b6f98d31dbf3fbd44b9b6bd675 affected
a39a6405d5f949bc651694028a55d74c514ef1f9< 36cb00c33bd83e7ce31b5a9f1f7c70db0cb7776c affected
a39a6405d5f949bc651694028a55d74c514ef1f9< 30b7c63af50fe1464e7582a37de1ca4bd030ecc1 affected
a39a6405d5f949bc651694028a55d74c514ef1f9< 7afb8db47c4f107bce89cfe5115fb31ba7c94665 affected
a39a6405d5f949bc651694028a55d74c514ef1f9< 97edf3fd9a46ea89a167966991c0449cfa07b36f affected
a39a6405d5f949bc651694028a55d74c514ef1f9< 08a59c28c2bdbcd655e99526c86a41dc83834283 affected
a39a6405d5f949bc651694028a55d74c514ef1f9< 6218c0533a72235ec9c5f41b812c63d963bd4a3e affected
a39a6405d5f949bc651694028a55d74c514ef1f9< 9c48a53685040bb0de45a640b34055cbbfc69d4f affected
… +10 more rows
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I. Basic Information for CVE-2026-90126

Vulnerability Information
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Vulnerability Title
rtc: pcf8563: fix clock provider leak on unbind
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rtc: pcf8563: fix clock provider leak on unbind pcf8563_clkout_register_clk() registers the CLKOUT clock provider with of_clk_add_provider(), but nothing ever unwinds it: there is no of_clk_del_provider() call and the driver has no remove callback. Each of_clk_add_provider() allocates a struct of_clk_provider, takes a reference on the OF node and adds an entry to the global of_clk_providers list, none of which is released when the device is unbound. Every bind/unbind (or module reload) therefore leaks a provider structure and an of_node reference. The clock itself is already device-managed (devm_clk_register()); only the provider registration was not. Use devm_of_clk_add_hw_provider() so the provider is removed automatically on unbind. Tie it to the parent i2c device, whose OF node carries the #clock-cells and clock-output-names properties (the RTC class device has no OF node of its own).
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 a39a6405d5f949bc651694028a55d74c514ef1f9 ~ 2b5622cf4ee218b6f98d31dbf3fbd44b9b6bd675 -
Linux Linux 4.4 -

II. Public POCs for CVE-2026-90126

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III. Intelligence Information for CVE-2026-90126

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Patches & Fixes for CVE-2026-90126 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90126

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