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CVE-2026-90126

rtc: pcf8563: fix clock provider leak on unbind

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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).

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From a39a6405d5f949bc651694028a55d74c514ef1f9 · fixed in 2b5622cf4ee218b6f98d31dbf3fbd44b9b6bd675; From a39a6405d5f949bc651694028a55d74c514ef1f9 · fixed in 36cb00c33bd83e7ce31b5a9f1f7c70db0cb7776c; From a39a6405d5f949bc651694028a55d74c514ef1f9 · fixed in 30b7c63af50fe1464e7582a37de1ca4bd030ecc1; From a39a6405d5f949bc651694028a55d74c514ef1f9 · fixed in 7afb8db47c4f107bce89cfe5115fb31ba7c94665; From a39a6405d5f949bc651694028a55d74c514ef1f9 · fixed in 97edf3fd9a46ea89a167966991c0449cfa07b36f; From a39a6405d5f949bc651694028a55d74c514ef1f9 · fixed in 08a59c28c2bdbcd655e99526c86a41dc83834283; From a39a6405d5f949bc651694028a55d74c514ef1f9 · fixed in 6218c0533a72235ec9c5f41b812c63d963bd4a3e; From a39a6405d5f949bc651694028a55d74c514ef1f9 · fixed in 9c48a53685040bb0de45a640b34055cbbfc69d4f

  • Linux Linux

    4.4

  • KernelLinux

    From 4.4.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 8

git.kernel.org