Bug 2493740 (CVE-2026-53308)

Summary: CVE-2026-53308 kernel: power: supply: max77705: Free allocated workqueue and fix removal order
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's max77705 power supply driver. Incorrect management of workqueues and interrupt handlers during device removal can lead to a use-after-free vulnerability. This allows for the potential use of freed memory, which could result in system instability or, in certain scenarios, arbitrary code execution.
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Description OSIDB Bzimport 2026-06-26 21:04:25 UTC 
In the Linux kernel, the following vulnerability has been resolved:

power: supply: max77705: Free allocated workqueue and fix removal order

Use devm interface for allocating workqueue to fix two bugs at the same
time:

1. Driver leaks the memory on remove(), because the workqueue is not
   destroyed.

2. Driver allocates workqueue and then registers interrupt handlers
   with devm interface.  This means that probe error paths will not use a
   reversed order, but first destroy the workqueue and then, via devm
   release handlers, free the interrupt.

   The interrupt handler schedules work on this exact workqueue, thus if
   interrupt is hit in this short time window - after destroying
   workqueue, but before devm() frees the interrupt - the schedulled
   work will lead to use of freed memory.

Change is not equivalent in the workqueue itself: use non-legacy API
which does not set (__WQ_LEGACY | WQ_MEM_RECLAIM).  The workqueue is
used to update power supply (power_supply_changed()) status, thus there
is no point to run it for memory reclaim.  Note that dev_name() is not
directly used in second argument to prevent possible unlikely parsing
any "%" character in device name as format.
Comment 1 Mauro Matteo Cascella 2026-06-29 09:12:36 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062620-CVE-2026-53308-8564@gregkh/T