CVE-2026-63798

In the Linux kernel, the following vulnerability has been resolved:

irqchip/imgpdc: Fix resource leak, add missing chained handler cleanup on remove

The driver allocates domain generic chips using irq_alloc_domain_generic_chips() during probe and sets up chained handlers using irq_set_chained_handler_and_data(). However, on driver removal, the generic chips are not freed and the chained handlers are not removed.

The generic chips remain on the global gc_list and may later be accessed by generic interrupt chip suspend, resume, or shutdown callbacks after the driver has been removed, potentially resulting in a use-after-free and kernel crash.

The chained handlers that were installed in probe for peripheral and syswake interrupts are also left dangling, which can lead to spurious interrupts accessing freed memory.

Fix these issues by:

• Setting IRQ_DOMAIN_FLAG_DESTROY_GC flag in domain->flags, so the core code automatically removes generic chips when irq_domain_remove() is called

• Clearing all chained handlers with NULL in pdc_intc_remove()

Weakness

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

Affected Software

Potential Mitigations

• Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
• For example, glibc in Linux provides protection against free of invalid pointers.
• When using Xcode to target OS X or iOS, enable automatic reference counting (ARC) [REF-391].
• To help correctly and consistently manage memory when programming in C++, consider using a smart pointer class such as std::auto_ptr (defined by ISO/IEC ISO/IEC 14882:2003), std::shared_ptr and std::unique_ptr (specified by an upcoming revision of the C++ standard, informally referred to as C++ 1x), or equivalent solutions such as Boost.

References

• https://git.kernel.org/stable/c/0405a65e4ebd9eac13a765f9f02ac05851ca5421
• https://git.kernel.org/stable/c/37738fdf2ab1e504d1c63ce5bc0aeb6452d8f057
• https://git.kernel.org/stable/c/41826e5297e67cd96a0a46fde06a5069a8ce436a
• https://git.kernel.org/stable/c/44567537a2623dcd2b4018a7f043cf8069579e5d
• https://git.kernel.org/stable/c/8176773dfceae7978b01c20b233693e072053700
• https://git.kernel.org/stable/c/83d7ec14b0938ad8cae008058fd6f912f4a9a312
• https://git.kernel.org/stable/c/b3a3831b2eb884641906fc5e46207b205b6aea13
• https://git.kernel.org/stable/c/c2c7733101bb8c0b29ac9ee41073eaf602821a59