CVE-2026-53112

Summary

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

wifi: rtlwifi: pci: fix possible use-after-free caused by unfinished irq_prepare_bcn_tasklet

The irq_prepare_bcn_tasklet is initialized in rtl_pci_init() and scheduled when RTL_IMR_BCNINT interrupt is triggered by hardware. But it is never killed in rtl_pci_deinit(). When the rtlwifi card probe fails or is being detached, the ieee80211_hw is deallocated. However, irq_prepare_bcn_tasklet may still be running or pending, leading to use-after-free when the freed ieee80211_hw is accessed in _rtl_pci_prepare_bcn_tasklet().

Similar to irq_tasklet, add tasklet_kill() in rtl_pci_deinit() to ensure that irq_prepare_bcn_tasklet is properly terminated before the ieee80211_hw is released.

The issue was identified through static analysis.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/ae10d4a1ab6bcaa1336abb171908a9a365761d3e
• https://git.kernel.org/stable/c/fac1079e0fdec6df6d7562c21941587236dc3def
• https://git.kernel.org/stable/c/e40873820c9d245ce482faa7ad514ebdb3b8d23d
• https://git.kernel.org/stable/c/008c456b76e9070979bc0e763897a5d3b0fdd4dc
• https://git.kernel.org/stable/c/7731b67bd59d1284d150cbe40a47e95a10613234
• https://git.kernel.org/stable/c/aa10a452e34810987fb9f4a047995b30003fb53f
• https://git.kernel.org/stable/c/3c0e8a3179e6325a7dc6ce221aef0e03d854ab4b
• https://git.kernel.org/stable/c/039cd522dc70151da13329a5e3ae19b1736f468a

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