What’s Vulnerable › Vulnerabilities

CVE-2026-63822: wifi: ath11k: fix warning when unbinding

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-08-17

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath11k: fix warning when unbinding If there is an error during some initialization related to firmware, the buffers dp->tx_ring[i].tx_status are released. However this is released again when the device is unbinded (ath11k_pci), and we get: WARNING: CPU: 0 PID: 6231 at mm/slub.c:4368 free_large_kmalloc+0x57/0x90 Call Trace: free_large_kmalloc ath11k_dp_free ath11k_core_deinit ath11k_pci_remove ... The issue is always reproducible from a VM because the MSI addressing initialization is failing. In order to fix the issue, just set the buffers to NULL after releasing in order to avoid the double free.

Affected products

• Linux kernel: 5.6 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/051f954b94479d72222c9fbc82a3eef4777bca01
• https://git.kernel.org/stable/c/0a946abb82f29abe9a15173b707a449cb039b43e
• https://git.kernel.org/stable/c/0aa097a370277deab5337030b9e2d395742f469c
• https://git.kernel.org/stable/c/318703b6f71d1a29ee0ac46c32a38f7734d4cfb2
• https://git.kernel.org/stable/c/40aa3c2b0cb8e34e0576fc94cc70e4e33db03c0a
• https://git.kernel.org/stable/c/7b2e62b9080bf4a5f4e70cfe47156df8d93a4f13
• https://git.kernel.org/stable/c/8b7a26b6681922a38cd5a7829ace61f8e54df9b7
• https://git.kernel.org/stable/c/e569a5cb401a267168621aa9a1e7f07fcc9612c3

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