CVEvulnerability
CVE-2026-63822
- Status
- Undergoing Analysis
- Published
- 2026-07-19
- Last modified
- 2026-08-17
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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.
References
- https://git.kernel.org/stable/c/051f954b94479d72222c9fbc82a3eef4777bca01 git.kernel.org
- https://git.kernel.org/stable/c/0a946abb82f29abe9a15173b707a449cb039b43e git.kernel.org
- https://git.kernel.org/stable/c/0aa097a370277deab5337030b9e2d395742f469c git.kernel.org
- https://git.kernel.org/stable/c/318703b6f71d1a29ee0ac46c32a38f7734d4cfb2 git.kernel.org
- https://git.kernel.org/stable/c/40aa3c2b0cb8e34e0576fc94cc70e4e33db03c0a git.kernel.org
- https://git.kernel.org/stable/c/7b2e62b9080bf4a5f4e70cfe47156df8d93a4f13 git.kernel.org
- https://git.kernel.org/stable/c/8b7a26b6681922a38cd5a7829ace61f8e54df9b7 git.kernel.org
- https://git.kernel.org/stable/c/e569a5cb401a267168621aa9a1e7f07fcc9612c3 git.kernel.org