CVE-2025-38604 Information

Aug 20, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

wifi: rtl818x: Kill URBs before clearing tx status queue

In rtl8187_stop() move the call of usb_kill_anchored_urbs() before clearing b_tx_status.queue. This change prevents callbacks from using already freed skb due to anchor was not killed before freeing such skb.

BUG: kernel NULL pointer dereference address: 0000000000000080 PF: supervisor read access in kernel mode PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [1] SMP NOPTI CPU: 7 UID: 0 PID: 0 Comm: swapper/7 Not tainted 6.15.0 8 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX 1996) BIOS 0.0.0 02/06/2015 RIP: 0010:ieee80211_tx_status_irqsafe+0x21/0xc0 [mac80211] Call Trace: rtl8187_tx_cb+0x116/0x150 [rtl8187] __usb_hcd_giveback_urb+0x9d/0x120 usb_giveback_urb_bh+0xbb/0x140 process_one_work+0x19b/0x3c0 bh_worker+0x1a7/0x210 tasklet_action+0x10/0x30 handle_softirqs+0xf0/0x340 __irq_exit_rcu+0xcd/0xf0 common_interrupt+0x85/0xa0

Tested on RTL8187BvE device.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Reference

https://git.kernel.org/stable/c/14ca6952691fa8cc91e7644512e6ff24a595283f https://git.kernel.org/stable/c/16d8fd74dbfca0ea58645cd2fca13be10cae3cdd https://git.kernel.org/stable/c/7858a95566f4ebf59524666683d2dcdba3fca968 https://git.kernel.org/stable/c/81cfe34d0630de4e23ae804dcc08fb6f861dc37d https://git.kernel.org/stable/c/8c767727f331fb9455b0f81daad832b5925688cb https://git.kernel.org/stable/c/c51a45ad9070a6d296174fcbe5c466352836c12b

CNNVD-202508-2168 (Published: 2025-08-19)

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