CVE-2025-38174

Summary

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

thunderbolt: Do not double dequeue a configuration request

Some of our devices crash in tb_cfg_request_dequeue():

general protection fault, probably for non-canonical address 0xdead000000000122

CPU: 6 PID: 91007 Comm: kworker/6:2 Tainted: G U W 6.6.65 RIP: 0010:tb_cfg_request_dequeue+0x2d/0xa0 Call Trace: <TASK> ? tb_cfg_request_dequeue+0x2d/0xa0 tb_cfg_request_work+0x33/0x80 worker_thread+0x386/0x8f0 kthread+0xed/0x110 ret_from_fork+0x38/0x50 ret_from_fork_asm+0x1b/0x30

The circumstances are unclear, however, the theory is that tb_cfg_request_work() can be scheduled twice for a request: first time via frame.callback from ring_work() and second time from tb_cfg_request(). Both times kworkers will execute tb_cfg_request_dequeue(), which results in double list_del() from the ctl->request_queue (the list poison deference hints at it: 0xdead000000000122).

Do not dequeue requests that don't have TB_CFG_REQUEST_ACTIVE bit set.

Affected Software

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

References

• https://git.kernel.org/stable/c/e49e994cd83705f7ca30eda1e304abddfd96a37a
• https://git.kernel.org/stable/c/0a3011d47dbc92a33621861c423cb64833d7fe57
• https://git.kernel.org/stable/c/2f62eda4d974c26bc595425eafd429067541f2c9
• https://git.kernel.org/stable/c/85286e634ebbaf9c0fb1cdf580add2f33fc7628c
• https://git.kernel.org/stable/c/5a057f261539720165d03d85024da2b52e67f63d
• https://git.kernel.org/stable/c/eb2d5e794fb966b3ef8bde99eb8561446a53509f
• https://git.kernel.org/stable/c/0771bcbe2f6e5d5f263cf466efe571d2754a46da
• https://git.kernel.org/stable/c/cdb4feab2f39e75a66239e3a112beced279612a8
• https://git.kernel.org/stable/c/0f73628e9da1ee39daf5f188190cdbaee5e0c98c

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