CVE-2024-39508

/// Technical description

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

io_uring/io-wq: Use set_bit() and test_bit() at worker->flags

Utilize set_bit() and test_bit() on worker->flags within io_uring/io-wq

to address potential data races.

The structure io_worker->flags may be accessed through various data

paths, leading to concurrency issues. When KCSAN is enabled, it reveals

data races occurring in io_worker_handle_work and

io_wq_activate_free_worker functions.

BUG: KCSAN: data-race in io_worker_handle_work / io_wq_activate_free_worker

write to 0xffff8885c4246404 of 4 bytes by task 49071 on cpu 28:

io_worker_handle_work (io_uring/io-wq.c:434 io_uring/io-wq.c:569)

io_wq_worker (io_uring/io-wq.c:?)

<snip>

read to 0xffff8885c4246404 of 4 bytes by task 49024 on cpu 5:

io_wq_activate_free_worker (io_uring/io-wq.c:? io_uring/io-wq.c:285)

io_wq_enqueue (io_uring/io-wq.c:947)

io_queue_iowq (io_uring/io_uring.c:524)

io_req_task_submit (io_uring/io_uring.c:1511)

io_handle_t

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References