CVE-2024-50249

/// Technical description

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

ACPI: CPPC: Make rmw_lock a raw_spin_lock

The following BUG was triggered:

=============================

[ BUG: Invalid wait context ]

6.12.0-rc2-XXX #406 Not tainted

-----------------------------

kworker/1:1/62 is trying to lock:

ffffff8801593030 (&cpc_ptr->rmw_lock){+.+.}-{3:3}, at: cpc_write+0xcc/0x370

other info that might help us debug this:

context-{5:5}

2 locks held by kworker/1:1/62:

#0: ffffff897ef5ec98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x50

#1: ffffff880154e238 (&sg_policy->update_lock){....}-{2:2}, at: sugov_update_shared+0x3c/0x280

stack backtrace:

CPU: 1 UID: 0 PID: 62 Comm: kworker/1:1 Not tainted 6.12.0-rc2-g9654bd3e8806 #406

Workqueue: 0x0 (events)

Call trace:

dump_backtrace+0xa4/0x130

show_stack+0x20/0x38

dump_stack_lvl+0x90/0xd0

dump_stack+0x18/0x28

__lock_acquire+0x480/0x1ad8

lock_acquire+0x114/0x310

_raw_spin_lock+0x50/0x70

cpc_write+0xcc/0x370

cpp

/// 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