Bug 2348216 (CVE-2022-49229)

Summary: CVE-2022-49229 kernel: ptp: unregister virtual clocks when unregistering physical clock.
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:21:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ptp: unregister virtual clocks when unregistering physical clock.

When unregistering a physical clock which has some virtual clocks,
unregister the virtual clocks with it.

This fixes the following oops, which can be triggered by unloading
a driver providing a PTP clock when it has enabled virtual clocks:

BUG: unable to handle page fault for address: ffffffffc04fc4d8
Oops: 0000 [#1] PREEMPT SMP NOPTI
RIP: 0010:ptp_vclock_read+0x31/0xb0
Call Trace:
 timecounter_read+0xf/0x50
 ptp_vclock_refresh+0x2c/0x50
 ? ptp_clock_release+0x40/0x40
 ptp_aux_kworker+0x17/0x30
 kthread_worker_fn+0x9b/0x240
 ? kthread_should_park+0x30/0x30
 kthread+0xe2/0x110
 ? kthread_complete_and_exit+0x20/0x20
 ret_from_fork+0x22/0x30
Comment 1 Avinash Hanwate 2025-02-26 12:11:40 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022622-CVE-2022-49229-2c2e@gregkh/T
Comment 4 Avinash Hanwate 2025-02-26 16:38:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022622-CVE-2022-49229-2c2e@gregkh/T