Bug 2338859 (CVE-2024-57915)

Summary:	CVE-2024-57915 kernel: usb: gadget: u_serial: Disable ep before setting port to null to fix the crash caused by port being null
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	unspecified	CC:	dfreiber, drow, jburrell, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	[REJECTED CVE] A vulnerability in the Linux kernel's USB gadget subsystem allowed a race condition where gserial_disconnect could clear gser->ioport during unbinding, leading to a null pointer dereference in gs_read_complete, potentially causing a kernel crash. An attacker could exploit this by repeatedly triggering gadget reconfiguration, leading to denial of service. This issue has been resolved by disabling the endpoint before setting the port to null, preventing access to freed resources.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-01-19 12:02:49 UTC

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

usb: gadget: u_serial: Disable ep before setting port to null to fix the crash caused by port being null

Considering that in some extreme cases, when performing the
unbinding operation, gserial_disconnect has cleared gser->ioport,
which triggers gadget reconfiguration, and then calls gs_read_complete,
resulting in access to a null pointer. Therefore, ep is disabled before
gserial_disconnect sets port to null to prevent this from happening.

Call trace:
 gs_read_complete+0x58/0x240
 usb_gadget_giveback_request+0x40/0x160
 dwc3_remove_requests+0x170/0x484
 dwc3_ep0_out_start+0xb0/0x1d4
 __dwc3_gadget_start+0x25c/0x720
 kretprobe_trampoline.cfi_jt+0x0/0x8
 kretprobe_trampoline.cfi_jt+0x0/0x8
 udc_bind_to_driver+0x1d8/0x300
 usb_gadget_probe_driver+0xa8/0x1dc
 gadget_dev_desc_UDC_store+0x13c/0x188
 configfs_write_iter+0x160/0x1f4
 vfs_write+0x2d0/0x40c
 ksys_write+0x7c/0xf0
 __arm64_sys_write+0x20/0x30
 invoke_syscall+0x60/0x150
 el0_svc_common+0x8c/0xf8
 do_el0_svc+0x28/0xa0
 el0_svc+0x24/0x84

Comment 1 Avinash Hanwate 2025-01-20 04:34:46 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025011940-CVE-2024-57915-fc93@gregkh/T

Comment 3 TEJ RATHI 2025-02-19 11:21:07 UTC

This CVE has been rejected upstream:
https://lore.kernel.org/linux-cve-announce/2025021308-REJECTED-3f47@gregkh/