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		"aggregate_severity":{
			"namespace":"https://nvd.nist.gov/vuln-metrics/cvss",
			"text":"LOW"
		},
		"category":"csaf_vex",
		"csaf_version":"2.0",
		"distribution":{
			"tlp":{
				"label":"WHITE",
				"url":"https:/www.first.org/tlp/"
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		"lang":"en",
		"notes":[
			{
				"text":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: core: Fix hang in usb_kill_urb by adding memory barriers\n\nThe syzbot fuzzer has identified a bug in which processes hang waiting\nfor usb_kill_urb() to return.  It turns out the issue is not unlinking\nthe URB; that works just fine.  Rather, the problem arises when the\nwakeup notification that the URB has completed is not received.\n\nThe reason is memory-access ordering on SMP systems.  In outline form,\nusb_kill_urb() and __usb_hcd_giveback_urb() operating concurrently on\ndifferent CPUs perform the following actions:\n\nCPU 0\t\t\t\t\tCPU 1\n----------------------------\t\t---------------------------------\nusb_kill_urb():\t\t\t\t__usb_hcd_giveback_urb():\n  ...\t\t\t\t\t  ...\n  atomic_inc(&urb->reject);\t\t  atomic_dec(&urb->use_count);\n  ...\t\t\t\t\t  ...\n  wait_event(usb_kill_urb_queue,\n\tatomic_read(&urb->use_count) == 0);\n\t\t\t\t\t  if (atomic_read(&urb->reject))\n\t\t\t\t\t\twake_up(&usb_kill_urb_queue);\n\nConfining your attention to urb->reject and urb->use_count, you can\nsee that the overall pattern of accesses on CPU 0 is:\n\n\twrite urb->reject, then read urb->use_count;\n\nwhereas the overall pattern of accesses on CPU 1 is:\n\n\twrite urb->use_count, then read urb->reject.\n\nThis pattern is referred to in memory-model circles as SB (for \"Store\nBuffering\"), and it is well known that without suitable enforcement of\nthe desired order of accesses -- in the form of memory barriers -- it\nis entirely possible for one or both CPUs to execute their reads ahead\nof their writes.  The end result will be that sometimes CPU 0 sees the\nold un-decremented value of urb->use_count while CPU 1 sees the old\nun-incremented value of urb->reject.  Consequently CPU 0 ends up on\nthe wait queue and never gets woken up, leading to the observed hang\nin usb_kill_urb().\n\nThe same pattern of accesses occurs in usb_poison_urb() and the\nfailure pathway of usb_hcd_submit_urb().\n\nThe problem is fixed by adding suitable memory barriers.  To provide\nproper memory-access ordering in the SB pattern, a full barrier is\nrequired on both CPUs.  The atomic_inc() and atomic_dec() accesses\nthemselves don't provide any memory ordering, but since they are\npresent, we can use the optimized smp_mb__after_atomic() memory\nbarrier in the various routines to obtain the desired effect.\n\nThis patch adds the necessary memory barriers.",
				"category":"general",
				"title":"Synopsis"
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				"summary":"nvd cve",
				"category":"external",
				"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-48760"
			},
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				"summary":"CVE-2022-48760 vex file",
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				"url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2022-48760&packageName=kernel"
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		"title":"openEuler cve CVE-2022-48760",
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			"notes":[
				{
					"text":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: core: Fix hang in usb_kill_urb by adding memory barriers\n\nThe syzbot fuzzer has identified a bug in which processes hang waiting\nfor usb_kill_urb() to return.  It turns out the issue is not unlinking\nthe URB; that works just fine.  Rather, the problem arises when the\nwakeup notification that the URB has completed is not received.\n\nThe reason is memory-access ordering on SMP systems.  In outline form,\nusb_kill_urb() and __usb_hcd_giveback_urb() operating concurrently on\ndifferent CPUs perform the following actions:\n\nCPU 0\t\t\t\t\tCPU 1\n----------------------------\t\t---------------------------------\nusb_kill_urb():\t\t\t\t__usb_hcd_giveback_urb():\n  ...\t\t\t\t\t  ...\n  atomic_inc(&urb->reject);\t\t  atomic_dec(&urb->use_count);\n  ...\t\t\t\t\t  ...\n  wait_event(usb_kill_urb_queue,\n\tatomic_read(&urb->use_count) == 0);\n\t\t\t\t\t  if (atomic_read(&urb->reject))\n\t\t\t\t\t\twake_up(&usb_kill_urb_queue);\n\nConfining your attention to urb->reject and urb->use_count, you can\nsee that the overall pattern of accesses on CPU 0 is:\n\n\twrite urb->reject, then read urb->use_count;\n\nwhereas the overall pattern of accesses on CPU 1 is:\n\n\twrite urb->use_count, then read urb->reject.\n\nThis pattern is referred to in memory-model circles as SB (for \"Store\nBuffering\"), and it is well known that without suitable enforcement of\nthe desired order of accesses -- in the form of memory barriers -- it\nis entirely possible for one or both CPUs to execute their reads ahead\nof their writes.  The end result will be that sometimes CPU 0 sees the\nold un-decremented value of urb->use_count while CPU 1 sees the old\nun-incremented value of urb->reject.  Consequently CPU 0 ends up on\nthe wait queue and never gets woken up, leading to the observed hang\nin usb_kill_urb().\n\nThe same pattern of accesses occurs in usb_poison_urb() and the\nfailure pathway of usb_hcd_submit_urb().\n\nThe problem is fixed by adding suitable memory barriers.  To provide\nproper memory-access ordering in the SB pattern, a full barrier is\nrequired on both CPUs.  The atomic_inc() and atomic_dec() accesses\nthemselves don't provide any memory ordering, but since they are\npresent, we can use the optimized smp_mb__after_atomic() memory\nbarrier in the various routines to obtain the desired effect.\n\nThis patch adds the necessary memory barriers.",
					"category":"description",
					"title":"Vulnerability Description"
				}
			],
			"product_status":{
				"fixed":[
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				]
			},
			"remediations":[
				{
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						"openEuler-20.03-LTS-SP4:python2-perf-debuginfo-4.19.90-2407.4.0.0286.oe2003sp4.x86_64",
						"openEuler-20.03-LTS-SP4:python3-perf-4.19.90-2407.4.0.0286.oe2003sp4.x86_64",
						"openEuler-20.03-LTS-SP4:python3-perf-debuginfo-4.19.90-2407.4.0.0286.oe2003sp4.x86_64",
						"openEuler-20.03-LTS-SP4:kernel-4.19.90-2407.4.0.0286.oe2003sp4.src"
					],
					"details":"kernel security update",
					"category":"vendor_fix",
					"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1862"
				}
			],
			"scores":[
				{
					"cvss_v3":{
						"baseSeverity":"MEDIUM",
						"baseScore":5.5,
						"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
						"version":"3.1"
					},
					"products":[
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						"openEuler-20.03-LTS-SP4:python2-perf-4.19.90-2407.4.0.0286.oe2003sp4.x86_64",
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						"openEuler-20.03-LTS-SP4:python3-perf-4.19.90-2407.4.0.0286.oe2003sp4.x86_64",
						"openEuler-20.03-LTS-SP4:python3-perf-debuginfo-4.19.90-2407.4.0.0286.oe2003sp4.x86_64",
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					]
				}
			],
			"threats":[
				{
					"details":"Medium",
					"category":"impact"
				}
			],
			"title":"CVE-2022-48760"
		}
	]
}