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		"aggregate_severity":{
			"namespace":"https://nvd.nist.gov/vuln-metrics/cvss",
			"text":"MEDIUM"
		},
		"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:arm64: compat: Do not treat syscall number as ESR_ELx for a bad syscallIf a compat process tries to execute an unknown system call above the__ARM_NR_COMPAT_END number, the kernel sends a SIGILL signal to theoffending process. Information about the error is printed to dmesg incompat_arm_syscall() -> arm64_notify_die() -> arm64_force_sig_fault() ->arm64_show_signal().arm64_show_signal() interprets a non-zero value forcurrent->thread.fault_code as an exception syndrome and displays themessage associated with the ESR_ELx.EC field (bits 31:26).current->thread.fault_code is set in compat_arm_syscall() ->arm64_notify_die() with the bad syscall number instead of a valid ESR_ELxvalue. This means that the ESR_ELx.EC field has the value that the user setfor the syscall number and the kernel can end up printing bogus exceptionmessages*. For example, for the syscall number 0x68000000, which evaluatesto ESR_ELx.EC value of 0x1A (ESR_ELx_EC_FPAC) the kernel prints this error:[   18.349161] syscall[300]: unhandled exception: ERET/ERETAA/ERETAB, ESR 0x68000000, Oops - bad compat syscall(2) in syscall[10000+50000][   18.350639] CPU: 2 PID: 300 Comm: syscall Not tainted 5.18.0-rc1 #79[   18.351249] Hardware name: Pine64 RockPro64 v2.0 (DT)[..]which is misleading, as the bad compat syscall has nothing to do withpointer authentication.Stop arm64_show_signal() from printing exception syndrome information byhaving compat_arm_syscall() set the ESR_ELx value to 0, as it has nomeaning for an invalid system call number. The example above now becomes:[   19.935275] syscall[301]: unhandled exception: Oops - bad compat syscall(2) in syscall[10000+50000][   19.936124] CPU: 1 PID: 301 Comm: syscall Not tainted 5.18.0-rc1-00005-g7e08006d4102 #80[   19.936894] Hardware name: Pine64 RockPro64 v2.0 (DT)[..]which although shows less information because the syscall number,wrongfully advertised as the ESR value, is missing, it is better thanshowing plainly wrong information. The syscall number can be easilyobtained with strace.*A 32-bit value above or equal to 0x8000_0000 is interpreted as a negativeinteger in compat_arm_syscal() and the condition scno < __ARM_NR_COMPAT_ENDevaluates to true; the syscall will exit to userspace in this case with theENOSYS error code instead of arm64_notify_die() being called.",
				"category":"general",
				"title":"Synopsis"
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			{
				"summary":"nvd cve",
				"category":"external",
				"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49520"
			},
			{
				"summary":"CVE-2022-49520 vex file",
				"category":"self",
				"url":"https://repo.openeuler.org/security/data/csaf/cve/2022/csaf-openeuler-cve-2022-49520.json"
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				"summary":"openEuler-SA-2025-2885",
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				"summary":"CVE-2022-49520",
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				"url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2022-49520&packageName=kernel"
			}
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		"title":"openEuler cve CVE-2022-49520",
		"tracking":{
			"initial_release_date":"2025-12-31T10:23:28+08:00",
			"revision_history":[
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					"date":"2025-12-31T10:23:28+08:00",
					"summary":"Initial",
					"number":"1.0.0"
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				"engine":{
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			"current_release_date":"2025-12-31T10:23:28+08:00",
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			"notes":[
				{
					"text":"In the Linux kernel, the following vulnerability has been resolved:arm64: compat: Do not treat syscall number as ESR_ELx for a bad syscallIf a compat process tries to execute an unknown system call above the__ARM_NR_COMPAT_END number, the kernel sends a SIGILL signal to theoffending process. Information about the error is printed to dmesg incompat_arm_syscall() -> arm64_notify_die() -> arm64_force_sig_fault() ->arm64_show_signal().arm64_show_signal() interprets a non-zero value forcurrent->thread.fault_code as an exception syndrome and displays themessage associated with the ESR_ELx.EC field (bits 31:26).current->thread.fault_code is set in compat_arm_syscall() ->arm64_notify_die() with the bad syscall number instead of a valid ESR_ELxvalue. This means that the ESR_ELx.EC field has the value that the user setfor the syscall number and the kernel can end up printing bogus exceptionmessages*. For example, for the syscall number 0x68000000, which evaluatesto ESR_ELx.EC value of 0x1A (ESR_ELx_EC_FPAC) the kernel prints this error:[   18.349161] syscall[300]: unhandled exception: ERET/ERETAA/ERETAB, ESR 0x68000000, Oops - bad compat syscall(2) in syscall[10000+50000][   18.350639] CPU: 2 PID: 300 Comm: syscall Not tainted 5.18.0-rc1 #79[   18.351249] Hardware name: Pine64 RockPro64 v2.0 (DT)[..]which is misleading, as the bad compat syscall has nothing to do withpointer authentication.Stop arm64_show_signal() from printing exception syndrome information byhaving compat_arm_syscall() set the ESR_ELx value to 0, as it has nomeaning for an invalid system call number. The example above now becomes:[   19.935275] syscall[301]: unhandled exception: Oops - bad compat syscall(2) in syscall[10000+50000][   19.936124] CPU: 1 PID: 301 Comm: syscall Not tainted 5.18.0-rc1-00005-g7e08006d4102 #80[   19.936894] Hardware name: Pine64 RockPro64 v2.0 (DT)[..]which although shows less information because the syscall number,wrongfully advertised as the ESR value, is missing, it is better thanshowing plainly wrong information. The syscall number can be easilyobtained with strace.*A 32-bit value above or equal to 0x8000_0000 is interpreted as a negativeinteger in compat_arm_syscal() and the condition scno < __ARM_NR_COMPAT_ENDevaluates to true; the syscall will exit to userspace in this case with theENOSYS error code instead of arm64_notify_die() being called.",
					"category":"description",
					"title":"Vulnerability Description"
				}
			],
			"product_status":{
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			"remediations":[
				{
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					],
					"details":"kernel security update",
					"category":"vendor_fix",
					"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2885"
				}
			],
			"scores":[
				{
					"cvss_v3":{
						"baseSeverity":"LOW",
						"baseScore":3.3,
						"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
						"version":"3.1"
					},
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					]
				}
			],
			"threats":[
				{
					"details":"Low",
					"category":"impact"
				}
			],
			"title":"CVE-2022-49520"
		}
	]
}