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	<DocumentTitle xml:lang="en">An update for kernel is now available for openEuler-22.03-LTS</DocumentTitle>
	<DocumentType>Security Advisory</DocumentType>
	<DocumentPublisher Type="Vendor">
		<ContactDetails>openeuler-security@openeuler.org</ContactDetails>
		<IssuingAuthority>openEuler security committee</IssuingAuthority>
	</DocumentPublisher>
	<DocumentTracking>
		<Identification>
			<ID>openEuler-SA-2023-1144</ID>
		</Identification>
		<Status>Final</Status>
		<Version>1.0</Version>
		<RevisionHistory>
			<Revision>
				<Number>1.0</Number>
				<Date>2023-03-04</Date>
				<Description>Initial</Description>
			</Revision>
		</RevisionHistory>
		<InitialReleaseDate>2023-03-04</InitialReleaseDate>
		<CurrentReleaseDate>2023-03-04</CurrentReleaseDate>
		<Generator>
			<Engine>openEuler SA Tool V1.0</Engine>
			<Date>2023-03-04</Date>
		</Generator>
	</DocumentTracking>
	<DocumentNotes>
		<Note Title="Synopsis" Type="General" Ordinal="1" xml:lang="en">kernel security update</Note>
		<Note Title="Summary" Type="General" Ordinal="2" xml:lang="en">An update for kernel is now available for openEuler-22.03-LTS.</Note>
		<Note Title="Description" Type="General" Ordinal="3" xml:lang="en">The Linux Kernel, the operating system core itself.

Security Fix(es):

There is a logic error in io_uring&apos;s implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation. In the io_prep_async_work function the assumption that the last io_grab_identity call cannot return false is not true, and in this case the function will use the init_cred or the previous linked requests identity to do operations instead of using the current identity. This can lead to reference counting issues causing use-after-free. We recommend upgrading past version 5.10.161.(CVE-2023-0240)

A memory leak flaw and potential divide by zero and Integer overflow was found in the Linux kernel V4L2 and vivid test code functionality. This issue occurs when a user triggers ioctls, such as VIDIOC_S_DV_TIMINGS ioctl. This could allow a local user to crash the system if vivid test code enabled.(CVE-2023-0615)

The Linux kernel does not correctly mitigate SMT attacks, as discovered
through a strange pattern in the kernel API using STIBP as a mitigation[1
&lt;https://docs.kernel.org/userspace-api/spec_ctrl.html&gt;], leaving the
process exposed for a short period of time after a syscall. The kernel also
does not issue an IBPB immediately during the syscall.
The ib_prctl_set [2
&lt;https://elixir.bootlin.com/linux/v5.15.56/source/arch/x86/kernel/cpu/bugs.c#L1467&gt;]function
updates the Thread Information Flags (TIFs) for the task and updates the
SPEC_CTRL MSR on the function __speculation_ctrl_update [3
&lt;https://elixir.bootlin.com/linux/v5.15.56/source/arch/x86/kernel/process.c#L557&gt;],
but the IBPB is only issued on the next schedule, when the TIF bits are
checked. This leaves the victim vulnerable to values already injected on
the BTB, prior to the prctl syscall.
The behavior is only corrected after a reschedule of the task happens.
Furthermore, the kernel entrance (due to the syscall itself), does not
issue an IBPB in the default scenarios (i.e., when the kernel protects
itself via retpoline or eIBRS).(CVE-2023-0045)

REMAP cmd of SVM driver can be used to remap read only memory as read-write, then cause read only memory/file modified..(CVE-2021-33639)</Note>
		<Note Title="Topic" Type="General" Ordinal="4" xml:lang="en">An update for kernel is now available for openEuler-22.03-LTS.

openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section.</Note>
		<Note Title="Severity" Type="General" Ordinal="5" xml:lang="en">High</Note>
		<Note Title="Affected Component" Type="General" Ordinal="6" xml:lang="en">kernel</Note>
	</DocumentNotes>
	<DocumentReferences>
		<Reference Type="Self">
			<URL>https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1144</URL>
		</Reference>
		<Reference Type="openEuler CVE">
			<URL>https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2023-0240</URL>
			<URL>https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2023-0615</URL>
			<URL>https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2023-0045</URL>
			<URL>https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33639</URL>
		</Reference>
		<Reference Type="Other">
			<URL>https://nvd.nist.gov/vuln/detail/CVE-2023-0240</URL>
			<URL>https://nvd.nist.gov/vuln/detail/CVE-2023-0615</URL>
			<URL>https://nvd.nist.gov/vuln/detail/CVE-2023-0045</URL>
			<URL>https://nvd.nist.gov/vuln/detail/CVE-2021-33639</URL>
		</Reference>
	</DocumentReferences>
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	<Vulnerability Ordinal="1" xmlns="http://www.icasi.org/CVRF/schema/vuln/1.1">
		<Notes>
			<Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">There is a logic error in io_uring s implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation. In the io_prep_async_work function the assumption that the last io_grab_identity call cannot return false is not true, and in this case the function will use the init_cred or the previous linked requests identity to do operations instead of using the current identity. This can lead to reference counting issues causing use-after-free. We recommend upgrading past version 5.10.161.</Note>
		</Notes>
		<ReleaseDate>2023-03-04</ReleaseDate>
		<CVE>CVE-2023-0240</CVE>
		<ProductStatuses>
			<Status Type="Fixed">
				<ProductID>openEuler-22.03-LTS</ProductID>
			</Status>
		</ProductStatuses>
		<Threats>
			<Threat Type="Impact">
				<Description>High</Description>
			</Threat>
		</Threats>
		<CVSSScoreSets>
			<ScoreSet>
				<BaseScore>7.8</BaseScore>
				<Vector>AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H</Vector>
			</ScoreSet>
		</CVSSScoreSets>
		<Remediations>
			<Remediation Type="Vendor Fix">
				<Description>kernel security update</Description>
				<DATE>2023-03-04</DATE>
				<URL>https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1144</URL>
			</Remediation>
		</Remediations>
	</Vulnerability>
	<Vulnerability Ordinal="2" xmlns="http://www.icasi.org/CVRF/schema/vuln/1.1">
		<Notes>
			<Note Title="Vulnerability Description" Type="General" Ordinal="2" xml:lang="en">A memory leak flaw and potential divide by zero and Integer overflow was found in the Linux kernel V4L2 and vivid test code functionality. This issue occurs when a user triggers ioctls, such as VIDIOC_S_DV_TIMINGS ioctl. This could allow a local user to crash the system if vivid test code enabled.</Note>
		</Notes>
		<ReleaseDate>2023-03-04</ReleaseDate>
		<CVE>CVE-2023-0615</CVE>
		<ProductStatuses>
			<Status Type="Fixed">
				<ProductID>openEuler-22.03-LTS</ProductID>
			</Status>
		</ProductStatuses>
		<Threats>
			<Threat Type="Impact">
				<Description>Medium</Description>
			</Threat>
		</Threats>
		<CVSSScoreSets>
			<ScoreSet>
				<BaseScore>5.5</BaseScore>
				<Vector>AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H</Vector>
			</ScoreSet>
		</CVSSScoreSets>
		<Remediations>
			<Remediation Type="Vendor Fix">
				<Description>kernel security update</Description>
				<DATE>2023-03-04</DATE>
				<URL>https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1144</URL>
			</Remediation>
		</Remediations>
	</Vulnerability>
	<Vulnerability Ordinal="3" xmlns="http://www.icasi.org/CVRF/schema/vuln/1.1">
		<Notes>
			<Note Title="Vulnerability Description" Type="General" Ordinal="3" xml:lang="en">The Linux kernel does not correctly mitigate SMT attacks, as discoveredthrough a strange pattern in the kernel API using STIBP as a mitigation[1&lt;https://docs.kernel.org/userspace-api/spec_ctrl.html&gt;], leaving theprocess exposed for a short period of time after a syscall. The kernel alsodoes not issue an IBPB immediately during the syscall.The ib_prctl_set [2&lt;https://elixir.bootlin.com/linux/v5.15.56/source/arch/x86/kernel/cpu/bugs.c#L1467&gt;]functionupdates the Thread Information Flags (TIFs) for the task and updates theSPEC_CTRL MSR on the function __speculation_ctrl_update [3&lt;https://elixir.bootlin.com/linux/v5.15.56/source/arch/x86/kernel/process.c#L557&gt;],but the IBPB is only issued on the next schedule, when the TIF bits arechecked. This leaves the victim vulnerable to values already injected onthe BTB, prior to the prctl syscall.The behavior is only corrected after a reschedule of the task happens.Furthermore, the kernel entrance (due to the syscall itself), does notissue an IBPB in the default scenarios (i.e., when the kernel protectsitself via retpoline or eIBRS).</Note>
		</Notes>
		<ReleaseDate>2023-03-04</ReleaseDate>
		<CVE>CVE-2023-0045</CVE>
		<ProductStatuses>
			<Status Type="Fixed">
				<ProductID>openEuler-22.03-LTS</ProductID>
			</Status>
		</ProductStatuses>
		<Threats>
			<Threat Type="Impact">
				<Description>Medium</Description>
			</Threat>
		</Threats>
		<CVSSScoreSets>
			<ScoreSet>
				<BaseScore>5.1</BaseScore>
				<Vector>AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N</Vector>
			</ScoreSet>
		</CVSSScoreSets>
		<Remediations>
			<Remediation Type="Vendor Fix">
				<Description>kernel security update</Description>
				<DATE>2023-03-04</DATE>
				<URL>https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1144</URL>
			</Remediation>
		</Remediations>
	</Vulnerability>
	<Vulnerability Ordinal="4" xmlns="http://www.icasi.org/CVRF/schema/vuln/1.1">
		<Notes>
			<Note Title="Vulnerability Description" Type="General" Ordinal="4" xml:lang="en">REMAP cmd of SVM driver can be used to remap read only memory as read-write, then cause read only memory/file modified.</Note>
		</Notes>
		<ReleaseDate>2023-03-04</ReleaseDate>
		<CVE>CVE-2021-33639</CVE>
		<ProductStatuses>
			<Status Type="Fixed">
				<ProductID>openEuler-22.03-LTS</ProductID>
			</Status>
		</ProductStatuses>
		<Threats>
			<Threat Type="Impact">
				<Description>Medium</Description>
			</Threat>
		</Threats>
		<CVSSScoreSets>
			<ScoreSet>
				<BaseScore>6.7</BaseScore>
				<Vector>AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H</Vector>
			</ScoreSet>
		</CVSSScoreSets>
		<Remediations>
			<Remediation Type="Vendor Fix">
				<Description>kernel security update</Description>
				<DATE>2023-03-04</DATE>
				<URL>https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1144</URL>
			</Remediation>
		</Remediations>
	</Vulnerability>
</cvrfdoc>