Bug 1671904 (CVE-2019-7221)
| Summary: | CVE-2019-7221 Kernel: KVM: nVMX: use-after-free of the hrtimer for emulation of the preemption timer | ||
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| Product: | [Other] Security Response | Reporter: | Prasad Pandit <ppandit> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | acaringi, airlied, asavkov, bhu, blc, brdeoliv, bskeggs, dedgar, dhoward, dvlasenk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jkacur, joe.lawrence, john.j5live, jonathan, josef, jpoimboe, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, pbonzini, plougher, rt-maint, rvrbovsk, security-response-team, steved, williams |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: |
A use-after-free vulnerability was found in the way the Linux kernel's KVM hypervisor emulates a preemption timer for L2 guests when nested (=1) virtualization is enabled. This high resolution timer(hrtimer) runs when a L2 guest is active. After VM exit, the sync_vmcs12() timer object is stopped. The use-after-free occurs if the timer object is freed before calling sync_vmcs12() routine. A guest user/process could use this flaw to crash the host kernel resulting in a denial of service or, potentially, gain privileged access to a system.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2019-06-10 10:47:13 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1671905, 1671906, 1671907, 1671908, 1673676, 1673841, 1673842, 1717815, 1740272, 1740273, 1740274, 1740275 | ||
| Bug Blocks: | 1671898 | ||
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Description
Prasad Pandit
2019-02-02 05:20:00 UTC
Acknowledgments: Name: Felix Wilhelm (Google) Statement: This issue does not affect the version of the kernel package as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2. This issue affects the versions of Linux kernel as shipped with Red Hat Enterprise Linux 7. Future kernel updates for Red Hat Enterprise Linux 7 may address this issue. Note: Impact on Red Hat Enterprise Linux 7 kernel is limited, as it requires that nested virtualization feature is enabled on a system. Nested Virtualization feature is available only as - Technology Preview. Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1673676] This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:0833 https://access.redhat.com/errata/RHSA-2019:0833 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:0818 https://access.redhat.com/errata/RHSA-2019:0818 This issue has been addressed in the following products: Red Hat Enterprise Linux 7.5 Extended Update Support Via RHSA-2019:3967 https://access.redhat.com/errata/RHSA-2019:3967 This issue has been addressed in the following products: Red Hat Enterprise Linux 7.4 Advanced Update Support Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions Red Hat Enterprise Linux 7.4 Telco Extended Update Support Via RHSA-2019:4058 https://access.redhat.com/errata/RHSA-2019:4058 |