Bug 2213802 (CVE-2023-4155)
| Summary: | CVE-2023-4155 kernel: KVM: SEV-ES / SEV-SNP VMGEXIT double fetch vulnerability | ||
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| Product: | [Other] Security Response | Reporter: | Mauro Matteo Cascella <mcascell> |
| Component: | vulnerability | Assignee: | Nobody <nobody> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | acaringi, allarkin, bdas, bhu, chwhite, crwood, dbohanno, ddepaula, debarbos, dfreiber, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, ldoskova, lgoncalv, lleshchi, lzampier, nmurray, pbonzini, ptalbert, qzhao, rogbas, rrobaina, rvrbovsk, rysulliv, scweaver, security-response-team, sukulkar, tglozar, tyberry, vkumar, vkuznets, walters, wcosta, williams, wmealing, ycote, ymankad |
| 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 flaw was found in KVM AMD Secure Encrypted Virtualization (SEV) in the Linux kernel. A KVM guest using SEV-ES or SEV-SNP with multiple vCPUs can trigger a double fetch race condition vulnerability and invoke the `VMGEXIT` handler recursively. If an attacker manages to call the handler multiple times, they can trigger a stack overflow and cause a denial of service or potentially guest-to-host escape in kernel configurations without stack guard pages (`CONFIG_VMAP_STACK`).
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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: | |||
| Bug Depends On: | 2213805, 2213806, 2213807, 2213808, 2229642 | ||
| Bug Blocks: | 2196446 | ||
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Description
Mauro Matteo Cascella
2023-06-09 12:51:46 UTC
RHEL-6 and RHEL-7 kernels are not affected by this flaw as they did not include support for KVM AMD Secure Encrypted Virtualization (SEV). In reply to comment #0: > [..] potentially guest-to-host escape in kernel configurations without > stack guard pages (`CONFIG_VMAP_STACK`). Note that this kernel option is enabled by default in Red Hat Enterprise Linux 8 and 9. Patch series: https://patchew.org/linux/20230804173355.51753-1-pbonzini@redhat.com/ Patch: https://patchew.org/linux/20230804173355.51753-1-pbonzini@redhat.com/20230804173355.51753-3-pbonzini@redhat.com/ Created kernel tracking bugs for this issue: Affects: fedora-all [bug 2229642] This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2023:6583 https://access.redhat.com/errata/RHSA-2023:6583 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2023:6901 https://access.redhat.com/errata/RHSA-2023:6901 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2023:7077 https://access.redhat.com/errata/RHSA-2023:7077 |