Medium severity5.5NVD Advisory· Published Mar 10, 2022· Updated Jun 17, 2026
CVE-2021-4095
CVE-2021-4095
Description
A NULL pointer dereference was found in the Linux kernel's KVM when dirty ring logging is enabled without an active vCPU context. An unprivileged local attacker on the host may use this flaw to cause a kernel oops condition and thus a denial of service by issuing a KVM_XEN_HVM_SET_ATTR ioctl. This flaw affects Linux kernel versions prior to 5.17-rc1.
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Affected products
2- Range: <5.17-rc1
Patches
Vulnerability mechanics
References
4- www.openwall.com/lists/oss-security/2022/01/17/1nvdExploitMailing ListPatchThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdExploitIssue TrackingPatchThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QIOQN7JJNN6ABIDGRSTVZA65MHRLMH2Q/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VT6573CGKVK3DU2632VVO5BVM4IU7SBV/nvd
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