CVE-2021-4095

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Summary

CVECVE-2021-4095
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-03-10 17:44:00 UTC
Updated2023-11-07 03:40:00 UTC
DescriptionA 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.

Risk And Classification

Problem Types: CWE-476

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 34 All All All
Operating System Fedoraproject Fedora 35 All All All
Operating System Linux Linux Kernel All All All All

References

ReferenceSourceLinkTags
[SECURITY] Fedora 34 Update: kernel-tools-5.17.4-100.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 35 Update: kernel-5.17.4-200.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 35 Update: kernel-5.17.4-200.fc35 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
2031194 – (CVE-2021-4095) CVE-2021-4095 kernel: KVM: NULL pointer dereference in kvm_dirty_ring_get() in virt/kvm/dirty_ring.c MISC bugzilla.redhat.com
oss-security - Re: CVE-2021-4095: kernel: KVM: NULL pointer dereference in kvm_dirty_ring_get() in virt/kvm/dirty_ring.c MLIST www.openwall.com
[SECURITY] Fedora 34 Update: kernel-tools-5.17.4-100.fc34 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 181963 Debian Security Update for linux (CVE-2021-4095)
  • 282604 Fedora Security Update for kernel (FEDORA-2022-8efcea6e67)
  • 282605 Fedora Security Update for kernel (FEDORA-2022-0816754490)
  • 900750 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8944)
  • 900873 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8965)
  • 902111 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8965-1)
  • 905746 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8944-1)
  • 906486 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8965-2)
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