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CVE-2021-4095 A NULL pointer dereference was found in the Linux kernel's KVM when dirty ring logging is enabled without an active vCPU…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| kernel | Versions not published |
References
- [oss-security] 20220117 Re: CVE-2021-4095: kernel: KVM: NULL pointer dereference in kvm_dirty_ring_get() in virt/kvm/dirty_ring.c www.openwall.com
- bugzilla.redhat.com bugzilla.redhat.com
- FEDORA-2022-0816754490 lists.fedoraproject.org
- FEDORA-2022-8efcea6e67 lists.fedoraproject.org
Timeline
- Published
- Last modified
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