vulnerability
Ubuntu: (CVE-2021-4095): linux vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 2 | (AV:L/AC:M/Au:N/C:N/I:N/A:P) | Mar 10, 2022 | Jun 26, 2025 | Aug 18, 2025 |
Severity
2
CVSS
(AV:L/AC:M/Au:N/C:N/I:N/A:P)
Published
Mar 10, 2022
Added
Jun 26, 2025
Modified
Aug 18, 2025
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.
Solution
no-fix-ubuntu-package
References
- CVE-2021-4095
- https://attackerkb.com/topics/CVE-2021-4095
- CWE-476
- URL-https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55749769fe608fa3f4a075e42e89d237c8e3763
- URL-https://lore.kernel.org/kvm/CAFcO6XOmoS7EacN_n6v4Txk7xL7iqRa2gABg3F7E3Naf5uG94g@mail.gmail.com/
- URL-https://patchwork.kernel.org/project/kvm/patch/[email protected]/
- URL-https://seclists.org/oss-sec/2021/q4/157
- URL-https://www.cve.org/CVERecord?id=CVE-2021-4095
NEW
Explore Exposure Command
Confidently identify and prioritize exposures from endpoint to cloud with full attack surface visibility and threat-aware risk context.