kernel: KVM: cache incoherence issue in SEV API may lead to kernel crash
Published Aug 26, 2022
5.5
MEDIUMCVSS 3.1
EPSS 0.30%
Description
A flaw was found in the Linux kernel. The existing KVM SEV API has a vulnerability that allows a non-root (host) user-level application to crash the host kernel by creating a confidential guest VM instance in AMD CPU that supports Secure Encrypted Virtualization (SEV).
Affected products
- Vendor n/a Product Kernel Defaultn/a
- Version Fixed in kernel 5.18-rc4StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Kernel | n/a |
|
Configuration 1
- < 5.18
- 5.18
- 5.18
- 5.18
- 5.18
Configuration 2
- 8.0
- 9.0
Configuration 3
- 10.0
- 11.0
No data.
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-alt
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Affected
Red Hat Enterprise Linux 8
kernel-rt
Affected
Red Hat Enterprise Linux 9
kernel
Affected
Red Hat Enterprise Linux 9
kernel-rt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-alt | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This flaw does not affect the versions of the kernel packages as shipped with Red Hat Enterprise Linux 6 and 7, as they did not include support for SEV. Red Hat Enterprise Linux 8 currently provides SEV as a Technology Preview. Using SEV in a production environment is discouraged. For additional details please see https://access.redhat.com/articles/4491591 and https://access.redhat.com/support/offerings/techpreview.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.30% (0.00297) | 20.34th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.29% (0.00288) | 20.31th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.03% (0.00027) | 4.61th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00045) | 16.02th | v3 (v2023.03.01) |
| Jun 14, 2024 | 0.04% (0.00045) | 14.22th | v3 (v2023.03.01) |
| Dec 1, 2023 | 0.04% (0.00045) | 12.20th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00950) | 32.28th | v2 (v2022.01.01) |
| Oct 22, 2022 | 0.95% (0.00950) | 31.08th | v2 (v2022.01.01) |
| Aug 27, 2022 | 0.89% (0.00890) | 28.47th | v2 (v2022.01.01) |
References (7)
- https://access.redhat.com/security/cve/CVE-2022-0171 Third Party AdvisoryVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2038940 Issue TrackingPatchThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=683412ccf61294d727ead4a73d97397396e69a6b Mailing ListPatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html mailing-listMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2022-0171
- https://www.cve.org/CVERecord?id=CVE-2022-0171
- https://www.debian.org/security/2022/dsa-5257 vendor-advisoryThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2022-0171 | Third Party AdvisoryVendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2038940 | Issue TrackingPatchThird Party Advisory | |
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=683412ccf61294d727ead4a73d97397396e69a6b | Mailing ListPatchVendor Advisory | |
| https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html | mailing-listMailing ListThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2022-0171 | ||
| https://www.cve.org/CVERecord?id=CVE-2022-0171 | ||
| https://www.debian.org/security/2022/dsa-5257 | vendor-advisoryThird Party Advisory |
Change history (0)
No recorded changes yet.