QEMU: vhost-user-gpu: information disclosure due to uninitialized memory read
Published Jun 2, 2021
6.5
MEDIUMCVSS 3.1
EPSS 0.42%
Description
An information disclosure vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0. The flaw exists in virgl_cmd_get_capset_info() in contrib/vhost-user-gpu/virgl.c and could occur due to the read of uninitialized memory. A malicious guest could exploit this issue to leak memory from the host.
Affected products
- Vendor n/a Product QEMU Defaultn/a
- Version All QEMU versions up to and including 6.0StatusaffectedConstraints-
- 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 | QEMU | n/a |
|
Configuration 2
- 11.0
No data.
Red Hat Enterprise Linux 6
qemu-kvm
Not affected
Red Hat Enterprise Linux 7
qemu-kvm
Not affected
Red Hat Enterprise Linux 7
qemu-kvm-ma
Not affected
Red Hat Enterprise Linux 7
qemu-kvm-rhev
Not affected
Red Hat Enterprise Linux 8
virt:rhel/qemu-kvm
Not affected
Red Hat Enterprise Linux 8 Advanced Virtualization
virt:8.2/qemu-kvm
Fix deferred
Red Hat Enterprise Linux 8 Advanced Virtualization
virt:8.3/qemu-kvm
Not affected
Red Hat Enterprise Linux 8 Advanced Virtualization
virt:av/qemu-kvm
Not affected
Red Hat Enterprise Linux 9
qemu-kvm
Not affected
Red Hat OpenStack Platform 10 (Newton)
qemu-kvm-rhev
Not affected
Red Hat OpenStack Platform 13 (Queens)
qemu-kvm-rhev
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux 7 | qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux 7 | qemu-kvm-ma | Not affected | n/a |
| Red Hat Enterprise Linux 7 | qemu-kvm-rhev | Not affected | n/a |
| Red Hat Enterprise Linux 8 | virt:rhel/qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux 8 Advanced Virtualization | virt:8.2/qemu-kvm | Fix deferred | n/a |
| Red Hat Enterprise Linux 8 Advanced Virtualization | virt:8.3/qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux 8 Advanced Virtualization | virt:av/qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux 9 | qemu-kvm | Not affected | n/a |
| Red Hat OpenStack Platform 10 (Newton) | qemu-kvm-rhev | Not affected | n/a |
| Red Hat OpenStack Platform 13 (Queens) | qemu-kvm-rhev | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the versions of `qemu-kvm` as shipped with Red Hat Enterprise Linux 6, 7 and 8, as Virgl was not enabled in these versions. Support for Virgl was enabled as technical preview in Red Hat Enterprise Linux Advanced Virtualization 8.2, and later disabled in Red Hat Enterprise Linux Advanced Virtualization 8.3.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
1 other source (Red Hat) ▾
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:P/I:N/A:N
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 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.42% (0.00421) | 34.21th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.42% (0.00421) | 33.45th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.06% (0.00055) | 14.53th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.05% (0.00047) | 19.30th | v3 (v2023.03.01) |
| May 10, 2024 | 0.05% (0.00047) | 16.43th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00047) | 14.41th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00950) | 32.28th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00950) | 28.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.96% (0.01963) | 55.86th | v2 (v2022.01.01) |
| Feb 3, 2022 | 4.50% (0.04504) | 76.47th | v1 |
| Jan 6, 2022 | 4.50% (0.04504) | 76.26th | v1 |
| Oct 11, 2021 | 1.04% (0.01040) | 64.87th | v1 |
| Oct 5, 2021 | 4.50% (0.04504) | 84.05th | v1 |
| Oct 4, 2021 | 0.83% (0.00833) | 57.69th | v5 (v2026.06.15) |
| Jun 3, 2021 | 0.62% (0.00624) | 0.00th | v1 |
References (9)
- http://www.openwall.com/lists/oss-security/2021/05/31/1 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-3545 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1958955 x_refsource_MISCIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2021-3545
- https://security.gentoo.org/glsa/202208-27 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.netapp.com/advisory/ntap-20210720-0008/ x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2021-3545
- https://www.debian.org/security/2021/dsa-4980 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.openwall.com/lists/oss-security/2021/05/31/1
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2021/05/31/1 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2021-3545 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1958955 | x_refsource_MISCIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2021-3545 | ||
| https://security.gentoo.org/glsa/202208-27 | vendor-advisoryx_refsource_GENTOOThird Party Advisory | |
| https://security.netapp.com/advisory/ntap-20210720-0008/ | x_refsource_CONFIRMThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2021-3545 | ||
| https://www.debian.org/security/2021/dsa-4980 | vendor-advisoryx_refsource_DEBIANThird Party Advisory | |
| https://www.openwall.com/lists/oss-security/2021/05/31/1 |
Change history (0)
No recorded changes yet.