CVE-2020-35504
published 2021-05-28CVE-2020-35504: A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the…
PriorityP419medium6CVSS 3.1
AVLACLPRHUINSCCNINAH
EPSS
0.34%
25.7th percentile
A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | qemu | < qemu 1:6.0+dfsg-3 (bookworm) | qemu 1:6.0+dfsg-3 (bookworm) |
| fedoraproject | fedora | — | — |
| msrc | cm1_qemu-kvm_4.2.0-48_on_cbl_mariner_1.0 | — | — |
| qemu | qemu | < 6.0.0 | 6.0.0 |
| qemu | qemu | — | — |
| qemu | qemu | >= 0 < 1:6.0+dfsg-3 | 1:6.0+dfsg-3 |
| qemu | qemu | >= 0 < 1:6.0+dfsg-3 | 1:6.0+dfsg-3 |
| qemu | qemu | >= 0 < 1:6.0+dfsg-3 | 1:6.0+dfsg-3 |
| qemu | qemu | >= 0 < 1:2.11+dfsg-1ubuntu7.37 | 1:2.11+dfsg-1ubuntu7.37 |
| qemu | qemu | >= 0 < 1:4.2-3ubuntu6.17 | 1:4.2-3ubuntu6.17 |
| ubuntu | qemu | — | — |
CVSS provenance
nvdv3.16.0MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
nvdv2.02.1LOWAV:L/AC:L/Au:N/C:N/I:N/A:P
osv6.0MEDIUM
vendor_debian6.0MEDIUM
vendor_msrc6.0MEDIUM
vendor_redhat6.0MEDIUM
vendor_ubuntu3.8LOW
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Ubuntu
QEMU regression
vendor_ubuntu·2026-06-28·CVSS 3.8
CVE-2020-11947 [LOW] QEMU regression
Title: QEMU regression
Summary: USN-8412-1 introduced a regression in QEMU
USN-8412-1 fixed vulnerabilities QEMU. On Ubuntu 20.04 LTS, the fix for
CVE-2024-4467 was incomplete and prevented the creation of boot volumes
from qcow2 images. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
Felipe Franciosi, Raphael Norwitz, and Peter Turschmid discovered that the
iSCSI block driver in QEMU incorrectly handled certain responses from an
iSCSI server. A remote attacker could possibly use this issue to cause
QEMU to crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-1711)
It was discovered that the iSCSI block driver in QEMU incorrectly handled
certain memory operations
Ubuntu
QEMU vulnerabilities
vendor_ubuntu·2026-06-09·CVSS 3.8
CVE-2021-3416 [LOW] QEMU vulnerabilities
Title: QEMU vulnerabilities
Summary: Several security issues were fixed in QEMU.
Felipe Franciosi, Raphael Norwitz, and Peter Turschmid discovered that the
iSCSI block driver in QEMU incorrectly handled certain responses from an
iSCSI server. A remote attacker could possibly use this issue to cause QEMU
to crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-1711)
It was discovered that the iSCSI block driver in QEMU incorrectly handled
certain memory operations, leading to a heap-based buffer over-read. An
attacker could possibly use this issue to expose sensitive information from
the host. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-11947)
Ziming Zhang discovered that the SM501 display driver in QEM
Ubuntu
QEMU vulnerabilities
vendor_ubuntu·2021-07-15·CVSS 2.3
CVE-2021-3594 [LOW] QEMU vulnerabilities
Title: QEMU vulnerabilities
Summary: Several security issues were fixed in QEMU.
Lei Sun discovered that QEMU incorrectly handled certain MMIO operations.
An attacker inside the guest could possibly use this issue to cause QEMU to
crash, resulting in a denial of service. (CVE-2020-15469)
Wenxiang Qian discovered that QEMU incorrectly handled certain ATAPI
commands. An attacker inside the guest could possibly use this issue to
cause QEMU to crash, resulting in a denial of service. This issue only
affected Ubuntu 21.04. (CVE-2020-29443)
Cheolwoo Myung discovered that QEMU incorrectly handled SCSI device
emulation. An attacker inside the guest could possibly use this issue to
cause QEMU to crash, resulting in a denial of service. (CVE-2020-35504,
CVE-2020-35505, CVE-2021-3392)
Alex Xu di
Microsoft
A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a
vendor_msrc·2021-05-11·CVSS 6.0
CVE-2020-35504 [MEDIUM] CWE-476 A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a
A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post
Red Hat
QEMU: NULL pointer dereference in scsi_req_continue() in hw/scsi/scsi-bus.c
vendor_redhat·2020-12-21·CVSS 6.0
CVE-2020-35504 [MEDIUM] CWE-476 QEMU: NULL pointer dereference in scsi_req_continue() in hw/scsi/scsi-bus.c
QEMU: NULL pointer dereference in scsi_req_continue() in hw/scsi/scsi-bus.c
A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Statement: This issue does not affect Red Hat Enterprise Linux, Red Hat OpenStack Platform and RHEL Advanced Virtualization, as the `qemu-kvm` package does not includ
Debian
CVE-2020-35504: qemu - A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU ...
vendor_debian·2020·CVSS 6.0
CVE-2020-35504 [MEDIUM] CVE-2020-35504: qemu - A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU ...
A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Scope: local
bookworm: resolved (fixed in 1:6.0+dfsg-3)
bullseye: open
forky: resolved (fixed in 1:6.0+dfsg-3)
sid: resolved (fixed in 1:6.0+dfsg-3)
trixie: resolved (fixed in 1:6.0+dfsg-3)
GHSA
GHSA-9hxx-56x6-jhj8: A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6
ghsa_unreviewed·2022-05-24
CVE-2020-35504 [MEDIUM] CWE-476 GHSA-9hxx-56x6-jhj8: A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6
A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
OSV
qemu vulnerabilities
osv·2021-07-15·CVSS 2.3
CVE-2020-15469 [LOW] qemu vulnerabilities
qemu vulnerabilities
Lei Sun discovered that QEMU incorrectly handled certain MMIO operations.
An attacker inside the guest could possibly use this issue to cause QEMU to
crash, resulting in a denial of service. (CVE-2020-15469)
Wenxiang Qian discovered that QEMU incorrectly handled certain ATAPI
commands. An attacker inside the guest could possibly use this issue to
cause QEMU to crash, resulting in a denial of service. This issue only
affected Ubuntu 21.04. (CVE-2020-29443)
Cheolwoo Myung discovered that QEMU incorrectly handled SCSI device
emulation. An attacker inside the guest could possibly use this issue to
cause QEMU to crash, resulting in a denial of service. (CVE-2020-35504,
CVE-2020-35505, CVE-2021-3392)
Alex Xu discovered that QEMU incorrectly handled the virtio-fs shared f
OSV
CVE-2020-35504: A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6
osv·2021-05-28·CVSS 6.0
CVE-2020-35504 [MEDIUM] CVE-2020-35504: A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6
A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
http://www.openwall.com/lists/oss-security/2021/04/16/3https://bugzilla.redhat.com/show_bug.cgi?id=1909766https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlhttps://security.gentoo.org/glsa/202208-27https://security.netapp.com/advisory/ntap-20210713-0006/https://www.openwall.com/lists/oss-security/2021/04/16/3http://www.openwall.com/lists/oss-security/2021/04/16/3https://bugzilla.redhat.com/show_bug.cgi?id=1909766https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlhttps://security.gentoo.org/glsa/202208-27https://security.netapp.com/advisory/ntap-20210713-0006/https://www.openwall.com/lists/oss-security/2021/04/16/3
2021-05-28
Published