CVE-2021-4158 — NULL Pointer Dereference in Qemu

Vendor	Product	Version range	Fixed in
debian	qemu	< qemu 1:6.2+dfsg-2 (bookworm)	qemu 1:6.2+dfsg-2 (bookworm)
msrc	azl3_qemu_6.2.0-18_on_azure_linux_3.0	—	—
msrc	azure_linux_3.0_arm	—	—
msrc	azure_linux_3.0_x64	—	—
msrc	cbl_mariner_2.0_arm	—	—
msrc	cbl_mariner_2.0_x64	—	—
qemu	qemu	—	—
qemu	qemu	>= 0 < 1:6.2+dfsg-2	1:6.2+dfsg-2
qemu	qemu	>= 0 < 1:6.2+dfsg-2	1:6.2+dfsg-2
qemu	qemu	>= 0 < 1:6.2+dfsg-2	1:6.2+dfsg-2
qemu	qemu	>= 0 < 1:2.11+dfsg-1ubuntu7.39	1:2.11+dfsg-1ubuntu7.39
qemu	qemu	>= 0 < 1:4.2-3ubuntu6.21	1:4.2-3ubuntu6.21
qemu	qemu	>= 6.0.0 < 7.0.0	7.0.0
redhat	enterprise_linux	—	—

Microsoft

A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious privileged user within the guest could use this flaw to crash the QEMU process on the host resulting in a denial of ser

vendor_msrc·2022-08-09·CVSS 6.0

CVE-2021-4158 [MEDIUM] CWE-476 A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious privileged user within the guest could use this flaw to crash the QEMU process on the host resulting in a denial of ser A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious privileged user within the guest could use this flaw to crash the QEMU process on the host resulting in a denial of service condition. 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 for more information. If impact to additional products is identified, we

Ubuntu

QEMU vulnerabilities

vendor_ubuntu·2022-02-28·CVSS 6.5

CVE-2021-3544 [MEDIUM] QEMU vulnerabilities Title: QEMU vulnerabilities Summary: Several security issues were fixed in QEMU. Gaoning Pan discovered that QEMU incorrectly handled the floppy disk emulator. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2021-20196) Gaoning Pan discovered that the QEMU vmxnet3 NIC emulator incorrectly handled certain values. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2021-20203) It was discovered that the QEMU vhost-user GPU device contained several security issues. An attacker inside the guest could use these issues to cause QEMU to crash, resulting in a denial of service, leak sensitive information, or possibly execute arbitrary code. This issue only affected Ubun

Red Hat

QEMU: NULL pointer dereference in pci_write() in hw/acpi/pcihp.c

vendor_redhat·2021-12-12·CVSS 6.0

CVE-2021-4158 [MEDIUM] CWE-476 QEMU: NULL pointer dereference in pci_write() in hw/acpi/pcihp.c QEMU: NULL pointer dereference in pci_write() in hw/acpi/pcihp.c A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition. A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition. Statement: Releases of Red Hat OpenStack Platform 15 and newer, Red Hat Virtualization 4.4 and newer consume fixes directly from the Red Hat Enterprise Linux 8 Advanced Virtualization repository. Mitigation: Mitigation for this issue is either not available or the currently available options do

Debian

CVE-2021-4158: qemu - A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious...

vendor_debian·2021·CVSS 6.0

CVE-2021-4158 [MEDIUM] CVE-2021-4158: qemu - A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious... A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition. Scope: local bookworm: resolved (fixed in 1:6.2+dfsg-2) bullseye: resolved forky: resolved (fixed in 1:6.2+dfsg-2) sid: resolved (fixed in 1:6.2+dfsg-2) trixie: resolved (fixed in 1:6.2+dfsg-2)

GHSA

GHSA-9p4w-6fpq-fpm6: A NULL pointer dereference issue was found in the ACPI code of QEMU

ghsa_unreviewed·2022-08-25

CVE-2021-4158 [MEDIUM] CWE-476 GHSA-9p4w-6fpq-fpm6: A NULL pointer dereference issue was found in the ACPI code of QEMU A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.

OSV

CVE-2021-4158: A NULL pointer dereference issue was found in the ACPI code of QEMU

osv·2022-08-24·CVSS 6.0

CVE-2021-4158 [MEDIUM] CVE-2021-4158: A NULL pointer dereference issue was found in the ACPI code of QEMU A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.

OSV

qemu vulnerabilities

osv·2022-02-28·CVSS 6.5

CVE-2021-20196 [MEDIUM] qemu vulnerabilities qemu vulnerabilities Gaoning Pan discovered that QEMU incorrectly handled the floppy disk emulator. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2021-20196) Gaoning Pan discovered that the QEMU vmxnet3 NIC emulator incorrectly handled certain values. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2021-20203) It was discovered that the QEMU vhost-user GPU device contained several security issues. An attacker inside the guest could use these issues to cause QEMU to crash, resulting in a denial of service, leak sensitive information, or possibly execute arbitrary code. This issue only affected Ubuntu 21.10. (CVE-2021-3544, CVE-2021-3545, CVE-2021-3546) It w

CVE-2021-4158: A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU…

Affected

CVSS provenance