CWE
193
Advisory Published
CVE Published
Updated

CVE-2021-3930

First published: Fri Nov 05 2021(Updated: )

An off-by-one error was found in the SCSI Device emulation in QEMU. It could occur in hw/scsi/scsi-disk.c:mode_sense_page() while processing MODE SELECT commands if 'page' was set to MODE_PAGE_ALLS (0x3f). Specifically, 'page' was used to index the stack-allocated 'mode_sense_valid' buffer (size=0x3f), causing an off-by-one error when trying to access the last element. A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/qemu-kvm<6.2.0
6.2.0
QEMU qemu<6.2.0
Redhat Codeready Linux Builder=8.0
Redhat Codeready Linux Builder For Ibm Z Systems=8.0
Redhat Codeready Linux Builder For Power Little Endian=8.0
Redhat Openstack=10
Redhat Openstack=13
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux Advanced Virtualization Eus=8.4
Redhat Enterprise Linux For Ibm Z Systems=8.0
Redhat Enterprise Linux For Power Little Endian=8.0
Debian Debian Linux=9.0
Debian Debian Linux=10.0
debian/qemu<=1:5.2+dfsg-11+deb11u2
1:5.2+dfsg-11+deb11u3
1:7.2+dfsg-7+deb12u7
1:9.1.2+ds-1

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Frequently Asked Questions

  • What is CVE-2021-3930?

    CVE-2021-3930 is an off-by-one error found in the SCSI device emulation in QEMU.

  • How does CVE-2021-3930 affect QEMU?

    CVE-2021-3930 could potentially crash QEMU, resulting in a denial of service condition.

  • Which software versions are affected by CVE-2021-3930?

    QEMU versions up to and excluding 6.2.0 are affected by CVE-2021-3930.

  • What is the severity of CVE-2021-3930?

    CVE-2021-3930 has a severity rating of 6.5 (medium).

  • Where can I find more information about CVE-2021-3930?

    You can find more information about CVE-2021-3930 on the Red Hat Bugzilla and NetApp security advisory websites, as well as the Debian LTS announce mailing list.

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