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CVE-2021-20257

Status Candidate

Overview

An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Related Files

Gentoo Linux Security Advisory 202208-27
Posted Aug 15, 2022
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202208-27 - Multiple vulnerabilities have been discovered in QEMU, the worst of which could result in remote code execution (guest sandbox escape). Versions less than 7.0.0 are affected.

tags | advisory, remote, vulnerability, code execution
systems | linux, gentoo
advisories | CVE-2020-15859, CVE-2020-15863, CVE-2020-16092, CVE-2020-35504, CVE-2020-35505, CVE-2020-35506, CVE-2020-35517, CVE-2021-20203, CVE-2021-20257, CVE-2021-20263, CVE-2021-3409, CVE-2021-3416, CVE-2021-3527, CVE-2021-3544
SHA-256 | ad311203dff6a2553339d7456d04215ce76124a29b19165d124b263667c89b9c
Red Hat Security Advisory 2022-0081-03
Posted Jan 12, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-0081-03 - The Advanced Virtualization module provides the user-space component for running virtual machines that use KVM in environments managed by Red Hat products.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-20257, CVE-2021-3930
SHA-256 | ed2aa200711dad8069fe7e18296db0ca281fe1d5f8e59fd39f90bfeb17cac0c3
Red Hat Security Advisory 2021-5238-02
Posted Dec 22, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-5238-02 - Kernel-based Virtual Machine offers a full virtualization solution for Linux on numerous hardware platforms. The virt:rhel module contains packages which provide user-space components used to run virtual machines using KVM. The packages also provide APIs for managing and interacting with the virtualized systems.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2021-20257, CVE-2021-3930
SHA-256 | 03fcb0265966a785783f554582077e70cb5b7d4209ae9099daed4d2ad3bdfc14
Ubuntu Security Notice USN-5010-1
Posted Jul 15, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5010-1 - 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. 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. Various other issues were also addressed.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2020-15469, CVE-2020-29443, CVE-2020-35505, CVE-2020-35517, CVE-2021-20221, CVE-2021-20257, CVE-2021-3392, CVE-2021-3409, CVE-2021-3416, CVE-2021-3527, CVE-2021-3544, CVE-2021-3545, CVE-2021-3546, CVE-2021-3593, CVE-2021-3594, CVE-2021-3595, CVE-2021-3608
SHA-256 | c4d63dc41ceb7caa0f49a3eacc4d8caaa17252efd4913df4a83ba610c5446f40
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