| Name | CVE-2020-27821 |
| Description | A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
| NVD severity | low |
| Debian Bugs | 977616 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| qemu (PTS) | stretch | 1:2.8+dfsg-6+deb9u9 | fixed |
| stretch (security) | 1:2.8+dfsg-6+deb9u16 | fixed | |
| buster, buster (security) | 1:3.1+dfsg-8+deb10u8 | vulnerable | |
| bullseye | 1:5.2+dfsg-11 | fixed | |
| bullseye (security) | 1:5.2+dfsg-11+deb11u1 | fixed | |
| bookworm, sid | 1:6.1+dfsg-8 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| qemu | source | stretch | (not affected) | |||
| qemu | source | (unstable) | 1:5.2+dfsg-3 | 977616 |
[buster] - qemu <postponed> (Fix along in future update)
[stretch] - qemu <not-affected> (Vulnerable code introduced later)
https://bugzilla.redhat.com/show_bug.cgi?id=1902651
https://git.qemu.org/?p=qemu.git;a=commit;h=4bfb024bc76973d40a359476dc0291f46e435442
Introduced by: https://git.qemu.org/?p=qemu.git;a=commitdiff;h=48564041a73adbbff52834f9edbe3806fceefab7 (v3.0)