| Name | CVE-2020-35503 |
| Description | A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 979678 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| qemu (PTS) | bullseye | 1:5.2+dfsg-11+deb11u3 | vulnerable |
| bullseye (security) | 1:5.2+dfsg-11+deb11u4 | vulnerable |
| bookworm | 1:7.2+dfsg-7+deb12u13 | vulnerable |
| trixie, sid | 1:10.0.2+ds-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| qemu | source | (unstable) | (unfixed) | | | 979678 |
Notes
[trixie] - qemu <postponed> (Minor issue, revisit when fixed upstream)
[bookworm] - qemu <postponed> (Minor issue, revisit when fixed upstream)
[bullseye] - qemu <postponed> (Minor issue, revisit when fixed upstream)
[buster] - qemu <postponed> (Minor issue, waiting for sanctioned patch)
https://bugzilla.redhat.com/show_bug.cgi?id=1910346
https://lists.gnu.org/archive/html/qemu-devel/2020-12/msg06065.html
https://patchew.org/QEMU/20201224175441.67538-1-mcascell@redhat.com/
No sanctioned upstream patch as of 2025-04-19