CVE-2026-3842
Qemu-kvm: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host oob write
CVE-2026-3842 is fixed in 25 products on 1 platform, first by qemu-block-extra 1:8.2.2+ds-0ubuntu1.16, released April 15, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.8
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0017
6th percentile
A flaw was found in QEMU. This vulnerability allows a local attacker within a guest virtual machine to write data beyond its allocated memory. This occurs when cpu_physical_memory_map() returns a shorter length than expected, leading to an out-of-bounds write. Successful exploitation could result in unauthorized access to guest memory or corruption of heap-allocated objects, potentially causing information disclosure, data integrity issues, or a denial of service.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| qemu · Debian 13.5 (trixie) | 1:10.0.10+ds-0+deb13u1 | DEBIAN-CVE-2026-3842 | Jul 18, 2026 |
| qemu · Debian 14 | 1:10.2.2+ds-1 | DEBIAN-CVE-2026-3842 | Jul 18, 2026 |
| qemu · sles 15.6 | 8.2.10-150600.3.49.1 | SUSE-SU-2026:2386-1 | Jun 12, 2026 |
| qemu · sles 15.7 | 7.1.0-150500.49.42.1 | SUSE-SU-2026:2388-1 | Jun 12, 2026 |
| qemu-block-extra · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-block-extra 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-block-extra · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-block-extra 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-block-supplemental · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-block-supplemental 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-block-supplemental · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-block-supplemental 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-guest-agent · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-guest-agent 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-guest-agent · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-guest-agent 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-linux-user · sles 15.7 | 9.2.4-150700.3.20.1 | SUSE-SU-2026:2385-1 | Jun 12, 2026 |
| qemu-system · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-arm · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-arm 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-arm · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-arm 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-common · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-common 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-common · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-common 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-data · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-data 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-data · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-data 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-gui · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-gui 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-gui · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-gui 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-mips · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-mips 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-mips · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-mips 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-misc · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-misc 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-misc · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-misc 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-modules-opengl · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-modules-opengl 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-modules-opengl · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-modules-opengl 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-modules-spice · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-modules-spice 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-modules-spice · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-modules-spice 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-ppc · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-ppc 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-ppc · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-ppc 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-riscv · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-riscv 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-s390x · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-s390x 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-s390x · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-s390x 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-sparc · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-sparc 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-sparc · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-sparc 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-x86 · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-x86 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-x86 · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-x86 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-x86-xen · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-x86-xen 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-x86-xen · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-x86-xen 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-system-xen · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-system-xen 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-system-xen · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-system-xen 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-user · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-user 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-user · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-user 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-user-binfmt · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-user-binfmt 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-user-binfmt · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-user-binfmt 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
| qemu-user-static · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-user-static 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-utils · Ubuntu 24.04.5 LTS (noble) | 1:8.2.2+ds-0ubuntu1.16 | qemu-utils 1:8.2.2+ds-0ubuntu1.16 | Apr 15, 2026 |
| qemu-utils · Ubuntu 25.10 (questing) | 1:10.1.0+ds-5ubuntu2.6 | qemu-utils 1:10.1.0+ds-5ubuntu2.6 | Apr 15, 2026 |
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