Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | qemu | 7.1.0 – < 11.0.0 | 11.0.0 |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | qemu | 1:10.2.2+ds-1 | — |
| Debian 13 | qemu | 1:10.0.10+ds-0+deb13u1 | — |
| Debian 12 | qemu | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | qemu +1 | No fix yet | — |
| Ubuntu 26.04 LTS | qemu +1 | No fix yet | — |
| Ubuntu 25.10 | qemu | 1:10.1.0+ds-5ubuntu2.6 | — |
| Ubuntu 24.04 LTS | qemu | 1:8.2.2+ds-0ubuntu1.16 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | qemu | No fix yet | — |
| Ubuntu Pro 18.04 LTS | qemu | No fix yet | — |
| Ubuntu Pro 16.04 LTS | qemu | No fix yet | — |
| Ubuntu Pro 14.04 LTS | qemu | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | qemu | 7.1.0-150500.49.42.1 | SUSE-SU-2026:2388-1, SUSE-SU-2026:2385-1 |
| SLES 15 SP7 | qemu-linux-user | 9.2.4-150700.3.20.1 | SUSE-SU-2026:2385-1 |
| SLES 15 SP6 | qemu | 8.2.10-150600.3.49.1 | SUSE-SU-2026:2386-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | qemu | 8.2.10-150600.3.49.1 | SUSE-SU-2026:2386-1 |
| SLE Micro 5.5 | qemu | 7.1.0-150500.49.42.1 | SUSE-SU-2026:2388-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | qemu | 9.1.0-11 | — |
Advisories 4
- WID-SEC-2026-1083 QEMU: Schwachstelle ermöglicht Manipulation, Offenlegung und DoS BSI CERT-Bund (WID) · Jul 15, 2026
- SUSE-SU-2026:2386-1 Security update for qemu SUSE / openSUSE Security Updates · Jun 13, 2026
- SUSE-SU-2026:2388-1 Security update for qemu SUSE / openSUSE Security Updates · Jun 13, 2026
- SUSE-SU-2026:2385-1 Security update for qemu SUSE / openSUSE Security Updates · Jun 13, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-3842 vdb-entry
- RHBZ#2458150 issue-tracking