# CVE-2026-93834: Qemu-kvm: 9pfs: use-after-free race in tlcreate/twalk allows vm guest escape CVE-2026-93834 is fixed in 33 products on 1 platform, first by DEBIAN-CVE-2026-93834, released October 6, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-93834 - Priority: High - CVSS: 8.8 (Important) - EPSS: 0.0041 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 25, 2026 - Weakness: Use After Free - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93834 ## Description A use-after-free vulnerability was found in QEMU's 9pfs subsystem. A race condition between the main thread and a worker thread when processing concurrent Tlcreate and Twalk requests allows a malicious guest user to craft a fid path containing stale heap data, bypassing directory traversal restrictions and escaping the shared directory boundary. This can lead to arbitrary host file read/write and code execution (VM escape) as the QEMU process user. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | qemu Debian 14 | 1:11.1.2+ds-1 | [DEBIAN-CVE-2026-93834](https://patchblox.com/security/data/fix/linux/debian-cve-2026-93834.md) | Oct 6, 2026 | | Linux | qemu amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu opensuse-leap 16.0 | 10.0.13-160000.2.1 | [OPENSUSE-SU-2026:22047-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22047-1.md) | Oct 7, 2026 | | Linux | qemu sles 16.0 | 10.0.13-160000.2.1 | [SUSE-SU-2026:24159-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24159-1.md) | Oct 7, 2026 | | Linux | qemu-common amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-common-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-debugsource amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-docs amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-guest-agent amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-guest-agent-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-img amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-img-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-kvm amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-kvm-core amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-linux-user opensuse-leap 16.0 | 10.0.13-160000.2.1 | [OPENSUSE-SU-2026:22047-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22047-1.md) | Oct 7, 2026 | | Linux | qemu-linux-user sles 16.0 | 10.0.13-160000.2.1 | [SUSE-SU-2026:24159-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24159-1.md) | Oct 7, 2026 | | Linux | qemu-pr-helper amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-pr-helper-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-aarch64 amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-aarch64-core amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-aarch64-core-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-x86 amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-x86-core amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-x86-core-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-tests amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-tests-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-tools amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-tools-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-binfmt amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-static amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-static-aarch64 amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-static-aarch64-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-static-x86 amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-static-x86-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | --- Data as of 2026-11-09T07:25:28Z UTC. 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