{"id":"CVE-2026-93834","aliases":["AZL-105278","BELL-CVE-2026-93834","DEBIAN-CVE-2026-93834","EUVD-2026-87092","GHSA-86c2-8qp8-q2vh","OESA-2026-4584","OESA-2026-4585","OESA-2026-4586","OESA-2026-4587","SUSE-SU-2026:24115-1","SUSE-SU-2026:24159-1","UBUNTU-CVE-2026-93834","openSUSE-SU-2026:12049-1","openSUSE-SU-2026:22047-1"],"status":"published","title":"Qemu-kvm: 9pfs: use-after-free race in tlcreate/twalk allows vm guest escape","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.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00405,"percentile":0.35188,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-416"],"published":"2026-09-25T13:36:17Z","modified":"2026-11-07T07:15:05Z","exploits":[{"source":"pocgithub","id":"suominen/CVE-2026-93834","title":"suominen/CVE-2026-93834","date":"2026-09-26","url":"https://github.com/suominen/CVE-2026-93834"}],"fixes":[{"ecosystem":"Azure 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(queens)"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-93834","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2537939","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://gitlab.com/qemu-project/qemu/-/work_items/4491","tags":["exploit"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93834","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-86c2-8qp8-q2vh"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-93834","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-93834","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4584","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4585","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4586","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4587","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202624115-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1263864","tags":["report"]},{"url":"https://bugzilla.suse.com/1279962","tags":["report"]},{"url":"https://bugzilla.suse.com/1282077","tags":["report"]},{"url":"https://bugzilla.suse.com/1282578","tags":["report"]},{"url":"https://bugzilla.suse.com/1282918","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-81627","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93834","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202624159-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-93834","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93834","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-93834","title":"Qemu-kvm: 9pfs: use-after-free race in tlcreate/twalk allows vm guest escape","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.","status":"published","published":"2026-09-25T13:36:17.597Z","modified":"2026-10-31T07:56:30.823Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:19:54.122945Z"}],"euvd":[{"id":"EUVD-2026-87092","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.","status":"published","published":"2026-09-25T13:36:17Z","modified":"2026-11-05T00:12:18Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-05T01:48:37.947628Z"}],"ghsa":[{"id":"GHSA-86c2-8qp8-q2vh","title":"A use-after-free vulnerability was found in QEMU's 9pfs subsystem. A race condition between the...","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.","status":"published","published":"2026-09-25T15:31:48Z","modified":"2026-09-25T15:31:54Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:12:27.190195Z"}],"nvd":[{"id":"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.","status":"published","published":"2026-09-25T14:17:24.063Z","modified":"2026-11-05T01:17:24.237Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-05T06:56:40.786164Z"}],"osv":[{"id":"BELL-CVE-2026-93834","status":"published","published":"2026-09-26T06:04:27.896106Z","modified":"2026-11-07T07:15:05.905685647Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-07T07:40:27.39378Z"},{"id":"DEBIAN-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.","status":"published","published":"2026-09-25T14:17:24.063Z","modified":"2026-11-05T09:47:39.153332696Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-05T13:31:24.64316Z"},{"id":"OESA-2026-4584","title":"qemu security update","description":"QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed.\r\n\r\nSecurity Fix(es):\n\nA use-after-free vulnerability was found in QEMU\u0026apos;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.(CVE-2026-93834)","status":"published","published":"2026-10-29T09:03:14Z","modified":"2026-10-29T09:15:35.99464916Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4585","title":"qemu security update","description":"QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed.\r\n\r\nSecurity Fix(es):\n\nA use-after-free vulnerability was found in QEMU\u0026apos;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.(CVE-2026-93834)","status":"published","published":"2026-10-29T09:03:15Z","modified":"2026-10-29T09:15:35.994687023Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4586","title":"qemu security update","description":"QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed.\r\n\r\nSecurity Fix(es):\n\nA use-after-free vulnerability was found in QEMU\u0026apos;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.(CVE-2026-93834)","status":"published","published":"2026-10-29T09:03:15Z","modified":"2026-10-29T09:15:35.055128509Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4587","title":"qemu security update","description":"QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed.\r\n\r\nSecurity Fix(es):\n\nA use-after-free vulnerability was found in QEMU\u0026apos;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.(CVE-2026-93834)","status":"published","published":"2026-10-29T09:03:16Z","modified":"2026-10-29T09:15:35.99418074Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"UBUNTU-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.","status":"published","published":"2026-09-25T14:17:00Z","modified":"2026-10-22T23:20:38.307294942Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:44.071534Z"},{"id":"AZL-105278","title":"CVE-2026-93834 affecting package qemu for versions less than 10.1.0-2","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.","status":"published","published":"2026-09-25T14:17:24Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:17.719431Z"},{"id":"openSUSE-SU-2026:12049-1","title":"qemu-11.1.1-2.1 on GA media","description":"These are all security issues fixed in the qemu-11.1.1-2.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-04T00:00:00Z","modified":"2026-10-05T10:15:39.709916832Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"id":"openSUSE-SU-2026:22047-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2026-81627: missing writable RAM alias validation in the VAPIC setup hypercall allows a privileged guest user to\n  bypass chipset `D_LCK` protection and injecting code into System Management Mode memory (bsc#1282077).\n- CVE-2026-93834: hw/9pfs: mutate FID path from main thread only (bsc#1282578).\n\nChanges for qemu:\n\n- Bugfixes:\n * [openSUSE][RPM] spec: drop qemu-ipxe Requires for ppc (bsc#1282918)\n * virtio: fix queue size validation against allocated maximum (bsc#1279962)\n * virtio-mmio: fix QUEUE_NUM_MAX (bsc#1279962)\n * target/ppc/kvm: Use host compatibility mode for nested guests (bsc#1263864)\n * target/ppc/kvm: Add support for querying host compatibility mode (bsc#1263864)\n * linux-headers: Update to include KVM_CAP_PPC_COMPAT_CAPS (bsc#1263864)\n * linux-headers: Update to Linux v7.2-rc1 with KVM_S390_VM_CPU_FEAT_ASTFLEIE2 (bsc#1263864)\n * linux-headers: Update to Linux v7.1-rc4 (bsc#1263864)\n * scripts/update-linux-headers: Add typelimits.h (bsc#1263864)\n * update-linux-headers: Inject VIRTIO_RING_NO_LEGACY in virtio_ring.h (bsc#1263864)\n * linux-headers: Add nitro_enclaves.h (bsc#1263864)\n * scripts/update-linux-headers: Add Nitro Enclaves header (bsc#1263864)\n * standard-headers: Update virtio_spi.h from Linux v6.18-rc3 (bsc#1263864)\n * linux-headers: Update to Linux v6.19-rc1 (bsc#1263864)\n * update-linux-headers: Remove \"asm-s390/unistd_32.h\" (bsc#1263864)\n * linux-headers: Update to Linux v6.18-rc3 (bsc#1263864)\n * linux-headers/linux: Add mshv.h headers (bsc#1263864)\n * include/hw/hyperv: Add MSHV ABI header definitions (bsc#1263864)\n * linux-headers: Update to Linux v6.17-rc1 (bsc#1263864)\n * linux-headers: deal with counted_by annotation (bsc#1263864)\n * linux-headers: Remove the 32-bit arm headers (bsc#1263864)\n * update Linux headers to KVM tree master (bsc#1263864)\n","status":"published","published":"2026-10-07T09:59:52Z","modified":"2026-10-19T17:23:10.63778804Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"SUSE-SU-2026:24115-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2026-81627: missing writable RAM alias validation in the VAPIC setup hypercall allows a privileged guest user to\n  bypass chipset `D_LCK` protection and injecting code into System Management Mode memory (bsc#1282077).\n- CVE-2026-93834: hw/9pfs: mutate FID path from main thread only (bsc#1282578).\n\nChanges for qemu:\n\n- Bugfixes:\n * [openSUSE][RPM] spec: drop qemu-ipxe Requires for ppc (bsc#1282918)\n * virtio: fix queue size validation against allocated maximum (bsc#1279962)\n * virtio-mmio: fix QUEUE_NUM_MAX (bsc#1279962)\n * target/ppc/kvm: Use host compatibility mode for nested guests (bsc#1263864)\n * target/ppc/kvm: Add support for querying host compatibility mode (bsc#1263864)\n * linux-headers: Update to include KVM_CAP_PPC_COMPAT_CAPS (bsc#1263864)\n * linux-headers: Update to Linux v7.2-rc1 with KVM_S390_VM_CPU_FEAT_ASTFLEIE2 (bsc#1263864)\n * linux-headers: Update to Linux v7.1-rc4 (bsc#1263864)\n * scripts/update-linux-headers: Add typelimits.h (bsc#1263864)\n * update-linux-headers: Inject VIRTIO_RING_NO_LEGACY in virtio_ring.h (bsc#1263864)\n * linux-headers: Add nitro_enclaves.h (bsc#1263864)\n * scripts/update-linux-headers: Add Nitro Enclaves header (bsc#1263864)\n * standard-headers: Update virtio_spi.h from Linux v6.18-rc3 (bsc#1263864)\n * linux-headers: Update to Linux v6.19-rc1 (bsc#1263864)\n * update-linux-headers: Remove \"asm-s390/unistd_32.h\" (bsc#1263864)\n * linux-headers: Update to Linux v6.18-rc3 (bsc#1263864)\n * linux-headers/linux: Add mshv.h headers (bsc#1263864)\n * include/hw/hyperv: Add MSHV ABI header definitions (bsc#1263864)\n * linux-headers: Update to Linux v6.17-rc1 (bsc#1263864)\n * linux-headers: deal with counted_by annotation (bsc#1263864)\n * linux-headers: Remove the 32-bit arm headers (bsc#1263864)\n * update Linux headers to KVM tree master (bsc#1263864)\n","status":"published","published":"2026-10-07T09:57:02Z","modified":"2026-10-10T17:23:22.302178315Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:24159-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2026-81627: missing writable RAM alias validation in the VAPIC setup hypercall allows a privileged guest user to\n  bypass chipset `D_LCK` protection and injecting code into System Management Mode memory (bsc#1282077).\n- CVE-2026-93834: hw/9pfs: mutate FID path from main thread only (bsc#1282578).\n\nChanges for qemu:\n\n- Bugfixes:\n * [openSUSE][RPM] spec: drop qemu-ipxe Requires for ppc (bsc#1282918)\n * virtio: fix queue size validation against allocated maximum (bsc#1279962)\n * virtio-mmio: fix QUEUE_NUM_MAX (bsc#1279962)\n * target/ppc/kvm: Use host compatibility mode for nested guests (bsc#1263864)\n * target/ppc/kvm: Add support for querying host compatibility mode (bsc#1263864)\n * linux-headers: Update to include KVM_CAP_PPC_COMPAT_CAPS (bsc#1263864)\n * linux-headers: Update to Linux v7.2-rc1 with KVM_S390_VM_CPU_FEAT_ASTFLEIE2 (bsc#1263864)\n * linux-headers: Update to Linux v7.1-rc4 (bsc#1263864)\n * scripts/update-linux-headers: Add typelimits.h (bsc#1263864)\n * update-linux-headers: Inject VIRTIO_RING_NO_LEGACY in virtio_ring.h (bsc#1263864)\n * linux-headers: Add nitro_enclaves.h (bsc#1263864)\n * scripts/update-linux-headers: Add Nitro Enclaves header (bsc#1263864)\n * standard-headers: Update virtio_spi.h from Linux v6.18-rc3 (bsc#1263864)\n * linux-headers: Update to Linux v6.19-rc1 (bsc#1263864)\n * update-linux-headers: Remove \"asm-s390/unistd_32.h\" (bsc#1263864)\n * linux-headers: Update to Linux v6.18-rc3 (bsc#1263864)\n * linux-headers/linux: Add mshv.h headers (bsc#1263864)\n * include/hw/hyperv: Add MSHV ABI header definitions (bsc#1263864)\n * linux-headers: Update to Linux v6.17-rc1 (bsc#1263864)\n * linux-headers: deal with counted_by annotation (bsc#1263864)\n * linux-headers: Remove the 32-bit arm headers (bsc#1263864)\n * update Linux headers to KVM tree master (bsc#1263864)\n","status":"published","published":"2026-10-07T09:57:02Z","modified":"2026-10-16T17:23:11.645174207Z","updated_at":"2026-11-02T15:54:04.519245Z"}]}}