{"id":"CVE-2026-93827","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-fs: avoid double-free on failed queue setup\n\nvirtio_fs_setup_vqs() allocates fs->vqs and fs->mq_map before calling\nvirtio_find_vqs()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-fs: avoid double-free on failed queue setup\n\nvirtio_fs_setup_vqs() allocates fs->vqs and fs->mq_map before calling\nvirtio_find_vqs(). If virtio_find_vqs() fails,…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3fbc5ee776fefbc6ea34d2518f1f5f90aa2e1dad","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 20ef4739b329bb09cff11dd2458795a50674658e","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6af3330ec5d5fb8c06c04eb520a71cf73ea5a765","Linux < 6.12.111","Linux < 6.18.53","Linux (all versions)"],"published":"2026-09-24","updated":"2026-09-25","sourceUpdated":"2026-09-25T13:17:23.513","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93827","references":[{"url":"https://git.kernel.org/stable/c/20ef4739b329bb09cff11dd2458795a50674658e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3fbc5ee776fefbc6ea34d2518f1f5f90aa2e1dad","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6af3330ec5d5fb8c06c04eb520a71cf73ea5a765","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-24T16:47:15.890Z","slug":"CVE-2026-93827","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-fs: avoid double-free on failed queue setup\n\nvirtio_fs_setup_vqs() allocates fs->vqs and fs->mq_map before calling\nvirtio_find_vqs(). If virtio_find_vqs() fails, the error path frees both\npointers and returns an error to virtio_fs_probe().\n\nvirtio_fs_probe() then drops the last kobject reference, and\nvirtio_fs_ktype_release() frees fs->vqs and fs->mq_map again. This leaves\ndangling pointers in struct virtio_fs and can trigger a double-free during\nprobe failure cleanup.\n\nSet fs->vqs and fs->mq_map to NULL immediately after kfree() in the\nvirtio_fs_setup_vqs() error path so that the later kobject release sees an\nuninitialized state and kfree(NULL) becomes harmless.\n\nThis can be reproduced when a broken virtio-fs device advertises more\nrequest queues than the transport actually provides. In that case\nvirtio_find_vqs() fails while setting up the extra queue, and the probe\npath reaches the double-free cleanup sequence.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":210569,"id":"CVE-2026-93827","ts":1790316054870,"field":"cvss","old":null,"new":"8.4"},{"seq":210568,"id":"CVE-2026-93827","ts":1790316054870,"field":"severity","old":"none","new":"high"}]}