CVE-2026-93827: Linux

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: virtio-fs: avoid double-free on failed queue setup virtio_fs_setup_vqs() allocates fs->vqs and fs->mq_map before calling virtio_find_vqs(). If virtio_find_vqs() fails, the error path frees both pointers and returns an error to virtio_fs_probe(). virtio_fs_probe() then drops the last kobject reference, and virtio_fs_ktype_release() frees fs->vqs and fs->mq_map again. This leaves dangling pointers in struct virtio_fs and can trigger a double-free during probe failure cleanup. Set fs->vqs and fs->mq_map to NULL immediately after kfree() in the virtio_fs_setup_vqs() error path so that the later kobject release sees an uninitialized state and kfree(NULL) becomes harmless. This can be reproduced when a broken virtio-fs device advertises more request queues than the transport actually provides. In that case virtio_find_vqs() fails while setting up the extra queue, and the probe path reaches the double-free cleanup sequence.

Засегнати продукти

• Linux Linux: a8f62f50b4e4ea92a938fca2ec1bd108d7f210e9 преди 3fbc5ee776fefbc6ea34d2518f1f5f90aa2e1dad; a8f62f50b4e4ea92a938fca2ec1bd108d7f210e9 преди 20ef4739b329bb09cff11dd2458795a50674658e; a8f62f50b4e4ea92a938fca2ec1bd108d7f210e9 преди 6af3330ec5d5fb8c06c04eb520a71cf73ea5a765
• Linux Linux: 6.9; преди 6.9; 6.12.111 до 6.12.*; 6.18.53 до 6.18.*; от 7.2 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-93827
• https://nvd.nist.gov/vuln/detail/CVE-2026-93827
• https://git.kernel.org/stable/c/3fbc5ee776fefbc6ea34d2518f1f5f90aa2e1dad
• https://git.kernel.org/stable/c/20ef4739b329bb09cff11dd2458795a50674658e
• https://git.kernel.org/stable/c/6af3330ec5d5fb8c06c04eb520a71cf73ea5a765