GHSA-64XH-4W8V-X8V5
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In the Linux kernel, the following vulnerability has been resolved:
virtio_console: do not free control-out buffers on remove
__send_control_msg() publishes &portdev->cpkt as the control-out virtqueue cookie. remove_vqs() walks every virtqueue and passes leftover cookies to free_buf(), which treats them as struct port_buffer and reads sgpages.
If a control message is still on c_ovq when the device is unbound, free_buf() reads past the ports_device object.
KASAN reported slab-out-of-bounds in free_buf():
free_buf
remove_vqs
virtcons_remove
unbind_store
The object was the ports_device allocated in virtcons_probe().
Drain c_ovq without freeing. The packet lives in portdev and is released with it.
{
"affected": [],
"aliases": [
"CVE-2026-97995"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:27Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio_console: do not free control-out buffers on remove\n\n__send_control_msg() publishes \u0026portdev-\u003ecpkt as the control-out\nvirtqueue cookie. remove_vqs() walks every virtqueue and passes leftover\ncookies to free_buf(), which treats them as struct port_buffer and\nreads sgpages.\n\nIf a control message is still on c_ovq when the device is unbound,\nfree_buf() reads past the ports_device object.\n\nKASAN reported slab-out-of-bounds in free_buf():\n\n\tfree_buf\n\tremove_vqs\n\tvirtcons_remove\n\tunbind_store\n\nThe object was the ports_device allocated in virtcons_probe().\n\nDrain c_ovq without freeing. The packet lives in portdev and is released\nwith it.",
"id": "GHSA-64xh-4w8v-x8v5",
"modified": "2026-09-25T12:31:32Z",
"published": "2026-09-25T12:31:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97995"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/177ee901aa2bab02e7f1f8edbb814fd5e386ed62"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/894f98e73983f37354214a89a3a7fd35bf9e3072"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a80c33488e0bbe642ed803b13a4ac8078a70b507"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f620c40ea6862feed84deb105568b21ec53a7830"
}
],
"schema_version": "1.4.0",
"severity": []
}
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