GHSA-857R-XMRG-GJ95
Vulnerability from github – Published: 2024-05-01 15:30 – Updated: 2025-09-18 18:30In the Linux kernel, the following vulnerability has been resolved:
virtio: packed: fix unmap leak for indirect desc table
When use_dma_api and premapped are true, then the do_unmap is false.
Because the do_unmap is false, vring_unmap_extra_packed is not called by detach_buf_packed.
if (unlikely(vq->do_unmap)) { curr = id; for (i = 0; i < state->num; i++) { vring_unmap_extra_packed(vq, &vq->packed.desc_extra[curr]); curr = vq->packed.desc_extra[curr].next; } }
So the indirect desc table is not unmapped. This causes the unmap leak.
So here, we check vq->use_dma_api instead. Synchronously, dma info is updated based on use_dma_api judgment
This bug does not occur, because no driver use the premapped with indirect.
{
"affected": [],
"aliases": [
"CVE-2024-27066"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-01T13:15:50Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio: packed: fix unmap leak for indirect desc table\n\nWhen use_dma_api and premapped are true, then the do_unmap is false.\n\nBecause the do_unmap is false, vring_unmap_extra_packed is not called by\ndetach_buf_packed.\n\n if (unlikely(vq-\u003edo_unmap)) {\n curr = id;\n for (i = 0; i \u003c state-\u003enum; i++) {\n vring_unmap_extra_packed(vq,\n \u0026vq-\u003epacked.desc_extra[curr]);\n curr = vq-\u003epacked.desc_extra[curr].next;\n }\n }\n\nSo the indirect desc table is not unmapped. This causes the unmap leak.\n\nSo here, we check vq-\u003euse_dma_api instead. Synchronously, dma info is\nupdated based on use_dma_api judgment\n\nThis bug does not occur, because no driver use the premapped with\nindirect.",
"id": "GHSA-857r-xmrg-gj95",
"modified": "2025-09-18T18:30:21Z",
"published": "2024-05-01T15:30:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27066"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/51bacd9d29bf98c3ebc65e4a0477bb86306b4140"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/75450ff8c6fe8755bf5b139b238eaf9739cfd64e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e142169aca5546ae6619c39a575cda8105362100"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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