ghsa-857r-xmrg-gj95
Vulnerability from github
Published
2024-05-01 15:30
Modified
2024-05-01 15:30
Details

In 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.

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{
   affected: [],
   aliases: [
      "CVE-2024-27066",
   ],
   database_specific: {
      cwe_ids: [],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-05-01T13:15:50Z",
      severity: null,
   },
   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->do_unmap)) {\n                curr = id;\n                for (i = 0; i < state->num; i++) {\n                        vring_unmap_extra_packed(vq,\n                                                 &vq->packed.desc_extra[curr]);\n                        curr = vq->packed.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->use_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: "2024-05-01T15:30:36Z",
   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: [],
}


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