github - ghsa-857r-xmrg-gj95

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-\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": "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"
    },
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    },
    {
      "type": "WEB",
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    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

cve-2024-27066

Vulnerability from cvelistv5

Published

2024-05-01 13:04

Modified

2024-12-19 08:53

Severity ?

Summary

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.

References

▼	URL	Tags
	https://git.kernel.org/stable/c/e142169aca5546ae6619c39a575cda8105362100
	https://git.kernel.org/stable/c/75450ff8c6fe8755bf5b139b238eaf9739cfd64e
	https://git.kernel.org/stable/c/51bacd9d29bf98c3ebc65e4a0477bb86306b4140
	https://git.kernel.org/stable/c/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd

Impacted products

Vendor

Product

Version

▼

Linux

Version: b319940f83c21bb4c1fabffe68a862be879a6193
Version: b319940f83c21bb4c1fabffe68a862be879a6193
Version: b319940f83c21bb4c1fabffe68a862be879a6193
Version: b319940f83c21bb4c1fabffe68a862be879a6193

Linux

Version: 6.6

Show details on NVD website

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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