fkie_cve-2024-27066
Vulnerability from fkie_nvd
Published
2024-05-01 13:15
Modified
2024-11-21 09:03
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/51bacd9d29bf98c3ebc65e4a0477bb86306b4140
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/75450ff8c6fe8755bf5b139b238eaf9739cfd64e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e142169aca5546ae6619c39a575cda8105362100
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/51bacd9d29bf98c3ebc65e4a0477bb86306b4140
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/75450ff8c6fe8755bf5b139b238eaf9739cfd64e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e142169aca5546ae6619c39a575cda8105362100
Impacted products
Vendor Product Version


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{
   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "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.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: virtio: empaquetado: corrige la fuga de desasignación para la tabla desc indirecta Cuando use_dma_api y premapped son verdaderos, entonces do_unmap es falso. Debido a que do_unmap es falso, detach_buf_packed no llama a vring_unmap_extra_packed. if (improbable(vq-&gt;do_unmap)) { curr = id; for (i = 0; i &lt; estado-&gt;num; i++) { vring_unmap_extra_packed(vq, &amp;vq-&gt;packed.desc_extra[curr]); curr = vq-&gt;packed.desc_extra[curr].next; } } Por lo tanto, la tabla de descripción indirecta no está desasignada. Esto provoca la fuga de desasignación. Así que aquí marcamos vq-&gt;use_dma_api en su lugar. Sincrónicamente, la información de dma se actualiza según el criterio use_dma_api. Este error no ocurre porque ningún controlador utiliza el preasignado con indirecto.",
      },
   ],
   id: "CVE-2024-27066",
   lastModified: "2024-11-21T09:03:47.367",
   metrics: {},
   published: "2024-05-01T13:15:50.850",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://git.kernel.org/stable/c/51bacd9d29bf98c3ebc65e4a0477bb86306b4140",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://git.kernel.org/stable/c/75450ff8c6fe8755bf5b139b238eaf9739cfd64e",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://git.kernel.org/stable/c/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://git.kernel.org/stable/c/e142169aca5546ae6619c39a575cda8105362100",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://git.kernel.org/stable/c/51bacd9d29bf98c3ebc65e4a0477bb86306b4140",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://git.kernel.org/stable/c/75450ff8c6fe8755bf5b139b238eaf9739cfd64e",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://git.kernel.org/stable/c/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://git.kernel.org/stable/c/e142169aca5546ae6619c39a575cda8105362100",
      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Awaiting Analysis",
}


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