cve-2024-27066
Vulnerability from cvelistv5
Published
2024-05-01 13:04
Modified
2024-08-02 00:27
Severity
Summary
virtio: packed: fix unmap leak for indirect desc table
References
SourceURLTags
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
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
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          "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-\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."
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    "datePublished": "2024-05-01T13:04:12.582Z",
    "dateReserved": "2024-02-19T14:20:24.216Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-27066\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-01T13:15:50.850\",\"lastModified\":\"2024-05-01T19:50:25.633\",\"vulnStatus\":\"Awaiting Analysis\",\"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-\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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: virtio: empaquetado: corrige la fuga de desasignaci\u00f3n 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-\u0026gt;do_unmap)) { curr = id; for (i = 0; i \u0026lt; estado-\u0026gt;num; i++) { vring_unmap_extra_packed(vq, \u0026amp;vq-\u0026gt;packed.desc_extra[curr]); curr = vq-\u0026gt;packed.desc_extra[curr].next; } } Por lo tanto, la tabla de descripci\u00f3n indirecta no est\u00e1 desasignada. Esto provoca la fuga de desasignaci\u00f3n. As\u00ed que aqu\u00ed marcamos vq-\u0026gt;use_dma_api en su lugar. Sincr\u00f3nicamente, la informaci\u00f3n de dma se actualiza seg\u00fan el criterio use_dma_api. Este error no ocurre porque ning\u00fan controlador utiliza el preasignado con indirecto.\"}],\"metrics\":{},\"references\":[{\"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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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