{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-27066", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.216Z", "datePublished": "2024-05-01T13:04:12.582Z", "dateUpdated": "2026-08-05T11:29:20.653Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:20.653Z" }, "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The only consumer of premapped mode is virtio-net's receive queues, and RX buffer resubmission (`try_fill_recv()`) is driven by consumption of inbound packets, so the leaking submit/detach cycle is exercised by a remote peer sending traffic to the interface. The vulnerable component is bound to the network stack and no credentials or local access are needed to drive it.\nAC:L - Nothing about the trigger depends on memory layout, timing, or a race — a remote party simply generates traffic and each buffer cycle leaks a mapping deterministically.\nPR:N - Driving virtio-net RX buffer churn requires no authentication or account on the target; an unauthenticated remote sender reaching the interface is sufficient.\nUI:N - No victim action is required; the RX refill and descriptor detach path runs automatically in NAPI context whenever packets arrive.\nS:U - The leaked DMA/IOVA resources and the exhaustion they cause are all within the same kernel security authority as the vulnerable virtio_ring code; no VM, IOMMU, or sandbox boundary is crossed by the party that can trigger the leak.\nC:N - The defect is purely a missing `dma_unmap_single()` in the accounting path — no out-of-bounds read, no kernel data reaches userspace, and the leaked swiotlb slot is never reused so its contents cannot cross-contaminate a later mapping.\nI:N - No memory is corrupted or modified by the bug itself; the stale IOMMU translation could only be abused by a deliberately malicious device or hypervisor, which under the virtio trust model already has full guest memory access, so no integrity is gained by the attacker who can actually trigger this.\nA:H - Every request leaks a streaming DMA mapping with no upper bound, exhausting swiotlb slots / IOVA space and growing IOMMU page tables and rbtree nodes until DMA mapping fails system-wide for all devices and the kernel runs out of memory — a hard denial of service, not mere degradation." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/virtio/virtio_ring.c" ], "versions": [ { "version": "b319940f83c21bb4c1fabffe68a862be879a6193", "lessThan": "e142169aca5546ae6619c39a575cda8105362100", "status": "affected", "versionType": "git" }, { "version": "b319940f83c21bb4c1fabffe68a862be879a6193", "lessThan": "75450ff8c6fe8755bf5b139b238eaf9739cfd64e", "status": "affected", "versionType": "git" }, { "version": "b319940f83c21bb4c1fabffe68a862be879a6193", "lessThan": "51bacd9d29bf98c3ebc65e4a0477bb86306b4140", "status": "affected", "versionType": "git" }, { "version": "b319940f83c21bb4c1fabffe68a862be879a6193", "lessThan": "d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/virtio/virtio_ring.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.23", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.11", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.2", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.6.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.7.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.8.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e142169aca5546ae6619c39a575cda8105362100" }, { "url": "https://git.kernel.org/stable/c/75450ff8c6fe8755bf5b139b238eaf9739cfd64e" }, { "url": "https://git.kernel.org/stable/c/51bacd9d29bf98c3ebc65e4a0477bb86306b4140" }, { "url": "https://git.kernel.org/stable/c/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd" } ], "title": "virtio: packed: fix unmap leak for indirect desc table", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-13T18:28:27.748226Z", "id": "CVE-2024-27066", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-30T14:58:09.210Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:27:57.845Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/e142169aca5546ae6619c39a575cda8105362100", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/75450ff8c6fe8755bf5b139b238eaf9739cfd64e", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/51bacd9d29bf98c3ebc65e4a0477bb86306b4140", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd", "tags": [ "x_transferred" ] } ] } ] } }