{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-52910", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-21T06:07:11.015Z", "datePublished": "2024-08-21T06:10:51.337Z", "dateUpdated": "2026-08-05T09:11:57.069Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:11:57.069Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/iova: Fix alloc iova overflows issue\n\nIn __alloc_and_insert_iova_range, there is an issue that retry_pfn\noverflows. The value of iovad->anchor.pfn_hi is ~0UL, then when\niovad->cached_node is iovad->anchor, curr_iova->pfn_hi + 1 will\noverflow. As a result, if the retry logic is executed, low_pfn is\nupdated to 0, and then new_pfn < low_pfn returns false to make the\nallocation successful.\n\nThis issue occurs in the following two situations:\n1. The first iova size exceeds the domain size. When initializing\niova domain, iovad->cached_node is assigned as iovad->anchor. For\nexample, the iova domain size is 10M, start_pfn is 0x1_F000_0000,\nand the iova size allocated for the first time is 11M. The\nfollowing is the log information, new->pfn_lo is smaller than\niovad->cached_node.\n\nExample log as follows:\n[ 223.798112][T1705487] sh: [name:iova&]__alloc_and_insert_iova_range\nstart_pfn:0x1f0000,retry_pfn:0x0,size:0xb00,limit_pfn:0x1f0a00\n[ 223.799590][T1705487] sh: [name:iova&]__alloc_and_insert_iova_range\nsuccess start_pfn:0x1f0000,new->pfn_lo:0x1efe00,new->pfn_hi:0x1f08ff\n\n2. The node with the largest iova->pfn_lo value in the iova domain\nis deleted, iovad->cached_node will be updated to iovad->anchor,\nand then the alloc iova size exceeds the maximum iova size that can\nbe allocated in the domain.\n\nAfter judging that retry_pfn is less than limit_pfn, call retry_pfn+1\nto fix the overflow issue." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is in the IOVA allocator used by dma-iommu (and related drivers); it is reached when a local process causes a DMA mapping larger than the IOVA domain via device interfaces such as V4L2/DRM/camera on MediaTek platforms, not via network packet processing.\nAC:L - Triggering is deterministic once an allocation exceeds the domain size while cached_node is the anchor (empty domain or after freeing the top IOVA): the pfn_hi+1 wrap to 0 reliably makes the oversized alloc succeed, and the attacker controls buffer size and alloc/free sequencing.\nPR:L - On the highest-impact deployments (MediaTek Android phones with small per-device IOVA regions), unprivileged apps can request large DMA-mapped media/GPU buffers through standard device nodes without real root or init-namespace capabilities.\nUI:N - The attacking process alone issues the buffer allocations/DMA maps that hit the overflow path; no separate victim action is required.\nS:C - On MediaTek IOMMU, multiple IOVA regions share one page table and rely on software apertures for isolation; allocating below start_pfn installs translations into another device region's IOVA space, breaking the IOMMU/DMA isolation boundary between device groups.\nC:H - Cross-region PTE installation in the shared page table can redirect another device's DMA reads onto attacker-controlled buffers or expose other devices' memory via confused DMA mappings, yielding a high-impact disclosure primitive.\nI:H - The same out-of-aperture mapping can overwrite or collide with another master's IOVA translations in the shared pgtable, so device DMA writes land on the wrong physical pages — a high-integrity memory corruption primitive across the DMA isolation boundary.\nA:H - Conflicting IOVA translations and DMA to addresses outside the intended aperture reliably produce IOMMU faults, WARN_ONs in the page-table code, and kernel oopses/panics." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iommu/iova.c" ], "versions": [ { "version": "4e89dce725213d3d0b0475211b500eda4ef4bf2f", "lessThan": "c929a230c84441e400c32e7b7b4ab763711fb63e", "status": "affected", "versionType": "git" }, { "version": "4e89dce725213d3d0b0475211b500eda4ef4bf2f", "lessThan": "61cbf790e7329ed78877560be7136f0b911bba7f", "status": "affected", "versionType": "git" }, { "version": "4e89dce725213d3d0b0475211b500eda4ef4bf2f", "lessThan": "dcdb3ba7e2a8caae7bfefd603bc22fd0ce9a389c", "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/iommu/iova.c" ], "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.89", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.7", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "5.11", "versionEndExcluding": "5.15.89" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.1.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c929a230c84441e400c32e7b7b4ab763711fb63e" }, { "url": "https://git.kernel.org/stable/c/61cbf790e7329ed78877560be7136f0b911bba7f" }, { "url": "https://git.kernel.org/stable/c/dcdb3ba7e2a8caae7bfefd603bc22fd0ce9a389c" } ], "title": "iommu/iova: Fix alloc iova overflows issue", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2023-52910", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:34:52.014408Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:03.507Z" } } ] } }