{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89452", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.706Z", "datePublished": "2026-09-11T19:43:17.405Z", "dateUpdated": "2026-10-21T12:47:30.756Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:47:30.756Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/msm: Unwind probe state on registration failure\n\nmsm_iommu_probe() adds its devm-managed IOMMU object to\nqcom_iommu_devices before adding the IOMMU sysfs device and registering\nit with the IOMMU core.\n\nIf iommu_device_sysfs_add() fails, probe returns with the object still on\nqcom_iommu_devices. The driver core then releases the devm allocation,\nleaving a dangling list entry that later list walks may dereference.\n\nIf iommu_device_register() fails, the same dangling list entry remains\nand the sysfs device is left registered as well.\n\nUnwind the sysfs device and global list entry in reverse setup order on\nthe corresponding failure paths." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is in msm_iommu_probe() for the Qualcomm APQ8064 platform IOMMU (compatible qcom,apq8064-iommu). It is reached only through the local platform driver core at boot or sysfs bind, not via network protocols, Bluetooth/WiFi, or a physical USB/serial endpoint.\nAC:L - After list_add, a failed iommu_device_sysfs_add() or iommu_device_register() deterministically leaves a freed msm_iommu_dev on qcom_iommu_devices. APQ8064 has four IOMMU instances, so a later probe, of_xlate, or attach walks that list and dereferences the object with no attacker-uncontrolled race. GFP_ATOMIC allocation in insert_iommu_master during register can induce the failure.\nPR:N - msm_iommu_probe() and later list walks in qcom_iommu_of_xlate(), find_iommu_for_dev(), and msm_iommu_attach_dev() run from the platform/IOMMU core with no capable() or credential check. On APQ8064 phones and embedded boards this happens automatically during boot or deferred probe without a user account.\nUI:N - Platform probe and subsequent IOMMU client attach/xlate run unattended during normal kernel device bring-up. No victim action such as mounting a filesystem, opening a file, or clicking a prompt is required.\nS:U - The use-after-free corrupts host kernel heap through the driver's private qcom_iommu_devices list, enabling in-kernel privilege escalation. It does not by itself escape a VM or bypass the IOMMU/DMA isolation boundary as a distinct security authority.\nC:H - The dangling msm_iommu_dev stays linked after devm frees it. Subsequent list walks dereference attacker-influencable freed heap (including embedded list pointers and device state), which per kernel UAF guidance enables arbitrary kernel memory disclosure.\nI:H - Use-after-free of the IOMMU instance structure (list nodes, MMIO base, context-bank maps) allows heap spraying and hijack of later attach/xlate control flow, providing an arbitrary kernel write and code-execution primitive.\nA:H - Any later walk of qcom_iommu_devices after the failed probe dereferences freed memory and can oops or panic the kernel. Kernel UAFs also crash even when not turned into a full exploit." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iommu/msm_iommu.c" ], "versions": [ { "version": "42df43b36163ed7d0ab13992e411093252903273", "lessThan": "6a1ae472113762f794682229a0f233f1ee0f69a4", "status": "affected", "versionType": "git" }, { "version": "42df43b36163ed7d0ab13992e411093252903273", "lessThan": "51e37f9179387b6e3fa64a3d3b4fece1a38b3a02", "status": "affected", "versionType": "git" }, { "version": "42df43b36163ed7d0ab13992e411093252903273", "lessThan": "f532401be9312ecd166f616bb74a65b0b4c150fa", "status": "affected", "versionType": "git" }, { "version": "42df43b36163ed7d0ab13992e411093252903273", "lessThan": "7f7074a886c4a93e3d12076ce60a510a1ebe400c", "status": "affected", "versionType": "git" }, { "version": "42df43b36163ed7d0ab13992e411093252903273", "lessThan": "535a200220ca2c83bc8bf54bd2cbe045d6ee70c4", "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/msm_iommu.c" ], "versions": [ { "version": "4.11", "status": "affected" }, { "version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "4.11", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6a1ae472113762f794682229a0f233f1ee0f69a4" }, { "url": "https://git.kernel.org/stable/c/51e37f9179387b6e3fa64a3d3b4fece1a38b3a02" }, { "url": "https://git.kernel.org/stable/c/f532401be9312ecd166f616bb74a65b0b4c150fa" }, { "url": "https://git.kernel.org/stable/c/7f7074a886c4a93e3d12076ce60a510a1ebe400c" }, { "url": "https://git.kernel.org/stable/c/535a200220ca2c83bc8bf54bd2cbe045d6ee70c4" } ], "title": "iommu/msm: Unwind probe state on registration failure", "x_generator": { "engine": "bippy-1.2.0" } } } }