{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89808", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.767Z", "datePublished": "2026-09-16T10:30:41.508Z", "dateUpdated": "2026-10-21T12:48:49.191Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:48:49.191Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram\n\nWhen migration vm range is hole at cpu side(MIGRATE_PFN_MIGRATE set +\nMIGRATE_PFN_VALID unset) driver still allocates device pages. There is no\ndma map of src pages and migration. j is 0 and svm_migrate_copy_memory_gart()\nwill return an uninitialized r. That can trigger out_free_vram_pages to drop\nall VRAM just set up.\n\nInitialize r and only call the last svm_migrate_copy_memory_gart if j > 0.\n\nCurrent code postponed the last page to the final copy. This patch flushes on\nthe last page when reach to the end of current drm_buddy_block; avoids another\nsvm_migrate_copy_memory_gart." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached only via local /dev/kfd AMDKFD_IOC_SVM (SET_ATTR prefetch) or the process's own GPU page-fault SVM restore into svm_migrate_copy_to_vram; it is not reachable from network packets, adjacent wireless, or a physical bus.\nAC:L - An attacker creates anonymous VMA holes (untouched mmap or zero pages) and triggers migration with AMDKFD_IOC_SVM PREFETCH_LOC; migrate_vma records MIGRATE_PFN_MIGRATE without VALID so j stays 0 and the uninitialized-r path runs with no race, victim state, or rare config (HSA_AMD_SVM defaults y).\nPR:L - kfd_open() and AMDKFD_IOC_SVM perform no capable() checks (ioctl flag 0, unlike CRIU); /dev/kfd and the DRM render node are available to unprivileged render-group users on typical ROCm, desktop, and Android AMD GPU systems, which is Low privilege not init-namespace root.\nUI:N - Exploitation uses only the attacker's own /dev/kfd file descriptor, anonymous mappings, and SVM ioctls; no separate victim must mount a filesystem, open a file, or take any other action.\nS:U - Impact is confined to amdkfd SVM/GPUVM state and ZONE_DEVICE pages in the host kernel; it does not cross a VM, hypervisor, IOMMU device-isolation, or sandbox security authority.\nC:H - Spurious out_free_vram_pages unlocks and puts destination ZONE_DEVICE pages (page_free → svm_range_bo_unref_async) while SDMA may still copy into that VRAM and a non-zero leftover r can still mark the range GPU-resident; that device-page UAF enables kernel/VRAM disclosure.\nI:H - The same premature free of migrate destination pages, while actual_loc/vram_pages may still record a successful GPU migration, lets later HMM/GPUVM/SDMA operate on put ZONE_DEVICE pages and svm_bo refs, a kernel UAF write/control-flow primitive scored High per UAF guidance.\nA:H - Putting still-in-use ZONE_DEVICE pages and leaving SVM actual_loc/vram_pages inconsistent reliably causes kernel oops/WARN (bad page lock, folio_put on freed pages, VRAM BO validation) or GPU hang/reset, which is High availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/amd/amdkfd/kfd_migrate.c" ], "versions": [ { "version": "50ea50cf6f6d31d3235ad1853c5dbea766a3ed11", "lessThan": "6e1a6f3ddb87d7f89a775c55fb399680c02bdcc2", "status": "affected", "versionType": "git" }, { "version": "50ea50cf6f6d31d3235ad1853c5dbea766a3ed11", "lessThan": "bd1adb2e5101db649121b59e601c92773a302a70", "status": "affected", "versionType": "git" }, { "version": "50ea50cf6f6d31d3235ad1853c5dbea766a3ed11", "lessThan": "ae806a95b28fcecb913430cfa45a252e91a945d6", "status": "affected", "versionType": "git" }, { "version": "50ea50cf6f6d31d3235ad1853c5dbea766a3ed11", "lessThan": "0a9a0e8a97da70a0336c9115178aaf1be29bcfb1", "status": "affected", "versionType": "git" }, { "version": "50ea50cf6f6d31d3235ad1853c5dbea766a3ed11", "lessThan": "520e345ffe05aabef1db82beda4288afb1757ff2", "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/gpu/drm/amd/amdkfd/kfd_migrate.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "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": "5.14", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.12.114" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6e1a6f3ddb87d7f89a775c55fb399680c02bdcc2" }, { "url": "https://git.kernel.org/stable/c/bd1adb2e5101db649121b59e601c92773a302a70" }, { "url": "https://git.kernel.org/stable/c/ae806a95b28fcecb913430cfa45a252e91a945d6" }, { "url": "https://git.kernel.org/stable/c/0a9a0e8a97da70a0336c9115178aaf1be29bcfb1" }, { "url": "https://git.kernel.org/stable/c/520e345ffe05aabef1db82beda4288afb1757ff2" } ], "title": "drm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram", "x_generator": { "engine": "bippy-1.2.0" } } } }