{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43280", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.998Z", "datePublished": "2026-05-06T11:29:01.562Z", "dateUpdated": "2026-08-05T12:27:02.301Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:27:02.301Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: Add bounds check on pat_index to prevent OOB kernel read in madvise\n\nWhen user provides a bogus pat_index value through the madvise IOCTL, the\nxe_pat_index_get_coh_mode() function performs an array access without\nvalidating bounds. This allows a malicious user to trigger an out-of-bounds\nkernel read from the xe->pat.table array.\n\nThe vulnerability exists because the validation in madvise_args_are_sane()\ndirectly calls xe_pat_index_get_coh_mode(xe, args->pat_index.val) without\nfirst checking if pat_index is within [0, xe->pat.n_entries).\n\nAlthough xe_pat_index_get_coh_mode() has a WARN_ON to catch this in debug\nbuilds, it still performs the unsafe array access in production kernels.\n\nv2(Matthew Auld)\n- Using array_index_nospec() to mitigate spectre attacks when the value\nis used\n\nv3(Matthew Auld)\n- Put the declarations at the start of the block\n\n(cherry picked from commit 944a3329b05510d55c69c2ef455136e2fc02de29)" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is a local DRM xe ioctl, reached by opening an xe DRM render device and issuing DRM_IOCTL_XE_VM_CREATE followed by DRM_IOCTL_XE_MADVISE. It is not reachable from network, adjacent, or physical input.\nAC:L - Exploitation requires only attacker-controlled ioctl arguments with type DRM_XE_MEM_RANGE_ATTR_PAT and an out-of-range pat_index; no race or hard-to-control state is required. A valid VM id can be created by the same unprivileged caller.\nPR:L - The ioctl is registered with DRM_RENDER_ALLOW and no DRM_AUTH, DRM_MASTER, or DRM_ROOT_ONLY gate, so a normal local user with access to the render node can reach it. It does not require real root or capabilities.\nUI:N - No victim action is needed after the attacker has local execution and device-node access. The attacker directly opens the DRM node and submits the ioctl.\nS:U - The bug is in the host kernel DRM driver and impacts kernel resources under the same security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The flaw is an attacker-controlled out-of-bounds kernel read from xe->pat.table via xe_pat_index_get_coh_mode(), with a u16 index range and no bounds check before the fix. Following the higher-severity rule for OOB kernel reads, this is scored as high confidentiality impact.\nI:N - The immediate primitive is an out-of-bounds read and validation oracle; the investigated path does not provide a direct kernel write or memory corruption primitive. A bad PAT value may be stored only if the OOB read happens to pass validation, but that does not establish arbitrary modification of protected data.\nA:H - Out-of-range pat_index values trigger WARN_ON in xe_pat_index_get_coh_mode(), and in hardened or panic_on_warn deployments this can panic the kernel. The same local user can repeatedly trigger the condition, so high availability impact is the higher defensible choice." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/xe/xe_vm_madvise.c" ], "versions": [ { "version": "ada7486c5668db542a7d361268df931aca5b726a", "lessThan": "ffba51100ff61792fefbae11ca38ac1987a818dd", "status": "affected", "versionType": "git" }, { "version": "ada7486c5668db542a7d361268df931aca5b726a", "lessThan": "79f52655567a6471ff3d0d6325ede91bb14461f4", "status": "affected", "versionType": "git" }, { "version": "ada7486c5668db542a7d361268df931aca5b726a", "lessThan": "fbbe32618e97eff81577a01eb7d9adcd64a216d7", "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/xe/xe_vm_madvise.c" ], "versions": [ { "version": "6.18", "status": "affected" }, { "version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "6.18", "versionEndExcluding": "6.18.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ffba51100ff61792fefbae11ca38ac1987a818dd" }, { "url": "https://git.kernel.org/stable/c/79f52655567a6471ff3d0d6325ede91bb14461f4" }, { "url": "https://git.kernel.org/stable/c/fbbe32618e97eff81577a01eb7d9adcd64a216d7" } ], "title": "drm/xe: Add bounds check on pat_index to prevent OOB kernel read in madvise", "x_generator": { "engine": "bippy-1.2.0" } } } }