{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68260", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.378Z", "datePublished": "2026-08-10T12:01:34.414Z", "dateUpdated": "2026-08-17T05:01:52.352Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:01:52.352Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/imagination: acquire vm_ctx->lock before mapping memory to GPU VM\n\nThe drm gpuvm code doesn't protect find operation against map operation,\nand the driver needs to ensure a map operation shouldn't happen when a\nfind operation is in progress.\n\nIn some cases a find operation will be in progress when doing map/unmap\noperations, and the find operation will do a NULL pointer dereference.\n\nAn example of the stack trace of such NULL dereference is shown below:\n\n```\nUnable to handle kernel access to user memory without uaccess routines at\nvirtual address 0000000000000010\n\n[] drm_gpuva_find+0x28/0x6c [drm_gpuvm]\n[] pvr_vm_unmap+0x34/0x68 [powervr]\n[] pvr_ioctl_vm_unmap+0x2e/0x50 [powervr]\n[] drm_ioctl_kernel+0x8e/0xdc\n[] drm_ioctl+0x1be/0x3e0\n[] __riscv_sys_ioctl+0xba/0xc4\n[] do_trap_ecall_u+0x23e/0x3f4\n[] handle_exception+0x168/0x174\n```\n\nAs all occurences of drm_gpuva_find*() are already guarded by\nvm_ctx->lock, make pvr_vm_map() to acquire this lock to prevent\ndisturbing any find operation. This fixes the NULL deference problem in\ndrm_gpuva_find*()." } ], "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 - Triggered through the DRM_IOCTL_PVR_VM_MAP/VM_UNMAP ioctls on the PowerVR render node (/dev/dri/renderD*), which requires local access to the device file; no network or physical path exists.\nAC:L - The attacker owns both sides of the race, issuing concurrent VM_MAP and VM_UNMAP ioctls from two threads on the same fd and vm_ctx handle, and can retry indefinitely with attacker-chosen mapping layouts that force split/remap (free) paths.\nPR:L - The ioctls are marked DRM_RENDER_ALLOW, so no DRM master, root, or capability is needed; any unprivileged process able to open the render node (world-accessible or graphics-group on Android/embedded PowerVR devices) can reach the code.\nUI:N - The attacker performs the entire sequence itself by opening the render node, creating a VM context and issuing concurrent map/unmap ioctls; no victim action is involved.\nS:U - The corruption stays within the kernel's own security authority on the affected host; no VM, IOMMU or sandbox boundary is crossed by the flaw itself.\nC:H - The unlocked map path frees drm_gpuva objects via pvr_vm_gpuva_remap()/pvr_vm_gpuva_unmap() while a concurrent find returns them, yielding a use-after-free whose reclaimed contents the attacker can groom to read kernel memory; racing MMU updates can also leave GPU page tables mapping unintended pages.\nI:H - The same use-after-free plus unsynchronized rb interval-tree insert/remove gives attacker-influenced writes through a freed/corrupted structure, and the racing pvr_mmu_map/unmap operations can corrupt GPU page tables, which is leveragable into arbitrary memory modification.\nA:H - The reported failure is an immediate kernel NULL pointer dereference in drm_gpuva_find(), and tree corruption or use-after-free reliably produces oopses, and the ioctl can be re-issued to crash the system at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/imagination/pvr_vm.c" ], "versions": [ { "version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11", "lessThan": "1f1f2618e44b21a7d4eb30d3bbd7e015ffbbbadf", "status": "affected", "versionType": "git" }, { "version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11", "lessThan": "6253bb56bb2ebdf317d8b599ce737a2510cc2e17", "status": "affected", "versionType": "git" }, { "version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11", "lessThan": "15f58d44c24477a6ebffa44ec05207b81cfa55d9", "status": "affected", "versionType": "git" }, { "version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11", "lessThan": "17e2030f37600994440f875dc410615d5c66ee6d", "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/imagination/pvr_vm.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.8", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1f1f2618e44b21a7d4eb30d3bbd7e015ffbbbadf" }, { "url": "https://git.kernel.org/stable/c/6253bb56bb2ebdf317d8b599ce737a2510cc2e17" }, { "url": "https://git.kernel.org/stable/c/15f58d44c24477a6ebffa44ec05207b81cfa55d9" }, { "url": "https://git.kernel.org/stable/c/17e2030f37600994440f875dc410615d5c66ee6d" } ], "title": "drm/imagination: acquire vm_ctx->lock before mapping memory to GPU VM", "x_generator": { "engine": "bippy-1.2.0" } } } }