305 lines
18 KiB
JSON
305 lines
18 KiB
JSON
{
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"cveId": "CVE-2024-41092",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-07-12T12:17:45.636Z",
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"datePublished": "2024-07-29T15:48:05.853Z",
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"dateUpdated": "2026-08-05T11:35:20.738Z"
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/gt: Fix potential UAF by revoke of fence registers\n\nCI has been sporadically reporting the following issue triggered by\nigt@i915_selftest@live@hangcheck on ADL-P and similar machines:\n\n<6> [414.049203] i915: Running intel_hangcheck_live_selftests/igt_reset_evict_fence\n...\n<6> [414.068804] i915 0000:00:02.0: [drm] GT0: GUC: submission enabled\n<6> [414.068812] i915 0000:00:02.0: [drm] GT0: GUC: SLPC enabled\n<3> [414.070354] Unable to pin Y-tiled fence; err:-4\n<3> [414.071282] i915_vma_revoke_fence:301 GEM_BUG_ON(!i915_active_is_idle(&fence->active))\n...\n<4>[ 609.603992] ------------[ cut here ]------------\n<2>[ 609.603995] kernel BUG at drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c:301!\n<4>[ 609.604003] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\n<4>[ 609.604006] CPU: 0 PID: 268 Comm: kworker/u64:3 Tainted: G U W 6.9.0-CI_DRM_14785-g1ba62f8cea9c+ #1\n<4>[ 609.604008] Hardware name: Intel Corporation Alder Lake Client Platform/AlderLake-P DDR4 RVP, BIOS RPLPFWI1.R00.4035.A00.2301200723 01/20/2023\n<4>[ 609.604010] Workqueue: i915 __i915_gem_free_work [i915]\n<4>[ 609.604149] RIP: 0010:i915_vma_revoke_fence+0x187/0x1f0 [i915]\n...\n<4>[ 609.604271] Call Trace:\n<4>[ 609.604273] <TASK>\n...\n<4>[ 609.604716] __i915_vma_evict+0x2e9/0x550 [i915]\n<4>[ 609.604852] __i915_vma_unbind+0x7c/0x160 [i915]\n<4>[ 609.604977] force_unbind+0x24/0xa0 [i915]\n<4>[ 609.605098] i915_vma_destroy+0x2f/0xa0 [i915]\n<4>[ 609.605210] __i915_gem_object_pages_fini+0x51/0x2f0 [i915]\n<4>[ 609.605330] __i915_gem_free_objects.isra.0+0x6a/0xc0 [i915]\n<4>[ 609.605440] process_scheduled_works+0x351/0x690\n...\n\nIn the past, there were similar failures reported by CI from other IGT\ntests, observed on other platforms.\n\nBefore commit 63baf4f3d587 (\"drm/i915/gt: Only wait for GPU activity\nbefore unbinding a GGTT fence\"), i915_vma_revoke_fence() was waiting for\nidleness of vma->active via fence_update(). That commit introduced\nvma->fence->active in order for the fence_update() to be able to wait\nselectively on that one instead of vma->active since only idleness of\nfence registers was needed. But then, another commit 0d86ee35097a\n(\"drm/i915/gt: Make fence revocation unequivocal\") replaced the call to\nfence_update() in i915_vma_revoke_fence() with only fence_write(), and\nalso added that GEM_BUG_ON(!i915_active_is_idle(&fence->active)) in front.\nNo justification was provided on why we might then expect idleness of\nvma->fence->active without first waiting on it.\n\nThe issue can be potentially caused by a race among revocation of fence\nregisters on one side and sequential execution of signal callbacks invoked\non completion of a request that was using them on the other, still\nprocessed in parallel to revocation of those fence registers. Fix it by\nwaiting for idleness of vma->fence->active in i915_vma_revoke_fence().\n\n(cherry picked from commit 24bb052d3dd499c5956abad5f7d8e4fd07da7fb1)"
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"metrics": [
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{
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable path is reached only through local DRM ioctls on /dev/dri/cardN or renderD128 (I915_GEM_EXECBUFFER2 with EXEC_OBJECT_NEEDS_FENCE, I915_GEM_SET_TILING, I915_GEM_MMAP_OFFSET). There is no remote or adjacent-network component to i915 GGTT fence management.\nAC:L - The attacker controls both sides of the race — one thread continuously submits fenced batches that populate fence->active while another forces revocation via GEM handle close or re-tiling, and with only 8-32 fence registers available GGTT/fence eviction pressure is trivially induced and looped indefinitely until the window is hit.\nPR:L - All required ioctls are DRM_RENDER_ALLOW and need no capability; any user with render-node access — every logged-in desktop/Chromebook user, container workloads, and sandboxed browser GPU processes — can reach the code. No root or CAP_SYS_ADMIN is involved.\nUI:N - The attacker performs every step itself via its own ioctl sequence and GPU submissions; no victim action, file open, or mount is required.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed (even under GVT-g the effect stays within the guest kernel).\nC:H - The use-after-free on the freed i915_vma/GEM object, in a slab the attacker grooms freely by cycling GEM allocations, yields an arbitrary kernel read primitive; additionally the stale fence register can be re-programmed for another object, exposing a different context's tiled buffer contents through the detiler window.\nI:H - Use-after-free of a freed vma written by in-flight retire callbacks gives a heap-spray-backed write primitive suitable for control-flow hijacking, and the un-drained fence register can be reprogrammed to apply wrong start/size/stride/tiling to an unrelated buffer, corrupting its contents.\nA:H - On CONFIG_DRM_I915_DEBUG_GEM kernels this is an immediate kernel BUG()/panic at intel_ggtt_fencing.c:301 as seen in the reported traces, and on production kernels the silent UAF causes oopses and GPU/memory corruption; either way it is a full system crash reproducible on demand."
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