251 lines
13 KiB
JSON
251 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-40924",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-07-12T12:17:45.582Z",
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"datePublished": "2024-07-12T12:25:04.991Z",
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"dateUpdated": "2026-08-05T11:34:03.107Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:34:03.107Z"
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},
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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/dpt: Make DPT object unshrinkable\n\nIn some scenarios, the DPT object gets shrunk but\nthe actual framebuffer did not and thus its still\nthere on the DPT's vm->bound_list. Then it tries to\nrewrite the PTEs via a stale CPU mapping. This causes panic.\n\n[vsyrjala: Add TODO comment]\n(cherry picked from commit 51064d471c53dcc8eddd2333c3f1c1d9131ba36c)"
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"metrics": [
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{
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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 - Exploitation requires local access to the i915 DRM device node (`/dev/dri/card0`) via the ADDFB2 ioctl plus locally generated memory pressure and a suspend/resume cycle. There is no network-reachable path into `intel_dpt_create()`/`intel_dpt_resume()`.\nAC:L - The attacker controls every input: creating many DPT-backed framebuffers via ADDFB2 exhausts stolen memory to force the shrinkable shmem DPT path, anonymous memory allocation drives kswapd's `I915_SHRINK_ACTIVE` pass that evicts the DPT object, and logind lets an active local session initiate suspend/resume on demand, with unlimited retries.\nPR:L - An unprivileged local user with a graphical session holds an open primary DRM node (ADDFB2 has ioctl flags 0 — neither DRM_MASTER nor CAP_SYS_ADMIN is checked) and can allocate memory and request suspend; no root or capability is needed.\nUI:N - The bound framebuffer vma on the DPT vm's `bound_list` is the normal steady state of any running compositor, and the attacker can drive both the shrink and the suspend/resume itself via logind or the RTC wakealarm. No victim action is required.\nS:U - The dangling write and the resulting corruption are confined to the kernel's own address space and the same i915 device; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Corrupted/stale DPT page-table entries make the display engine fetch arbitrary physical pages for scanout, disclosing kernel and other-process memory, and the use-after-free write into reused vmalloc/ioremap space can be leveraged to expose memory contents.\nI:H - `dpt_insert_entries()` performs many 64-bit `writeq()` operations at an attacker-influenced index with attacker-influenced PTE values through a freed kernel mapping, a use-after-free/out-of-bounds write primitive usable for control-flow corruption once the VA range is reused.\nA:H - The fix commit states plainly that rewriting PTEs via the stale CPU mapping \"causes panic,\" and the related commit reports \"an immediate oops during hibernate,\" i.e. a full kernel crash on the resume path."
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}
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]
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}
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],
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"drivers/gpu/drm/i915/gem/i915_gem_object.h"
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],
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"version": "6.0",
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"version": "0",
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"status": "unaffected",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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{
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"version": "6.9.6",
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"lessThanOrEqual": "6.9.*",
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"status": "unaffected",
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"version": "6.10",
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"versionType": "original_commit_for_fix"
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