Vulnerability-Lookup

GHSA-FMCQ-989J-68J8

Vulnerability from github – Published: 2024-07-12 15:31 – Updated: 2025-11-04 00:30

Details

In the Linux kernel, the following vulnerability has been resolved:

drm/i915/dpt: Make DPT object unshrinkable

In some scenarios, the DPT object gets shrunk but the actual framebuffer did not and thus its still there on the DPT's vm->bound_list. Then it tries to rewrite the PTEs via a stale CPU mapping. This causes panic.

[vsyrjala: Add TODO comment] (cherry picked from commit 51064d471c53dcc8eddd2333c3f1c1d9131ba36c)

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2024-40924"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-12T13:15:15Z",
    "severity": "MODERATE"
  },
  "details": "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\u0027s vm-\u003ebound_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)",
  "id": "GHSA-fmcq-989j-68j8",
  "modified": "2025-11-04T00:30:53Z",
  "published": "2024-07-12T15:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-40924"
    },
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/327280149066f0e5f2e50356b5823f76dabfe86e"
    },
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      "url": "https://git.kernel.org/stable/c/43e2b37e2ab660c3565d4cff27922bc70e79c3f1"
    },
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      "url": "https://git.kernel.org/stable/c/7a9883be3b98673333eec65c4a21cc18e60292eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2552020fb714ff357182c3c179abfac2289f84d"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-40924 (GCVE-0-2024-40924)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:25 – Updated: 2026-08-05 11:34

Title

drm/i915/dpt: Make DPT object unshrinkable

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/i915/dpt: Make DPT object unshrinkable In some scenarios, the DPT object gets shrunk but the actual framebuffer did not and thus its still there on the DPT's vm->bound_list. Then it tries to rewrite the PTEs via a stale CPU mapping. This causes panic. [vsyrjala: Add TODO comment] (cherry picked from commit 51064d471c53dcc8eddd2333c3f1c1d9131ba36c)

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 17:05 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/327280149066f0e5f…
https://git.kernel.org/stable/c/7a9883be3b9867333…
https://git.kernel.org/stable/c/a2552020fb714ff35…
https://git.kernel.org/stable/c/43e2b37e2ab660c35…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0dc987b699ce4266450d407d6d79d41eab88c5d0 , < 327280149066f0e5f2e50356b5823f76dabfe86e (git) Affected: 0dc987b699ce4266450d407d6d79d41eab88c5d0 , < 7a9883be3b98673333eec65c4a21cc18e60292eb (git) Affected: 0dc987b699ce4266450d407d6d79d41eab88c5d0 , < a2552020fb714ff357182c3c179abfac2289f84d (git) Affected: 0dc987b699ce4266450d407d6d79d41eab88c5d0 , < 43e2b37e2ab660c3565d4cff27922bc70e79c3f1 (git)
Linux	Linux	Affected: 6.0 Unaffected: 0 , < 6.0 (semver) Unaffected: 6.1.95 , ≤ 6.1.* (semver) Unaffected: 6.6.35 , ≤ 6.6.* (semver) Unaffected: 6.9.6 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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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\u0027s `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 \u2014 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\u0027s `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\u0027s 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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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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