CVE-2026-45956 (GCVE-0-2026-45956)
Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-08-05 12:28
VLAI
EPSS
VEX
Title
drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()
vidi_connection_ioctl() retrieves the driver_data from drm_dev->dev to
obtain a struct vidi_context pointer. However, drm_dev->dev is the
exynos-drm master device, and the driver_data contained therein is not
the vidi component device, but a completely different device.
This can lead to various bugs, ranging from null pointer dereferences and
garbage value accesses to, in unlucky cases, out-of-bounds errors,
use-after-free errors, and more.
To resolve this issue, we need to store/delete the vidi device pointer in
exynos_drm_private->vidi_dev during bind/unbind, and then read this
exynos_drm_private->vidi_dev within ioctl() to obtain the correct
struct vidi_context pointer.
Severity
7.8 (High)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
cf67cc9a29ac19c98bc4fa0e6d14b0c1f592d322 , < 2987642c5213508c6c9e718324c0d5289a92c474
(git)
Affected: cf67cc9a29ac19c98bc4fa0e6d14b0c1f592d322 , < 65d1213baffa363f2eb1117b1dc7acc573b890f8 (git) Affected: cf67cc9a29ac19c98bc4fa0e6d14b0c1f592d322 , < 875fa28690e93ed5296c31d3344556c6bb867234 (git) Affected: cf67cc9a29ac19c98bc4fa0e6d14b0c1f592d322 , < 21ca24ba51a2c28bcc4df9d7e5a40b0eb66ab76d (git) Affected: cf67cc9a29ac19c98bc4fa0e6d14b0c1f592d322 , < b5fc86d753dd4c281a943b92f0eef02d31af03d7 (git) Affected: cf67cc9a29ac19c98bc4fa0e6d14b0c1f592d322 , < a540f767642f75240a6c35f6a65b69e44cfcea9d (git) Affected: cf67cc9a29ac19c98bc4fa0e6d14b0c1f592d322 , < d3968a0d85b211e197f2f4f06268a7031079e0d0 (git) |
guessed | |
| Linux | Linux |
Affected:
4.3
Unaffected: 0 , < 4.3 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
{
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"drivers/gpu/drm/exynos/exynos_drm_drv.h",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/exynos: vidi: use priv-\u003evidi_dev for ctx lookup in vidi_connection_ioctl()\n\nvidi_connection_ioctl() retrieves the driver_data from drm_dev-\u003edev to\nobtain a struct vidi_context pointer. However, drm_dev-\u003edev is the\nexynos-drm master device, and the driver_data contained therein is not\nthe vidi component device, but a completely different device.\n\nThis can lead to various bugs, ranging from null pointer dereferences and\ngarbage value accesses to, in unlucky cases, out-of-bounds errors,\nuse-after-free errors, and more.\n\nTo resolve this issue, we need to store/delete the vidi device pointer in\nexynos_drm_private-\u003evidi_dev during bind/unbind, and then read this\nexynos_drm_private-\u003evidi_dev within ioctl() to obtain the correct\nstruct vidi_context pointer."
}
],
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},
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{
"lang": "en",
"value": "AV:L - The flaw is reached only through the Exynos DRM primary device node via DRM_IOCTL_EXYNOS_VIDI_CONNECTION (local ioctl path through drm_ioctl), not over the network.\nAC:L - Once the VIDI driver is enabled and the caller passes DRM_AUTH checks, every call uses the wrong context pointer deterministically; the attacker fully controls ioctl arguments and timing without external race luck.\nPR:L - Exploitation requires a local process that can open the primary DRM device and satisfy DRM_AUTH (authenticated DRM client or CAP_SYS_ADMIN, which includes user-namespace admin); it does not require init-namespace root, but unauthenticated users cannot reach the ioctl.\nUI:N - No victim interaction is required beyond the attacker (or their already-authenticated DRM client) issuing the malicious ioctl.\nS:U - Impact is kernel memory corruption and instability within the same kernel security domain; it is not a VM escape, IOMMU bypass, or cross-authority sandbox break.\nC:H - Type-confused reads/writes against a drm_device masquerading as vidi_context can dereference attacker-influenced garbage pointers and, on affected versions in the CVE window, companion paths also allowed unsafe EDID handling; per project guidance, UAF/wrong-free and uncontrolled reads warrant High confidentiality impact.\nI:H - The ioctl writes connection state and EDID pointers into misaligned drm_device fields and may call drm_edid_free() on attacker-influenced addresses, enabling arbitrary kernel memory corruption and potential control-flow hijack, not merely a benign crash.\nA:H - The fix and commit message document NULL dereferences, out-of-bounds access, and use-after-free outcomes that can oops or panic the kernel; any such crash maps to High availability impact."
}
]
}
],
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{
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{
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"cveId": "CVE-2026-45956",
"datePublished": "2026-05-27T12:18:11.972Z",
"dateReserved": "2026-05-13T15:03:33.088Z",
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"source": "Microsoft CSAF VEX",
"status": "final",
"title": "drm/exynos: vidi: use priv-\u003evidi_dev for ctx lookup in vidi_connection_ioctl()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-45956.json",
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},
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However, drm_dev-\u003edev is the\\nexynos-drm master device, and the driver_data contained therein is not\\nthe vidi component device, but a completely different device.\\n\\nThis can lead to various bugs, ranging from null pointer dereferences and\\ngarbage value accesses to, in unlucky cases, out-of-bounds errors,\\nuse-after-free errors, and more.\\n\\nTo resolve this issue, we need to store/delete the vidi device pointer in\\nexynos_drm_private-\u003evidi_dev during bind/unbind, and then read this\\nexynos_drm_private-\u003evidi_dev within ioctl() to obtain the correct\\nstruct vidi_context 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"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-28T11:18:14+00:00",
"cve": "CVE-2026-45956",
"id": "CVE-2026-45956",
"initial_release_date": "2026-05-27T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: drm/exynos: vidi: use priv-\u003evidi_dev for ctx lookup in vidi_connection_ioctl()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45956.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:13:58Z",
"cve": "CVE-2026-45956",
"id": "CVE-2026-45956",
"initial_release_date": "2026-05-28T03:55:29Z",
"product_status:known_affected": "383",
"product_status:known_not_affected": "4",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-45956",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45956.json",
"version": "7"
}
}
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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