CVE-2026-68236 (GCVE-0-2026-68236)
Vulnerability from cvelistv5 – Published: 2026-08-10 12:01 – Updated: 2026-10-03 10:55
VLAI
EPSS
VEX
Title
drm/amd/display: set new_stream to NULL after release
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: set new_stream to NULL after release
In dm_update_crtc_state(), the skip_modeset path releases new_stream
via dc_stream_release() but does not set the pointer to NULL.
If a later error (e.g., color management failure) triggers the fail
label, the error path calls dc_stream_release() again on the same
dangling pointer, causing a double release and potential use-after-free.
Fix this by setting new_stream to NULL after the initial release.
(cherry picked from commit 99f3af19073b3ddbfd96e789124cce12c4277b28)
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
9b690ef3c70422cdcd0cf912db33f2c92ef4a53f , < 92b7c6e3a1546c6db868b07e93fa6fb950d1d3a0
(git)
Affected: 9b690ef3c70422cdcd0cf912db33f2c92ef4a53f , < bf9c06c70f496f1ba4474caf95c69696c828340e (git) Affected: 9b690ef3c70422cdcd0cf912db33f2c92ef4a53f , < 01ba5b36898d6258f584269537cc49e7b05cf7c6 (git) Affected: 9b690ef3c70422cdcd0cf912db33f2c92ef4a53f , < ba8bf1dcbb44773e7a0fd13b42925c644e0d5e76 (git) Affected: 9b690ef3c70422cdcd0cf912db33f2c92ef4a53f , < 5182e442e61397d446c36995b8f5676942d35b82 (git) Affected: 9b690ef3c70422cdcd0cf912db33f2c92ef4a53f , < 679f23f0a3606afcef1ffabd72222f00a54ad9e3 (git) Affected: 9b690ef3c70422cdcd0cf912db33f2c92ef4a53f , < 0676fecbb5242aa22c057e78326d6d6041db034c (git) Affected: 9b690ef3c70422cdcd0cf912db33f2c92ef4a53f , < 9fa26b9eed6195bf840f39ac183b9a6237548755 (git) |
|
| Linux | Linux |
Affected:
4.15
Unaffected: 0 , < 4.15 (semver) Unaffected: 5.10.271 , ≤ 5.10.* (semver) Unaffected: 5.15.222 , ≤ 5.15.* (semver) Unaffected: 6.1.189 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: set new_stream to NULL after release\n\nIn dm_update_crtc_state(), the skip_modeset path releases new_stream\nvia dc_stream_release() but does not set the pointer to NULL.\n\nIf a later error (e.g., color management failure) triggers the fail\nlabel, the error path calls dc_stream_release() again on the same\ndangling pointer, causing a double release and potential use-after-free.\n\nFix this by setting new_stream to NULL after the initial release.\n\n(cherry picked from commit 99f3af19073b3ddbfd96e789124cce12c4277b28)"
}
],
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},
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{
"lang": "en",
"value": "AV:L - The bug is reached through the DRM atomic modeset ioctl (DRM_IOCTL_MODE_ATOMIC) on a local /dev/dri/card* node of an AMD GPU; there is no network or remote input path into dm_update_crtc_state().\nAC:L - A single atomic commit that requests a mode change while attaching a wrong-sized DEGAMMA_LUT blob deterministically drives amdgpu_dm_check_crtc_color_mgmt() to -EINVAL and hits the double dc_stream_release(); no race and no uncontrolled precondition, and TEST_ONLY commits let the attacker repeat it freely to groom the heap.\nPR:L - The atomic ioctl is gated only by DRM master on the card node, which any unprivileged local user on a graphical seat or an unused VT can hold; no CAP_SYS_ADMIN or root is needed.\nUI:N - The attacker performs the whole sequence with its own ioctl calls; no action by another user or administrator is required, and TEST_ONLY commits do not even disturb the display.\nS:U - The corrupted dc_stream_state and the resulting freed-memory reuse stay within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The extra kref_put() frees the dc_stream_state while the CRTC state and the DC context still reference it; reading through those dangling pointers after the slab is reallocated leaks adjacent kernel object contents and pointers, and the attacker can spray to control what lands there.\nI:H - The reference-count underflow yields a use-after-free/double-free: subsequent kref_put() writes into reallocated slab memory and dc_stream_free() kfree()s an attacker-influenced update_scratch pointer, giving write and arbitrary-free primitives usable for privilege escalation.\nA:H - Even without exploitation the premature free causes dereference of freed stream/sink/link structures during atomic state unwind, producing a kernel oops or panic and killing the display pipeline; it can be triggered repeatedly."
}
]
}
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"title": "drm/amd/display: set new_stream to NULL after release",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: set new_stream to NULL after release\n\nIn dm_update_crtc_state(), the skip_modeset path releases new_stream\nvia dc_stream_release() but does not set the pointer to NULL.\n\nIf a later error (e.g., color management failure) triggers the fail\nlabel, the error path calls dc_stream_release() again on the same\ndangling pointer, causing a double release and potential use-after-free.\n\nFix this by setting new_stream to NULL after the initial release.\n\n(cherry picked from commit 99f3af19073b3ddbfd96e789124cce12c4277b28)"
}
],
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"lastModified": "2026-10-03T11:17:36.130",
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"attackVector": "LOCAL",
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"baseScore": 7.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-08-13T23:08:56+00:00",
"cve": "CVE-2026-68236",
"id": "CVE-2026-68236",
"initial_release_date": "2026-08-10T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "28",
"product_status:under_investigation": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: drm/amd/display: set new_stream to NULL after release",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68236.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-03T00:36:30Z",
"cve": "CVE-2026-68236",
"id": "CVE-2026-68236",
"initial_release_date": "2026-08-21T00:44:36Z",
"product_status:known_affected": "671",
"product_status:known_not_affected": "79",
"product_status:recommended": "252",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-68236",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68236.json",
"version": "10"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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 |
|---|
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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