CVE-2026-89819

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89819", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.768Z", "datePublished": "2026-09-16T10:30:51.898Z", "dateUpdated": "2026-10-19T08:53:13.333Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:53:13.333Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: validate plane degamma LUT size for private color prop\n\nUnlike the CRTC degamma path, which is guarded by\namdgpu_dm_verify_lut_sizes(), the per-plane degamma LUT size was never\nvalidated before use. __set_dm_plane_degamma() passed the user-supplied\nsize straight into __is_lut_linear() and, for a non-linear LUT, into\n__set_input_tf() -> __drm_lut_to_dc_gamma(), the latter always iterating\nMAX_COLOR_LUT_ENTRIES entries regardless of the actual LUT size.\n\nA malformed AMD_PLANE_DEGAMMA_LUT blob (e.g. a single entry) could thus\ntrigger a divide-by-zero in __is_lut_linear() or an out-of-bounds read in\n__drm_lut_to_dc_gamma(). Reject any plane degamma LUT whose size does not\nmatch MAX_COLOR_LUT_ENTRIES, mirroring the invariant the code already\nasserts a few lines below (and which the CRTC path enforces).\n\nThe AMD_PLANE_DEGAMMA_LUT property is only exposed on builds with\nAMD_PRIVATE_COLOR defined."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only through local DRM ioctls (DRM_IOCTL_MODE_CREATEPROPBLOB then DRM_IOCTL_MODE_ATOMIC or MODE_OBJ_SETPROPERTY) on /dev/dri/cardN when setting AMD_PLANE_DEGAMMA_LUT, a private plane property on AMDGPU display; no network or remote-peer path exists into amdgpu_dm color management.\nAC:L - The attacker fully controls the LUT blob size and contents and can deterministically trigger a divide-by-zero with a one-entry blob or a large heap over-read with a short non-linear LUT; no race, memory-layout luck, or victim state is required.\nPR:L - DRM_IOCTL_MODE_ATOMIC requires DRM master, which is the normal state of the logged-in graphical-session user (compositor, gamescope, kiosk, Steam Deck, Android) or the first opener of an unclaimed card; no CAP_SYS_ADMIN or real root is needed.\nUI:N - The attacker creates the undersized blob and issues the atomic commit from their own process; no other user must open a file, plug in a display, or take any action.\nS:U - The divide-by-zero and out-of-bounds read occur in kernel context on the same host inside the amdgpu display driver; impact stays within the kernel security authority with no VM, IOMMU, or sandbox boundary crossed.\nC:H - __drm_lut_to_dc_gamma() always walks MAX_COLOR_LUT_ENTRIES (4096) drm_color_lut records regardless of blob length, over-reading about 32KB of adjacent kernel heap from a short LUT blob and copying those values into dc_gamma and the display pipeline.\nI:H - Kernel heap contents from the over-read are stored into dc_gamma entries and applied by apply_lut_1d() into the plane transfer function that is programmed into DPP degamma hardware, corrupting driver and GPU color-management state with unvalidated memory.\nA:H - A one-entry LUT causes a divide-error (#DE) panic in __is_lut_linear(); a short non-linear LUT makes __drm_lut_to_dc_gamma() walk tens of kilobytes past the blob into potentially unmapped heap, oopsing the kernel on the atomic check/commit path."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c"], "versions": [{"version": "980f8710075acaeb226a94cde6dda8ffad30123c", "lessThan": "f6f04d8ae5725bcc893bdc62e3467efd97255c5b", "status": "affected", "versionType": "git"}, {"version": "980f8710075acaeb226a94cde6dda8ffad30123c", "lessThan": "0b2615b8b54f58bbdf986dffb38cbc35214a5cc5", "status": "affected", "versionType": "git"}, {"version": "980f8710075acaeb226a94cde6dda8ffad30123c", "lessThan": "b10cc09b329245c6d95f8fa3e7f068575e3e0e9f", "status": "affected", "versionType": "git"}, {"version": "980f8710075acaeb226a94cde6dda8ffad30123c", "lessThan": "e4c3ab59021e7c146a84b6671f0d530972bd58b4", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f6f04d8ae5725bcc893bdc62e3467efd97255c5b"}, {"url": "https://git.kernel.org/stable/c/0b2615b8b54f58bbdf986dffb38cbc35214a5cc5"}, {"url": "https://git.kernel.org/stable/c/b10cc09b329245c6d95f8fa3e7f068575e3e0e9f"}, {"url": "https://git.kernel.org/stable/c/e4c3ab59021e7c146a84b6671f0d530972bd58b4"}], "title": "drm/amd/display: validate plane degamma LUT size for private color prop", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f6f04d8ae5725bcc893bdc62e3467efd97255c5b", "status": "affected", "version": "980f8710075acaeb226a94cde6dda8ffad30123c", "versionType": "git"}, {"lessThan": "0b2615b8b54f58bbdf986dffb38cbc35214a5cc5", "status": "affected", "version": "980f8710075acaeb226a94cde6dda8ffad30123c", "versionType": "git"}, {"lessThan": "b10cc09b329245c6d95f8fa3e7f068575e3e0e9f", "status": "affected", "version": "980f8710075acaeb226a94cde6dda8ffad30123c", "versionType": "git"}, {"lessThan": "e4c3ab59021e7c146a84b6671f0d530972bd58b4", "status": "affected", "version": "980f8710075acaeb226a94cde6dda8ffad30123c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"lessThan": "6.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: validate plane degamma LUT size for private color prop\n\nUnlike the CRTC degamma path, which is guarded by\namdgpu_dm_verify_lut_sizes(), the per-plane degamma LUT size was never\nvalidated before use. __set_dm_plane_degamma() passed the user-supplied\nsize straight into __is_lut_linear() and, for a non-linear LUT, into\n__set_input_tf() -> __drm_lut_to_dc_gamma(), the latter always iterating\nMAX_COLOR_LUT_ENTRIES entries regardless of the actual LUT size.\n\nA malformed AMD_PLANE_DEGAMMA_LUT blob (e.g. a single entry) could thus\ntrigger a divide-by-zero in __is_lut_linear() or an out-of-bounds read in\n__drm_lut_to_dc_gamma(). Reject any plane degamma LUT whose size does not\nmatch MAX_COLOR_LUT_ENTRIES, mirroring the invariant the code already\nasserts a few lines below (and which the CRTC path enforces).\n\nThe AMD_PLANE_DEGAMMA_LUT property is only exposed on builds with\nAMD_PRIVATE_COLOR defined."}], "id": "CVE-2026-89819", "lastModified": "2026-10-19T09:18:25.810", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "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", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T11:16:47.253", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0b2615b8b54f58bbdf986dffb38cbc35214a5cc5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b10cc09b329245c6d95f8fa3e7f068575e3e0e9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e4c3ab59021e7c146a84b6671f0d530972bd58b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f6f04d8ae5725bcc893bdc62e3467efd97255c5b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[980f8710075acaeb226a94cde6dda8ffad30123c,f6f04d8ae5725bcc893bdc62e3467efd97255c5b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[980f8710075acaeb226a94cde6dda8ffad30123c,0b2615b8b54f58bbdf986dffb38cbc35214a5cc5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[980f8710075acaeb226a94cde6dda8ffad30123c,b10cc09b329245c6d95f8fa3e7f068575e3e0e9f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[980f8710075acaeb226a94cde6dda8ffad30123c,e4c3ab59021e7c146a84b6671f0d530972bd58b4)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.51,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.5,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-18T09:15:06.978358+00:00", "updated": "2026-09-20T06:00:13.769709+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-20"]}