CVE-2022-48979 (GCVE-0-2022-48979)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:05 – Updated: 2026-08-12 23:57
VLAI
Title
drm/amd/display: fix array index out of bound error in DCN32 DML
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix array index out of bound error in DCN32 DML [Why&How] LinkCapacitySupport array is indexed with the number of voltage states and not the number of max DPPs. Fix the error by changing the array declaration to use the correct (larger) array size of total number of voltage states.
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 2024-10-22 13:18 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 74458c081fcfb0423877e630de2746daefdb16e4 , < 3d8a298b2e83b98042e6ec726e934f535b23e6aa (git)
Affected: 74458c081fcfb0423877e630de2746daefdb16e4 , < aeffc8fb2174f017a10df114bc312f899904dc68 (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 6.0.13 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-48979\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:18:06.288121Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:18:09.448Z\"}}], \"cna\": {\"title\": \"drm/amd/display: fix array index out of bound error in DCN32 DML\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The bug is reached via DRM atomic modesetting (DRM_IOCTL_MODE_ATOMIC) into amdgpu_dm validation and DCN32 DML (dml32_ModeSupportAndSystemConfigurationFull); exploitation requires local access to the DRM device, not network or adjacent-network reachability.\\nAC:L - On affected DCN32 hardware, synthetic/legacy SOC state construction routinely builds more than DC__NUM_DPP__MAX (8) voltage states (up to DC__VOLTAGE_STATES=20), so mode validation reliably indexes past the undersized LinkCapacitySupport array with no race or attacker-uncontrollable condition.\\nPR:L - Triggering requires DRM master for atomic modeset, which an unprivileged local user with seat/video access can obtain (first opener of the primary node becomes master without CAP_SYS_ADMIN; compositors also run as the logged-in user), matching other amd/display OOB scores.\\nUI:N - The attacker initiates the modeset/ioctl themselves; no separate victim action is required.\\nS:U - Impact is confined to kernel memory within the same host security authority (standard local kernel memory corruption / privilege-escalation scope), with no VM escape or IOMMU boundary crossing.\\nC:H - Out-of-bounds indexing of LinkCapacitySupport both writes past the array into adjacent vba_vars_st fields and reads those adjacent bytes as mode-support flags; kernel memory corruption of this class is treated as enabling high confidentiality impact.\\nI:H - The bug is an out-of-bounds write of bool values into neighboring DML state (VREADY_AT_OR_AFTER_VSYNC, MIN_DST_Y_NEXT_START, and beyond), which is kernel memory corruption usable for integrity impact and control-flow/state corruption.\\nA:H - Corrupting adjacent mode-programming state can cause kernel oops/panic or otherwise fatal misbehavior during display bandwidth validation and subsequent programming.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"74458c081fcfb0423877e630de2746daefdb16e4\", \"lessThan\": \"3d8a298b2e83b98042e6ec726e934f535b23e6aa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"74458c081fcfb0423877e630de2746daefdb16e4\", \"lessThan\": \"aeffc8fb2174f017a10df114bc312f899904dc68\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.0.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3d8a298b2e83b98042e6ec726e934f535b23e6aa\"}, {\"url\": \"https://git.kernel.org/stable/c/aeffc8fb2174f017a10df114bc312f899904dc68\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/amd/display: fix array index out of bound error in DCN32 DML\\n\\n[Why\u0026How]\\nLinkCapacitySupport array is indexed with the number of voltage states and\\nnot the number of max DPPs. Fix the error by changing the array\\ndeclaration to use the correct (larger) array size of total number of\\nvoltage states.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.13\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"5.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-12T23:57:22.747Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48979\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-12T23:57:22.747Z\", \"dateReserved\": \"2024-08-22T01:27:53.632Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T20:05:57.707Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.