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CVE-2026-46209 (GCVE-0-2026-46209)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:40 – Updated: 2026-08-05 12:30
VLAI
Title
drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs() drm_gem_fb_init_with_funcs() computes sub-sampled plane dimensions using plain integer division: unsigned int width = mode_cmd->width / (i ? info->hsub : 1); unsigned int height = mode_cmd->height / (i ? info->vsub : 1); However, the ioctl-level framebuffer_check() in drm_framebuffer.c uses drm_format_info_plane_width/height() which round up dimensions via DIV_ROUND_UP(). This inconsistency corrupts the subsequent GEM object size check for certain pixel format and dimension combinations. For example, with NV12 (vsub=2) and a 1-pixel-tall framebuffer the GEM size validation path sees height=0 instead of height=1. The expression (height - 1) then wraps to UINT_MAX as an unsigned int, causing min_size to overflow and wrap back to a small value. A tiny GEM object therefore passes the size guard, yet when the GPU accesses the chroma plane it will read or write memory beyond the object's bounds. Fix by replacing the open-coded divisions with drm_format_info_plane_width() and drm_format_info_plane_height(), which use DIV_ROUND_UP() and match the calculation already used in framebuffer_check().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 , < 11427ad6c9f0def5ce567982b785da3191946430 (git)
Affected: 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 , < adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad (git)
Affected: 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 , < 22922f7dae74409fc4bf0f1142710cb6b8ce8cc2 (git)
Affected: 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 , < 6b992591e04f2cce813bcf239b354f375bbf84d3 (git)
Affected: 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 , < 1da4ab7189f1064b3b712b388772c008b4d82580 (git)
Affected: 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 , < 1a17ea9861e89585361caa8bc231bd22dc6dbe7d (git)
Affected: 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 , < c5fc49d8470c5ebf3b41607600f277158f159950 (git)
Affected: 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 , < 3d4c2268bd7243c3780fe32bf24ff876da272acf (git)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.90 , ≤ 6.12.* (semver)
Unaffected: 6.18.32 , ≤ 6.18.* (semver)
Unaffected: 7.0.9 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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This inconsistency corrupts the subsequent GEM object\\nsize check for certain pixel format and dimension combinations.\\n\\nFor example, with NV12 (vsub=2) and a 1-pixel-tall framebuffer the\\nGEM size validation path sees height=0 instead of height=1. The\\nexpression (height - 1) then wraps to UINT_MAX as an unsigned int,\\ncausing min_size to overflow and wrap back to a small value. A tiny\\nGEM object therefore passes the size guard, yet when the GPU accesses\\nthe chroma plane it will read or write memory beyond the object\u0027s\\nbounds.\\n\\nFix by replacing the open-coded divisions with drm_format_info_plane_width()\\nand drm_format_info_plane_height(), which use DIV_ROUND_UP() and match\\nthe calculation already used in framebuffer_check().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/gpu/drm/drm_gem_framebuffer_helper.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4c3dbb2c312c9fafbac30d98c523b8b1f3455d78\",\"lessThan\":\"11427ad6c9f0def5ce567982b785da3191946430\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4c3dbb2c312c9fafbac30d98c523b8b1f3455d78\",\"lessThan\":\"adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4c3dbb2c312c9fafbac30d98c523b8b1f3455d78\",\"lessThan\":\"22922f7dae74409fc4bf0f1142710cb6b8ce8cc2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4c3dbb2c312c9fafbac30d98c523b8b1f3455d78\",\"lessThan\":\"6b992591e04f2cce813bcf239b354f375bbf84d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4c3dbb2c312c9fafbac30d98c523b8b1f3455d78\",\"lessThan\":\"1da4ab7189f1064b3b712b388772c008b4d82580\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4c3dbb2c312c9fafbac30d98c523b8b1f3455d78\",\"lessThan\":\"1a17ea9861e89585361caa8bc231bd22dc6dbe7d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4c3dbb2c312c9fafbac30d98c523b8b1f3455d78\",\"lessThan\":\"c5fc49d8470c5ebf3b41607600f277158f159950\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4c3dbb2c312c9fafbac30d98c523b8b1f3455d78\",\"lessThan\":\"3d4c2268bd7243c3780fe32bf24ff876da272acf\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/gpu/drm/drm_gem_framebuffer_helper.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.90\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.32\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.9\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"A5779233-0F1F-4BD7-980B-44C1E527FFC5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.90\",\"matchCriteriaId\":\"3BAAA2BE-6EEC-45D5-AD66-50F63CA20483\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.32\",\"matchCriteriaId\":\"CB9F1FA8-6D5E-42B1-9877-57BACFE5C886\"},{\"vulnerable\":tr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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T12:40:46+00:00",
      "cve": "CVE-2026-46209",
      "id": "CVE-2026-46209",
      "initial_release_date": "2026-05-28T00:00:00+00:00",
      "product_status:fixed": "1980",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46209.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-31T16:54:27Z",
      "cve": "CVE-2026-46209",
      "id": "CVE-2026-46209",
      "initial_release_date": "2026-05-29T01:15:05Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "420",
      "product_status:known_not_affected": "176",
      "product_status:recommended": "370",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46209",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46209.json",
      "version": "21"
    }
  }
}



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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

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.