CVE-2026-43368 (GCVE-0-2026-43368)
Vulnerability from cvelistv5
Published
2026-05-08 14:21
Modified
2026-10-19 19:16
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/i915: Fix potential overflow of shmem scatterlist length When a scatterlists table of a GEM shmem object of size 4 GB or more is populated with pages allocated from a folio, unsigned int .length attribute of a scatterlist may get overflowed if total byte length of pages allocated to that single scatterlist happens to reach or cross the 4GB limit. As a consequence, users of the object may suffer from hitting unexpected, premature end of the object's backing pages. [278.780187] ------------[ cut here ]------------ [278.780377] WARNING: CPU: 1 PID: 2326 at drivers/gpu/drm/i915/i915_mm.c:55 remap_sg+0x199/0x1d0 [i915] ... [278.780654] CPU: 1 UID: 0 PID: 2326 Comm: gem_mmap_offset Tainted: G S U 6.17.0-rc1-CI_DRM_16981-ged823aaa0607+ #1 PREEMPT(voluntary) [278.780656] Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER [278.780658] Hardware name: Intel Corporation Meteor Lake Client Platform/MTL-P LP5x T3 RVP, BIOS MTLPFWI1.R00.3471.D91.2401310918 01/31/2024 [278.780659] RIP: 0010:remap_sg+0x199/0x1d0 [i915] ... [278.780786] Call Trace: [278.780787] <TASK> [278.780788] ? __apply_to_page_range+0x3e6/0x910 [278.780795] ? __pfx_remap_sg+0x10/0x10 [i915] [278.780906] apply_to_page_range+0x14/0x30 [278.780908] remap_io_sg+0x14d/0x260 [i915] [278.781013] vm_fault_cpu+0xd2/0x330 [i915] [278.781137] __do_fault+0x3a/0x1b0 [278.781140] do_fault+0x322/0x640 [278.781143] __handle_mm_fault+0x938/0xfd0 [278.781150] handle_mm_fault+0x12c/0x300 [278.781152] ? lock_mm_and_find_vma+0x4b/0x760 [278.781155] do_user_addr_fault+0x2d6/0x8e0 [278.781160] exc_page_fault+0x96/0x2c0 [278.781165] asm_exc_page_fault+0x27/0x30 ... That issue was apprehended by the author of a change that introduced it, and potential risk even annotated with a comment, but then never addressed. When adding folio pages to a scatterlist table, take care of byte length of any single scatterlist not exceeding max_segment. (cherry picked from commit 06249b4e691a75694c014a61708c007fb5755f60)
References
Impacted products
Vendor Product Version
Linux Linux Version: 0b62af28f249b9c4036a05acfb053058dc02e2e2
Version: 0b62af28f249b9c4036a05acfb053058dc02e2e2
Version: 0b62af28f249b9c4036a05acfb053058dc02e2e2
Version: 0b62af28f249b9c4036a05acfb053058dc02e2e2
Version: 0b62af28f249b9c4036a05acfb053058dc02e2e2
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    "dateUpdated": "2026-10-19T19:16:27.757Z",
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Under the required uncertainty rule, this is treated as high integrity impact.\\nA:H - At minimum the bug can cause premature scatterlist termination leading to kernel warnings/errors, BUG/OOPS-class failures, GPU faults, hangs, or very large unreleased backing-page leaks when triggered repeatedly.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0b62af28f249b9c4036a05acfb053058dc02e2e2\", \"lessThan\": \"aeb7255531ba4a5c3a64938577170d08b78de399\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0b62af28f249b9c4036a05acfb053058dc02e2e2\", \"lessThan\": \"1c956f0fccc26fefcbb507516c49d1db41c40471\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0b62af28f249b9c4036a05acfb053058dc02e2e2\", \"lessThan\": \"eae4bf4107571283031db96ce132e951615e2ae4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0b62af28f249b9c4036a05acfb053058dc02e2e2\", \"lessThan\": \"21a301f12d18797bf889c15497f922edfdaece3a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0b62af28f249b9c4036a05acfb053058dc02e2e2\", \"lessThan\": \"029ae067431ab9d0fca479bdabe780fa436706ea\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/gpu/drm/i915/gem/i915_gem_shmem.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.130\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.78\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/gpu/drm/i915/gem/i915_gem_shmem.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/aeb7255531ba4a5c3a64938577170d08b78de399\"}, {\"url\": \"https://git.kernel.org/stable/c/1c956f0fccc26fefcbb507516c49d1db41c40471\"}, {\"url\": \"https://git.kernel.org/stable/c/eae4bf4107571283031db96ce132e951615e2ae4\"}, {\"url\": \"https://git.kernel.org/stable/c/21a301f12d18797bf889c15497f922edfdaece3a\"}, {\"url\": \"https://git.kernel.org/stable/c/029ae067431ab9d0fca479bdabe780fa436706ea\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/i915: Fix potential overflow of shmem scatterlist length\\n\\nWhen a scatterlists table of a GEM shmem object of size 4 GB or more is\\npopulated with pages allocated from a folio, unsigned int .length\\nattribute of a scatterlist may get overflowed if total byte length of\\npages allocated to that single scatterlist happens to reach or cross the\\n4GB limit.  As a consequence, users of the object may suffer from hitting\\nunexpected, premature end of the object\u0027s backing pages.\\n\\n[278.780187] ------------[ cut here ]------------\\n[278.780377] WARNING: CPU: 1 PID: 2326 at drivers/gpu/drm/i915/i915_mm.c:55 remap_sg+0x199/0x1d0 [i915]\\n...\\n[278.780654] CPU: 1 UID: 0 PID: 2326 Comm: gem_mmap_offset Tainted: G S   U              6.17.0-rc1-CI_DRM_16981-ged823aaa0607+ #1 PREEMPT(voluntary)\\n[278.780656] Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER\\n[278.780658] Hardware name: Intel Corporation Meteor Lake Client Platform/MTL-P LP5x T3 RVP, BIOS MTLPFWI1.R00.3471.D91.2401310918 01/31/2024\\n[278.780659] RIP: 0010:remap_sg+0x199/0x1d0 [i915]\\n...\\n[278.780786] Call Trace:\\n[278.780787]  \u003cTASK\u003e\\n[278.780788]  ? __apply_to_page_range+0x3e6/0x910\\n[278.780795]  ? __pfx_remap_sg+0x10/0x10 [i915]\\n[278.780906]  apply_to_page_range+0x14/0x30\\n[278.780908]  remap_io_sg+0x14d/0x260 [i915]\\n[278.781013]  vm_fault_cpu+0xd2/0x330 [i915]\\n[278.781137]  __do_fault+0x3a/0x1b0\\n[278.781140]  do_fault+0x322/0x640\\n[278.781143]  __handle_mm_fault+0x938/0xfd0\\n[278.781150]  handle_mm_fault+0x12c/0x300\\n[278.781152]  ? lock_mm_and_find_vma+0x4b/0x760\\n[278.781155]  do_user_addr_fault+0x2d6/0x8e0\\n[278.781160]  exc_page_fault+0x96/0x2c0\\n[278.781165]  asm_exc_page_fault+0x27/0x30\\n...\\n\\nThat issue was apprehended by the author of a change that introduced it,\\nand potential risk even annotated with a comment, but then never addressed.\\n\\nWhen adding folio pages to a scatterlist table, take care of byte length\\nof any single scatterlist not exceeding max_segment.\\n\\n(cherry picked from commit 06249b4e691a75694c014a61708c007fb5755f60)\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.130\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.78\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.19\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.9\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"6.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:27:31.468Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43368\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:16:27.757Z\", \"dateReserved\": \"2026-05-01T14:12:56.005Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-08T14:21:20.500Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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