drm/i915: Fix potential overflow of shmem scatterlist length

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Summary

CVECVE-2026-43368
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:47 UTC
Updated2026-05-08 15:16:47 UTC
DescriptionIn 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)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0b62af28f249b9c4036a05acfb053058dc02e2e2 aeb7255531ba4a5c3a64938577170d08b78de399 git Not specified
CNA Linux Linux affected 0b62af28f249b9c4036a05acfb053058dc02e2e2 1c956f0fccc26fefcbb507516c49d1db41c40471 git Not specified
CNA Linux Linux affected 0b62af28f249b9c4036a05acfb053058dc02e2e2 eae4bf4107571283031db96ce132e951615e2ae4 git Not specified
CNA Linux Linux affected 0b62af28f249b9c4036a05acfb053058dc02e2e2 21a301f12d18797bf889c15497f922edfdaece3a git Not specified
CNA Linux Linux affected 0b62af28f249b9c4036a05acfb053058dc02e2e2 029ae067431ab9d0fca479bdabe780fa436706ea git Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.19 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/aeb7255531ba4a5c3a64938577170d08b78de399 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21a301f12d18797bf889c15497f922edfdaece3a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1c956f0fccc26fefcbb507516c49d1db41c40471 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/029ae067431ab9d0fca479bdabe780fa436706ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eae4bf4107571283031db96ce132e951615e2ae4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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