{"id":"CVE-2026-43368","summary":"drm/i915: Fix potential overflow of shmem scatterlist length","details":"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's 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)","modified":"2026-07-15T01:49:18.832180254Z","published":"2026-05-08T14:21:20.500Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43368.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/029ae067431ab9d0fca479bdabe780fa436706ea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1c956f0fccc26fefcbb507516c49d1db41c40471"},{"type":"WEB","url":"https://git.kernel.org/stable/c/21a301f12d18797bf889c15497f922edfdaece3a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aeb7255531ba4a5c3a64938577170d08b78de399"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eae4bf4107571283031db96ce132e951615e2ae4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43368.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43368"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0b62af28f249b9c4036a05acfb053058dc02e2e2"},{"fixed":"aeb7255531ba4a5c3a64938577170d08b78de399"},{"fixed":"1c956f0fccc26fefcbb507516c49d1db41c40471"},{"fixed":"eae4bf4107571283031db96ce132e951615e2ae4"},{"fixed":"21a301f12d18797bf889c15497f922edfdaece3a"},{"fixed":"029ae067431ab9d0fca479bdabe780fa436706ea"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43368.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.5.0"},{"fixed":"6.6.130"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43368.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}