138 lines
7.7 KiB
JSON
138 lines
7.7 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-74275",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-15T05:44:03.879Z",
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"datePublished": "2026-08-15T05:57:47.455Z",
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"dateUpdated": "2026-08-17T05:45:17.863Z"
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},
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T05:45:17.863Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach()\n\nIn cxl_cancel_auto_attach(), it assumes cxled->pos is a valid index for\naccessing p->targets[]. However, cxled->pos can be set to negative errno\nin cxl_region_sort_targets() if cxl_calc_interleave_pos() fails. This\ncauses the driver to use a negative index to access p->targets[],\nresulting in out-of-bounds access.\n\nFix it by walking p->targets[] instead of using cxled->pos directly."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The flaw is in the CXL region driver reached via local kernel paths—CXL endpoint decoder auto-discovery/attach, sysfs region/target management under /sys/bus/cxl/, and PCI/CXL device removal—not via any network protocol or remote packet handler.\nAC:L - Once CXL auto-region assembly fails in cxl_region_sort_targets() leaving a decoder AUTO_STAGED with a negative cxled->pos, an attacker who can present or remove CXL endpoints can reliably trigger cxl_cancel_auto_attach() during decoder teardown without uncontrollable timing or memory-layout dependencies.\nPR:N - The vulnerable teardown path runs automatically during kernel-driven CXL endpoint decoder unregistration after failed auto-assembly; it does not require authenticated access or elevated credentials, only that a CXL topology causes cxl_calc_interleave_pos() to fail before the decoder is removed.\nUI:N - Exploitation requires no end-user interaction such as opening files or mounting filesystems; it is triggered by kernel CXL auto-discovery, region assembly failure, and subsequent endpoint decoder detach/unregister events.\nS:U - The out-of-bounds access corrupts kernel cxl_region_params memory within the same kernel security boundary and does not by itself cross VM, container, or IOMMU isolation boundaries.\nC:H - cxl_region_by_target() performs an out-of-bounds read using the negative cxled->pos as an index into p->targets[], leaking adjacent kernel memory from the cxl_region_params structure before the array base.\nI:H - cxl_cancel_auto_attach() writes NULL via p->targets[pos] using the same negative index, corrupting adjacent fields such as the region resource pointer and other cxl_region_params metadata exploitable for further memory corruption.\nA:H - Out-of-bounds access and corruption of critical region metadata pointers can cause kernel oops, panic, or hang during CXL region teardown on systems with CONFIG_CXL_REGION and interleaved CXL memory expanders."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/cxl/core/region.c"
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],
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"versions": [
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{
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"version": "87805c32e6ad7b5ce2d9f7f47e76081857a4a335",
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"lessThan": "44b2397eb67b7f728640989a22d062e41f94ab64",
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"status": "affected",
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"status": "affected",
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}
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},
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{
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"product": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/cxl/core/region.c"
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],
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"versions": [
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{
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"version": "7.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"versionEndExcluding": "7.1.5"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/44b2397eb67b7f728640989a22d062e41f94ab64"
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},
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{
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"url": "https://git.kernel.org/stable/c/cbda6a2c2bec2a5fb30a2ce85baeab15b5fc7db3"
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}
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],
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"title": "cxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach()",
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