{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-74275",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-15T05:44:03.879Z",
        "datePublished": "2026-08-15T05:57:47.455Z",
        "dateUpdated": "2026-08-17T05:45:17.863Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T05:45:17.863Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "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."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 8.4,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "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."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/cxl/core/region.c"
                    ],
                    "versions": [
                        {
                            "version": "87805c32e6ad7b5ce2d9f7f47e76081857a4a335",
                            "lessThan": "44b2397eb67b7f728640989a22d062e41f94ab64",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "87805c32e6ad7b5ce2d9f7f47e76081857a4a335",
                            "lessThan": "cbda6a2c2bec2a5fb30a2ce85baeab15b5fc7db3",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/cxl/core/region.c"
                    ],
                    "versions": [
                        {
                            "version": "7.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.5",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.1",
                                    "versionEndExcluding": "7.1.5"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.1",
                                    "versionEndExcluding": "7.2"
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                            ]
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                    ]
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/44b2397eb67b7f728640989a22d062e41f94ab64"
                },
                {
                    "url": "https://git.kernel.org/stable/c/cbda6a2c2bec2a5fb30a2ce85baeab15b5fc7db3"
                }
            ],
            "title": "cxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach()",
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                "engine": "bippy-1.2.0"
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}