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FKIE_CVE-2026-74274

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: cxl/region: Fill first free targets[] slot during auto-discovery Any invalid endpoint decoder pointer in the target array of an active region is not allowed by cxl driver. This means cxl driver always assumes the first p->nr_targets entries of the target array in an auto-assembly region are valid. However, there are scenarios that could leave NULL endpoint decoder pointer holes in the target array. 1. When cxl_cancel_auto_attach() removes an endpoint decoder from a target array, the target slot is set to NULL. If the removed endpoint decoder is not the last element in the target array, the target array will contain a NULL hole. 2. When a auto-assembly region removes an assigned endpoint decoder, if the removed endpoint decoder is not the last element in the target array, always remains a NULL hole in the target array. When a NULL pointer hole exists in a region's target array, it introduces two potential problems: 1. Access an endpoint decoder via a NULL pointer. it always trigger calltrace like that. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI RIP: 0010:cxl_calc_interleave_pos+0x26/0x810 [cxl_core] Call Trace: <TASK> cxl_region_attach+0xc50/0x2140 [cxl_core] cxl_add_to_region+0x321/0x2330 [cxl_core] discover_region+0x92/0x150 [cxl_port] device_for_each_child+0xf3/0x170 cxl_port_probe+0x150/0x200 [cxl_port] cxl_bus_probe+0x4f/0xa0 [cxl_core] really_probe+0x1c8/0x960 __driver_probe_device+0x323/0x450 driver_probe_device+0x45/0x120 __device_attach_driver+0x15d/0x280 bus_for_each_drv+0x10f/0x190 2. Not having enough valid endpoint decoders attached to an auto-assembly region. if an auto-assembly region is created with lock flag or assigned endpoint decoder with lock flag, which means assigned endpoint decoder will not be reset during detaching, they could re-attach to the auto-assembly region again. But cxl region driver relies on p->nr_targets to verify whether the required number of endpoint decoders has been attached, and NULL endpoint decoder pointers are still counted in that case. To fix above issues, adjust cxl_region_attach_auto() logic to find the first free target slot for endpoint decoder attachment, this ensures NULL holes in the target array are filled, rather than adding new endpoint decoders at the tail of the target array.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6fde3fcdfec438ba0df26e25a8ac7c3707211799
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/aa8a76711c15041ec1e42c3a74c15c2df0bd31f6

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/cxl/core/region.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6fde3fcdfec438ba0df26e25a8ac7c3707211799",
              "status": "affected",
              "version": "2230c4bdc4120417799c74326ade3123da226d54",
              "versionType": "git"
            },
            {
              "lessThan": "aa8a76711c15041ec1e42c3a74c15c2df0bd31f6",
              "status": "affected",
              "version": "2230c4bdc4120417799c74326ade3123da226d54",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/cxl/core/region.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/region: Fill first free targets[] slot during auto-discovery\n\nAny invalid endpoint decoder pointer in the target array of an active\nregion is not allowed by cxl driver. This means cxl driver always\nassumes the first p-\u003enr_targets entries of the target array in an\nauto-assembly region are valid. However, there are scenarios that could\nleave NULL endpoint decoder pointer holes in the target array.\n\n1. When cxl_cancel_auto_attach() removes an endpoint decoder from a\n   target array, the target slot is set to NULL. If the removed endpoint\n   decoder is not the last element in the target array, the target array\n   will contain a NULL hole.\n\n2. When a auto-assembly region removes an assigned endpoint decoder, if\n   the removed endpoint decoder is not the last element in the target\n   array, always remains a NULL hole in the target array.\n\nWhen a NULL pointer hole exists in a region\u0027s target array, it\nintroduces two potential problems:\n1. Access an endpoint decoder via a NULL pointer. it always trigger\n   calltrace like that.\n    Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI\n    RIP: 0010:cxl_calc_interleave_pos+0x26/0x810 [cxl_core]\n    Call Trace:\n      \u003cTASK\u003e\n      cxl_region_attach+0xc50/0x2140 [cxl_core]\n      cxl_add_to_region+0x321/0x2330 [cxl_core]\n      discover_region+0x92/0x150 [cxl_port]\n      device_for_each_child+0xf3/0x170\n      cxl_port_probe+0x150/0x200 [cxl_port]\n      cxl_bus_probe+0x4f/0xa0 [cxl_core]\n      really_probe+0x1c8/0x960\n      __driver_probe_device+0x323/0x450\n      driver_probe_device+0x45/0x120\n      __device_attach_driver+0x15d/0x280\n      bus_for_each_drv+0x10f/0x190\n\n2. Not having enough valid endpoint decoders attached to an\n   auto-assembly region. if an auto-assembly region is created with lock\n   flag or assigned endpoint decoder with lock flag, which means\n   assigned endpoint decoder will not be reset during detaching, they\n   could re-attach to the auto-assembly region again. But cxl region\n   driver relies on p-\u003enr_targets to verify whether the required number\n   of endpoint decoders has been attached, and NULL endpoint decoder\n   pointers are still counted in that case.\n\nTo fix above issues, adjust cxl_region_attach_auto() logic to find the\nfirst free target slot for endpoint decoder attachment, this ensures\nNULL holes in the target array are filled, rather than adding new\nendpoint decoders at the tail of the target array."
    }
  ],
  "id": "CVE-2026-74274",
  "lastModified": "2026-08-17T06:19:21.097",
  "metrics": {},
  "published": "2026-08-15T06:22:26.793",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6fde3fcdfec438ba0df26e25a8ac7c3707211799"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aa8a76711c15041ec1e42c3a74c15c2df0bd31f6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-74274 (GCVE-0-2026-74274)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:16

Title

cxl/region: Fill first free targets[] slot during auto-discovery

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/6fde3fcdfec438ba0…
https://git.kernel.org/stable/c/aa8a76711c15041ec…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2230c4bdc4120417799c74326ade3123da226d54 , < 6fde3fcdfec438ba0df26e25a8ac7c3707211799 (git) Affected: 2230c4bdc4120417799c74326ade3123da226d54 , < aa8a76711c15041ec1e42c3a74c15c2df0bd31f6 (git)
Linux	Linux	Affected: 6.19 Unaffected: 0 , < 6.19 (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/cxl/core/region.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6fde3fcdfec438ba0df26e25a8ac7c3707211799",
              "status": "affected",
              "version": "2230c4bdc4120417799c74326ade3123da226d54",
              "versionType": "git"
            },
            {
              "lessThan": "aa8a76711c15041ec1e42c3a74c15c2df0bd31f6",
              "status": "affected",
              "version": "2230c4bdc4120417799c74326ade3123da226d54",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/cxl/core/region.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/region: Fill first free targets[] slot during auto-discovery\n\nAny invalid endpoint decoder pointer in the target array of an active\nregion is not allowed by cxl driver. This means cxl driver always\nassumes the first p-\u003enr_targets entries of the target array in an\nauto-assembly region are valid. However, there are scenarios that could\nleave NULL endpoint decoder pointer holes in the target array.\n\n1. When cxl_cancel_auto_attach() removes an endpoint decoder from a\n   target array, the target slot is set to NULL. If the removed endpoint\n   decoder is not the last element in the target array, the target array\n   will contain a NULL hole.\n\n2. When a auto-assembly region removes an assigned endpoint decoder, if\n   the removed endpoint decoder is not the last element in the target\n   array, always remains a NULL hole in the target array.\n\nWhen a NULL pointer hole exists in a region\u0027s target array, it\nintroduces two potential problems:\n1. Access an endpoint decoder via a NULL pointer. it always trigger\n   calltrace like that.\n    Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI\n    RIP: 0010:cxl_calc_interleave_pos+0x26/0x810 [cxl_core]\n    Call Trace:\n      \u003cTASK\u003e\n      cxl_region_attach+0xc50/0x2140 [cxl_core]\n      cxl_add_to_region+0x321/0x2330 [cxl_core]\n      discover_region+0x92/0x150 [cxl_port]\n      device_for_each_child+0xf3/0x170\n      cxl_port_probe+0x150/0x200 [cxl_port]\n      cxl_bus_probe+0x4f/0xa0 [cxl_core]\n      really_probe+0x1c8/0x960\n      __driver_probe_device+0x323/0x450\n      driver_probe_device+0x45/0x120\n      __device_attach_driver+0x15d/0x280\n      bus_for_each_drv+0x10f/0x190\n\n2. Not having enough valid endpoint decoders attached to an\n   auto-assembly region. if an auto-assembly region is created with lock\n   flag or assigned endpoint decoder with lock flag, which means\n   assigned endpoint decoder will not be reset during detaching, they\n   could re-attach to the auto-assembly region again. But cxl region\n   driver relies on p-\u003enr_targets to verify whether the required number\n   of endpoint decoders has been attached, and NULL endpoint decoder\n   pointers are still counted in that case.\n\nTo fix above issues, adjust cxl_region_attach_auto() logic to find the\nfirst free target slot for endpoint decoder attachment, this ensures\nNULL holes in the target array are filled, rather than adding new\nendpoint decoders at the tail of the target array."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:16:18.253Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6fde3fcdfec438ba0df26e25a8ac7c3707211799"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa8a76711c15041ec1e42c3a74c15c2df0bd31f6"
        }
      ],
      "title": "cxl/region: Fill first free targets[] slot during auto-discovery",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74274",
    "datePublished": "2026-08-15T05:57:46.798Z",
    "dateReserved": "2026-08-15T05:44:03.879Z",
    "dateUpdated": "2026-08-17T05:16:18.253Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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FKIE_CVE-2026-74274

CVE-2026-74274 (GCVE-0-2026-74274)

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Sightings

Nomenclature