Vulnerability-Lookup

GHSA-MXC8-68WC-4VVM

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

In the Linux kernel, the following vulnerability has been resolved:

cxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach()

In cxl_cancel_auto_attach(), it assumes cxled->pos is a valid index for accessing p->targets[]. However, cxled->pos can be set to negative errno in cxl_region_sort_targets() if cxl_calc_interleave_pos() fails. This causes the driver to use a negative index to access p->targets[], resulting in out-of-bounds access.

Fix it by walking p->targets[] instead of using cxled->pos directly.

Severity

8.4 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74275"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:26Z",
    "severity": "HIGH"
  },
  "details": "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-\u003epos is a valid index for\naccessing p-\u003etargets[]. However, cxled-\u003epos 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-\u003etargets[],\nresulting in out-of-bounds access.\n\nFix it by walking p-\u003etargets[] instead of using cxled-\u003epos directly.",
  "id": "GHSA-mxc8-68wc-4vvm",
  "modified": "2026-08-17T06:33:35Z",
  "published": "2026-08-15T06:32:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74275"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44b2397eb67b7f728640989a22d062e41f94ab64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cbda6a2c2bec2a5fb30a2ce85baeab15b5fc7db3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74275 (GCVE-0-2026-74275)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:45

Title

cxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach()

Summary

In the Linux kernel, the following vulnerability has been resolved: cxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach() In cxl_cancel_auto_attach(), it assumes cxled->pos is a valid index for accessing p->targets[]. However, cxled->pos can be set to negative errno in cxl_region_sort_targets() if cxl_calc_interleave_pos() fails. This causes the driver to use a negative index to access p->targets[], resulting in out-of-bounds access. Fix it by walking p->targets[] instead of using cxled->pos directly.

Severity

8.4 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/44b2397eb67b7f728…
https://git.kernel.org/stable/c/cbda6a2c2bec2a5fb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 87805c32e6ad7b5ce2d9f7f47e76081857a4a335 , < 44b2397eb67b7f728640989a22d062e41f94ab64 (git) Affected: 87805c32e6ad7b5ce2d9f7f47e76081857a4a335 , < cbda6a2c2bec2a5fb30a2ce85baeab15b5fc7db3 (git)
Linux	Linux	Affected: 7.1 Unaffected: 0 , < 7.1 (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "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": "44b2397eb67b7f728640989a22d062e41f94ab64",
              "status": "affected",
              "version": "87805c32e6ad7b5ce2d9f7f47e76081857a4a335",
              "versionType": "git"
            },
            {
              "lessThan": "cbda6a2c2bec2a5fb30a2ce85baeab15b5fc7db3",
              "status": "affected",
              "version": "87805c32e6ad7b5ce2d9f7f47e76081857a4a335",
              "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": "7.1"
            },
            {
              "lessThan": "7.1",
              "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": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003epos is a valid index for\naccessing p-\u003etargets[]. However, cxled-\u003epos 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-\u003etargets[],\nresulting in out-of-bounds access.\n\nFix it by walking p-\u003etargets[] instead of using cxled-\u003epos directly."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is in the CXL region driver reached via local kernel paths\u2014CXL endpoint decoder auto-discovery/attach, sysfs region/target management under /sys/bus/cxl/, and PCI/CXL device removal\u2014not 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-\u003epos, 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-\u003epos as an index into p-\u003etargets[], leaking adjacent kernel memory from the cxl_region_params structure before the array base.\nI:H - cxl_cancel_auto_attach() writes NULL via p-\u003etargets[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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:45:17.863Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74275",
    "datePublished": "2026-08-15T05:57:47.455Z",
    "dateReserved": "2026-08-15T05:44:03.879Z",
    "dateUpdated": "2026-08-17T05:45:17.863Z",
    "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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GHSA-MXC8-68WC-4VVM

CVE-2026-74275 (GCVE-0-2026-74275)

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Nomenclature