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GHSA-2GPX-R754-7J65

Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-18 18:31

Details

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

scsi: sd: Fix error handling in sd_probe() after large pool creation failure

After device_add(&sdkp->disk_dev) succeeds, sd_large_pool_create() failure must unregister disk_dev and let scsi_disk_release() free sdkp. Going through out_free_index kfree()s an already registered device and leaks the sysfs entry.

Severity

8.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-90268"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:23Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: sd: Fix error handling in sd_probe() after large pool creation failure\n\nAfter device_add(\u0026sdkp-\u003edisk_dev) succeeds, sd_large_pool_create()\nfailure must unregister disk_dev and let scsi_disk_release() free\nsdkp. Going through out_free_index kfree()s an already registered device\nand leaks the sysfs entry.",
  "id": "GHSA-2gpx-r754-7j65",
  "modified": "2026-09-18T18:31:28Z",
  "published": "2026-09-17T18:31:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90268"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/748a14a0d41cfe3017251c11b314f85045414942"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3cc6ea1a745e7f5d326f919a428b244fa119d8f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-90268 (GCVE-0-2026-90268)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-18 17:54

Title

scsi: sd: Fix error handling in sd_probe() after large pool creation failure

Summary

In the Linux kernel, the following vulnerability has been resolved: scsi: sd: Fix error handling in sd_probe() after large pool creation failure After device_add(&sdkp->disk_dev) succeeds, sd_large_pool_create() failure must unregister disk_dev and let scsi_disk_release() free sdkp. Going through out_free_index kfree()s an already registered device and leaks the sysfs entry.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/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/748a14a0d41cfe301…
https://git.kernel.org/stable/c/e3cc6ea1a745e7f5d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7179e626b76eb42f2529c6f6dd6ba88ea2445372 , < 748a14a0d41cfe3017251c11b314f85045414942 (git) Affected: 7179e626b76eb42f2529c6f6dd6ba88ea2445372 , < e3cc6ea1a745e7f5d326f919a428b244fa119d8f (git)
Linux	Linux	Affected: 7.1 Unaffected: 0 , < 7.1 (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/sd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "748a14a0d41cfe3017251c11b314f85045414942",
              "status": "affected",
              "version": "7179e626b76eb42f2529c6f6dd6ba88ea2445372",
              "versionType": "git"
            },
            {
              "lessThan": "e3cc6ea1a745e7f5d326f919a428b244fa119d8f",
              "status": "affected",
              "version": "7179e626b76eb42f2529c6f6dd6ba88ea2445372",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/sd.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": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: sd: Fix error handling in sd_probe() after large pool creation failure\n\nAfter device_add(\u0026sdkp-\u003edisk_dev) succeeds, sd_large_pool_create()\nfailure must unregister disk_dev and let scsi_disk_release() free\nsdkp. Going through out_free_index kfree()s an already registered device\nand leaks the sysfs entry."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - After iscsi_scan_session()-\u003escsi_scan_target()-\u003escsi_probe_and_add_lun() binds TYPE_DISK, sd_probe()-\u003esd_revalidate_disk()-\u003eread_capacity_16() takes the Logical Block Length from the target\u2019s READ CAPACITY(16) Data-In at buffer[8] (or READ CAPACITY(10) at buffer[4]) over iSCSI TCP; that value is what enters the sd_large_pool_create() error path.\nAC:H - The bad goto is taken only when sd_large_page_pool is still NULL and mempool_create_page_pool(SD_MEMPOOL_SIZE=2, get_order(BLK_MAX_BLOCK_SIZE)) fails its GFP_KERNEL order-4 preallocation of two 64K pages; a remote target cannot force that allocator failure or whether an earlier large-sector disk already created the pool.\nPR:N - The attacker is the iSCSI target supplying INQUIRY PDT=TYPE_DISK and the READ CAPACITY block length during automatic LUN scan; scsi_bus_probe()-\u003esd_probe() runs on the initiator with no capability check against the target, and iSCSI is commonly deployed without CHAP.\nUI:N - Once the session is ISCSI_SESSION_LOGGED_IN, iscsi_scan_session work calls scsi_scan_target, which invokes sd_probe and sd_revalidate_disk with no open(), mount, or operator action; the target alone presents the LUN and the capacity response.\nS:U - kfree(sdkp) while sdkp-\u003edisk_dev remains registered after device_add() corrupts only the initiator kernel\u2019s device-model/sysfs state for that scsi_disk; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - out_free_index kfree()s the scsi_disk that embeds the still-registered disk_dev, so later sysfs reads of sd_disk_groups attributes via to_scsi_disk() and scsi_disk_release() operate on a freed heap object, giving a use-after-free read primitive.\nI:H - The same kfree leaves disk_dev, gd-\u003eprivate_data, and the sdev drvdata set by dev_set_drvdata() pointing at freed sdkp; writable scsi_disk sysfs stores and scsi_disk_release()\u2019s second kfree/ida_free then write through that UAF, enabling heap corruption and control-flow hijack.\nA:H - Use-after-free of the registered scsi_disk, including scsi_disk_release() running on already-freed memory (double-free of sdkp and a second ida_free of sdkp-\u003eindex), oopses or panics when udev, sysfs, or parent sdev removal touches disk_dev."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T17:54:15.152Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/748a14a0d41cfe3017251c11b314f85045414942"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3cc6ea1a745e7f5d326f919a428b244fa119d8f"
        }
      ],
      "title": "scsi: sd: Fix error handling in sd_probe() after large pool creation failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90268",
    "datePublished": "2026-09-17T16:08:03.312Z",
    "dateReserved": "2026-09-11T19:38:34.796Z",
    "dateUpdated": "2026-09-18T17:54:15.152Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

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-2GPX-R754-7J65

CVE-2026-90268 (GCVE-0-2026-90268)

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