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CVE-2026-74273 (GCVE-0-2026-74273)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:16
VLAI
Title
cxl/region: Block region delete during region creation
Summary
In the Linux kernel, the following vulnerability has been resolved: cxl/region: Block region delete during region creation Expand the range lock, rename it "regions_lock", to disable region deletion in the critical period between construct_region() and attach_target(), as well as the period between device_add() and registering the remove actions. Otherwise, userspace can confuse the kernel. It can violate the assumption the region stays registered through the completion of cxl_add_to_region(). It can violate the assumption that devm_add_action_or_reset() is working with a live 'struct cxl_region'. It is ok for the region to disappear outside of those windows as that mirrors device hotplug flows where the proper locks are held.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a32320b71f085f8d82afedcf285f1682c8c00aed , < b0b6a9c65cb72c901fdcc6ae83d7afd70cdca1b8 (git)
Affected: a32320b71f085f8d82afedcf285f1682c8c00aed , < d91feb88692e81b00cd22f0125cfcd04970b4a0b (git)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/cxl/core/port.c",
            "drivers/cxl/core/region.c",
            "drivers/cxl/cxl.h"
          ],
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/region: Block region delete during region creation\n\nExpand the range lock, rename it \"regions_lock\", to disable region deletion\nin the critical period between construct_region() and attach_target(), as\nwell as the period between device_add() and registering the remove actions.\n\nOtherwise, userspace can confuse the kernel. It can violate the assumption\nthe region stays registered through the completion of cxl_add_to_region().\nIt can violate the assumption that devm_add_action_or_reset() is working\nwith a live \u0027struct cxl_region\u0027.\n\nIt is ok for the region to disappear outside of those windows as that\nmirrors device hotplug flows where the proper locks are held."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:16:17.155Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/b0b6a9c65cb72c901fdcc6ae83d7afd70cdca1b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/d91feb88692e81b00cd22f0125cfcd04970b4a0b"
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      ],
      "title": "cxl/region: Block region delete during region creation",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74273",
    "datePublished": "2026-08-15T05:57:46.134Z",
    "dateReserved": "2026-08-15T05:44:03.879Z",
    "dateUpdated": "2026-08-17T05:16:17.155Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-05",
      "epss": "0.00155",
      "percentile": "0.05012"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T15:04:22+00:00",
      "cve": "CVE-2026-74273",
      "id": "CVE-2026-74273",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cxl/region: Block region delete during region creation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74273.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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