Vulnerability-Lookup

GHSA-83WP-8PH8-8M42

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

Details

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

ARM: 9481/2: breakpoint: CFI breakpoints only on demand

This removes the stub hw_breakpoint_cfi_handler() from ARM, making it not steal breakpoint type 0x03 (ARM_ENTRY_CFI_BREAKPOINT) unless CFI is actively used in the kernel.

When not instrumenting with CFI, or when a breakpoint is issued in userspace, we fall through to return 1 from hw_breakpoint_pending() "unhandled fault" so userspace can make use of this breakpoint.

Tested with LKDTM and this command line: echo CFI_FORWARD_PROTO > /sys/kernel/debug/provoke-crash/DIRECT still works as expected.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-90306"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9481/2: breakpoint: CFI breakpoints only on demand\n\nThis removes the stub hw_breakpoint_cfi_handler() from ARM, making\nit not steal breakpoint type 0x03 (ARM_ENTRY_CFI_BREAKPOINT) unless\nCFI is actively used in the kernel.\n\nWhen not instrumenting with CFI, or when a breakpoint is issued in\nuserspace, we fall through to return 1 from hw_breakpoint_pending()\n\"unhandled fault\" so userspace can make use of this breakpoint.\n\nTested with LKDTM and this command line:\necho CFI_FORWARD_PROTO \u003e /sys/kernel/debug/provoke-crash/DIRECT\nstill works as expected.",
  "id": "GHSA-83wp-8ph8-8m42",
  "modified": "2026-09-17T18:31:59Z",
  "published": "2026-09-17T18:31:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90306"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22107402c2669b0163d43cc68901a2c4a59fa43a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/314f1a6762b5d51b37784ed7dc701d4c3d893703"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ed9bff906cf8036531d1559f10e82733a52b41f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da64b150e4b7bee615b33ab21f3137c31ec36922"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-90306 (GCVE-0-2026-90306)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-21 13:15

Title

ARM: 9481/2: breakpoint: CFI breakpoints only on demand

Summary

In the Linux kernel, the following vulnerability has been resolved: ARM: 9481/2: breakpoint: CFI breakpoints only on demand This removes the stub hw_breakpoint_cfi_handler() from ARM, making it not steal breakpoint type 0x03 (ARM_ENTRY_CFI_BREAKPOINT) unless CFI is actively used in the kernel. When not instrumenting with CFI, or when a breakpoint is issued in userspace, we fall through to return 1 from hw_breakpoint_pending() "unhandled fault" so userspace can make use of this breakpoint. Tested with LKDTM and this command line: echo CFI_FORWARD_PROTO > /sys/kernel/debug/provoke-crash/DIRECT still works as expected.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/314f1a6762b5d51b3…
https://git.kernel.org/stable/c/da64b150e4b7bee61…
https://git.kernel.org/stable/c/8ed9bff906cf80365…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 , < 314f1a6762b5d51b37784ed7dc701d4c3d893703 (git) Affected: c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 , < da64b150e4b7bee615b33ab21f3137c31ec36922 (git) Affected: c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 , < 8ed9bff906cf8036531d1559f10e82733a52b41f (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.18.52 , ≤ 6.18.* (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": [
            "arch/arm/kernel/hw_breakpoint.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "314f1a6762b5d51b37784ed7dc701d4c3d893703",
              "status": "affected",
              "version": "c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3",
              "versionType": "git"
            },
            {
              "lessThan": "da64b150e4b7bee615b33ab21f3137c31ec36922",
              "status": "affected",
              "version": "c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3",
              "versionType": "git"
            },
            {
              "lessThan": "8ed9bff906cf8036531d1559f10e82733a52b41f",
              "status": "affected",
              "version": "c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm/kernel/hw_breakpoint.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "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": "6.18.52",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9481/2: breakpoint: CFI breakpoints only on demand\n\nThis removes the stub hw_breakpoint_cfi_handler() from ARM, making\nit not steal breakpoint type 0x03 (ARM_ENTRY_CFI_BREAKPOINT) unless\nCFI is actively used in the kernel.\n\nWhen not instrumenting with CFI, or when a breakpoint is issued in\nuserspace, we fall through to return 1 from hw_breakpoint_pending()\n\"unhandled fault\" so userspace can make use of this breakpoint.\n\nTested with LKDTM and this command line:\necho CFI_FORWARD_PROTO \u003e /sys/kernel/debug/provoke-crash/DIRECT\nstill works as expected."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-21T13:15:22.727Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/314f1a6762b5d51b37784ed7dc701d4c3d893703"
        },
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          "url": "https://git.kernel.org/stable/c/da64b150e4b7bee615b33ab21f3137c31ec36922"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ed9bff906cf8036531d1559f10e82733a52b41f"
        }
      ],
      "title": "ARM: 9481/2: breakpoint: CFI breakpoints only on demand",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90306",
    "datePublished": "2026-09-17T16:08:28.387Z",
    "dateReserved": "2026-09-11T19:38:34.800Z",
    "dateUpdated": "2026-09-21T13:15:22.727Z",
    "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.

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-83WP-8PH8-8M42

CVE-2026-90306 (GCVE-0-2026-90306)

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