Vulnerability-Lookup

GHSA-4JGP-JCCM-6PPX

Vulnerability from github – Published: 2026-03-25 12:30 – Updated: 2026-03-25 12:30

Details

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

x86/fred: Correct speculative safety in fred_extint()

array_index_nospec() is no use if the result gets spilled to the stack, as it makes the believed safe-under-speculation value subject to memory predictions.

For all practical purposes, this means array_index_nospec() must be used in the expression that accesses the array.

As the code currently stands, it's the wrong side of irqentry_enter(), and 'index' is put into %ebp across the function call.

Remove the index variable and reposition array_index_nospec(), so it's calculated immediately before the array access.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23354"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-25T11:16:33Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/fred: Correct speculative safety in fred_extint()\n\narray_index_nospec() is no use if the result gets spilled to the stack, as\nit makes the believed safe-under-speculation value subject to memory\npredictions.\n\nFor all practical purposes, this means array_index_nospec() must be used in\nthe expression that accesses the array.\n\nAs the code currently stands, it\u0027s the wrong side of irqentry_enter(), and\n\u0027index\u0027 is put into %ebp across the function call.\n\nRemove the index variable and reposition array_index_nospec(), so it\u0027s\ncalculated immediately before the array access.",
  "id": "GHSA-4jgp-jccm-6ppx",
  "modified": "2026-03-25T12:30:23Z",
  "published": "2026-03-25T12:30:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23354"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92caa5274b99cb6729177232a029ce0dfa6c5f7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa280a08e7d8fae58557acc345b36b3dc329d595"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e58f1a9b0677de24dcfee0b21393446ec92ff120"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-23354 (GCVE-0-2026-23354)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-03-25 10:27

Title

x86/fred: Correct speculative safety in fred_extint()

Summary

In the Linux kernel, the following vulnerability has been resolved: x86/fred: Correct speculative safety in fred_extint() array_index_nospec() is no use if the result gets spilled to the stack, as it makes the believed safe-under-speculation value subject to memory predictions. For all practical purposes, this means array_index_nospec() must be used in the expression that accesses the array. As the code currently stands, it's the wrong side of irqentry_enter(), and 'index' is put into %ebp across the function call. Remove the index variable and reposition array_index_nospec(), so it's calculated immediately before the array access.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/3bc5887b0a2b06d2d…
	https://git.kernel.org/stable/c/e58f1a9b0677de24d…
	https://git.kernel.org/stable/c/92caa5274b99cb672…
	https://git.kernel.org/stable/c/aa280a08e7d8fae58…

Impacted products

Vendor

Product

Version

Linux

Affected: 14619d912b658ecd9573fb88400d3830a29cadcb , < 3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643 (git)
Affected: 14619d912b658ecd9573fb88400d3830a29cadcb , < e58f1a9b0677de24dcfee0b21393446ec92ff120 (git)
Affected: 14619d912b658ecd9573fb88400d3830a29cadcb , < 92caa5274b99cb6729177232a029ce0dfa6c5f7b (git)
Affected: 14619d912b658ecd9573fb88400d3830a29cadcb , < aa280a08e7d8fae58557acc345b36b3dc329d595 (git)

Linux

Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/entry/entry_fred.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643",
              "status": "affected",
              "version": "14619d912b658ecd9573fb88400d3830a29cadcb",
              "versionType": "git"
            },
            {
              "lessThan": "e58f1a9b0677de24dcfee0b21393446ec92ff120",
              "status": "affected",
              "version": "14619d912b658ecd9573fb88400d3830a29cadcb",
              "versionType": "git"
            },
            {
              "lessThan": "92caa5274b99cb6729177232a029ce0dfa6c5f7b",
              "status": "affected",
              "version": "14619d912b658ecd9573fb88400d3830a29cadcb",
              "versionType": "git"
            },
            {
              "lessThan": "aa280a08e7d8fae58557acc345b36b3dc329d595",
              "status": "affected",
              "version": "14619d912b658ecd9573fb88400d3830a29cadcb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/entry/entry_fred.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.77",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.77",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.17",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.7",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0-rc2",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/fred: Correct speculative safety in fred_extint()\n\narray_index_nospec() is no use if the result gets spilled to the stack, as\nit makes the believed safe-under-speculation value subject to memory\npredictions.\n\nFor all practical purposes, this means array_index_nospec() must be used in\nthe expression that accesses the array.\n\nAs the code currently stands, it\u0027s the wrong side of irqentry_enter(), and\n\u0027index\u0027 is put into %ebp across the function call.\n\nRemove the index variable and reposition array_index_nospec(), so it\u0027s\ncalculated immediately before the array access."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T10:27:38.825Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643"
        },
        {
          "url": "https://git.kernel.org/stable/c/e58f1a9b0677de24dcfee0b21393446ec92ff120"
        },
        {
          "url": "https://git.kernel.org/stable/c/92caa5274b99cb6729177232a029ce0dfa6c5f7b"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa280a08e7d8fae58557acc345b36b3dc329d595"
        }
      ],
      "title": "x86/fred: Correct speculative safety in fred_extint()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23354",
    "datePublished": "2026-03-25T10:27:38.825Z",
    "dateReserved": "2026-01-13T15:37:46.000Z",
    "dateUpdated": "2026-03-25T10:27:38.825Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-4JGP-JCCM-6PPX

CVE-2026-23354 (GCVE-0-2026-23354)

Tags

Sightings

Nomenclature