UnratedFix available

x86/fred: Correct speculative safety in fred_extint()

Type: advisorySources: OSV

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.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.12.77, 6.18.17, 6.19.7
CVEs: CVE-2026-23354
Confirmed fixed CVEs: Not specified
Updated in this feed: 5 Nov 2026, 10:39 UTC · Revision 1

Source evidence

x86/fred: Correct speculative safety in fred_extint()

core-osv · Original source

Published 25 Mar 2026, 10:27 UTC

osv:CVE-2026-23354

Kernel

Fixed versions: 6.12.77, 6.18.17, 6.19.7

Complete source record

{
  "id": "e84ab56b98b275c6f3a720953983e8ccb666155fd50f8a42e557284f8533e6ed",
  "url": "https://osv.dev/vulnerability/CVE-2026-23354",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-23354",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.77",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.17",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-23354",
      "aliases": [
        "CVE-2026-23354"
      ],
      "affected": [
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          "ranges": [
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              "type": "GIT",
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                {
                  "fixed": "e58f1a9b0677de24dcfee0b21393446ec92ff120"
                },
                {
                  "fixed": "92caa5274b99cb6729177232a029ce0dfa6c5f7b"
                },
                {
                  "fixed": "aa280a08e7d8fae58557acc345b36b3dc329d595"
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              ]
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          ],
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          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
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                  "fixed": "6.12.77"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.17"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23354.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.822710874Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643",
        "https://git.kernel.org/stable/c/92caa5274b99cb6729177232a029ce0dfa6c5f7b",
        "https://git.kernel.org/stable/c/aa280a08e7d8fae58557acc345b36b3dc329d595",
        "https://git.kernel.org/stable/c/e58f1a9b0677de24dcfee0b21393446ec92ff120",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23354.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23354",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23354.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23354",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 511653,
  "published_at": "2026-03-25T10:27:38.825+00:00"
}