FKIE_CVE-2026-97947

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 11:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/amd_node: Fix potential NULL pointer dereference amd_smn_read/write() are exported functions around __amd_smn_rw(), so they are always available even if amd_smn_init() fails. In that case, 'amd_roots' is NULL and __amd_smn_rw() will access uninitialized memory. Then, commit: 83518453074d ("x86/amd_node: Add SMN offsets to exclusive region access") added the 'smn_exclusive' flag, which indicated the calls to pci_request_config_region_exclusive() succeeded, to prevent concurrent userspace access. Commit: 0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching") re-ordered initialization so pci_request_config_region_exclusive() is called earlier and a failure exits amd_smn_init() before allocating 'amd_roots'. The setting of 'smn_exclusive' moved to the end of amd_smn_init(), after 'amd_roots' is allocated. It became redundant and can be removed. Replace 'smn_exclusive' with directly checking 'amd_roots', to fix a potential NULL pointer dereference and to simplify the logic. [ bp: Reorg commit message, touchup comment. ] [ mingo: Rebase & further touchups. ]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a797a2331e5d2ecdbccbae222ea71c759fdb2c2b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aefdbd574a362dcf7569bada6d72f64a006b9fb9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fcd19bc829eca237742a3b123f839ad1c473ec85
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/amd_node.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fcd19bc829eca237742a3b123f839ad1c473ec85",
              "status": "affected",
              "version": "77466b798d59d6761501ff36094cf430d3876549",
              "versionType": "git"
            },
            {
              "lessThan": "a797a2331e5d2ecdbccbae222ea71c759fdb2c2b",
              "status": "affected",
              "version": "77466b798d59d6761501ff36094cf430d3876549",
              "versionType": "git"
            },
            {
              "lessThan": "aefdbd574a362dcf7569bada6d72f64a006b9fb9",
              "status": "affected",
              "version": "77466b798d59d6761501ff36094cf430d3876549",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/amd_node.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/amd_node: Fix potential NULL pointer dereference\n\namd_smn_read/write() are exported functions around __amd_smn_rw(), so\nthey are always available even if amd_smn_init() fails. In that case,\n\u0027amd_roots\u0027 is NULL and __amd_smn_rw() will access uninitialized memory.\n\nThen, commit:\n\n  83518453074d (\"x86/amd_node: Add SMN offsets to exclusive region access\")\n\nadded the \u0027smn_exclusive\u0027 flag, which indicated the calls to\npci_request_config_region_exclusive() succeeded, to prevent\nconcurrent userspace access.\n\nCommit:\n\n  0a4b61d9c2e4 (\"x86/amd_node: Fix AMD root device caching\")\n\nre-ordered initialization so pci_request_config_region_exclusive() is\ncalled earlier and a failure exits amd_smn_init() before allocating\n\u0027amd_roots\u0027. The setting of \u0027smn_exclusive\u0027 moved to the end of\namd_smn_init(), after \u0027amd_roots\u0027 is allocated. It became redundant\nand can be removed.\n\nReplace \u0027smn_exclusive\u0027 with directly checking \u0027amd_roots\u0027, to fix a\npotential NULL pointer dereference and to simplify the logic.\n\n  [ bp: Reorg commit message, touchup comment. ]\n  [ mingo: Rebase \u0026 further touchups. ]"
    }
  ],
  "id": "CVE-2026-97947",
  "lastModified": "2026-09-25T11:17:22.213",
  "metrics": {},
  "published": "2026-09-25T11:17:22.213",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a797a2331e5d2ecdbccbae222ea71c759fdb2c2b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aefdbd574a362dcf7569bada6d72f64a006b9fb9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fcd19bc829eca237742a3b123f839ad1c473ec85"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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