CVE-2026-97947 (GCVE-0-2026-97947)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:22 – Updated: 2026-10-19 09:11
VLAI
Title
x86/amd_node: Fix potential NULL pointer dereference
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. ]
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 77466b798d59d6761501ff36094cf430d3876549 , < fcd19bc829eca237742a3b123f839ad1c473ec85 (git)
Affected: 77466b798d59d6761501ff36094cf430d3876549 , < a797a2331e5d2ecdbccbae222ea71c759fdb2c2b (git)
Affected: 77466b798d59d6761501ff36094cf430d3876549 , < aefdbd574a362dcf7569bada6d72f64a006b9fb9 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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          "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. ]"
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    "datePublished": "2026-09-25T10:22:57.163Z",
    "dateReserved": "2026-09-25T10:18:58.204Z",
    "dateUpdated": "2026-10-19T09:11:13.582Z",
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        "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": "2026-10-19T10:17:45.937",
        "metrics": {},
        "published": "2026-09-25T11:17:22.213",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-97947.json",
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}



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