GHSA-XJ5R-4M42-GC82
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In 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. ]
{
"affected": [],
"aliases": [
"CVE-2026-97947"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:22Z",
"severity": null
},
"details": "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": "GHSA-xj5r-4m42-gc82",
"modified": "2026-09-25T12:31:29Z",
"published": "2026-09-25T12:31:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97947"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a797a2331e5d2ecdbccbae222ea71c759fdb2c2b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aefdbd574a362dcf7569bada6d72f64a006b9fb9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fcd19bc829eca237742a3b123f839ad1c473ec85"
}
],
"schema_version": "1.4.0",
"severity": []
}
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