x86/amd_node: Fix potential NULL pointer dereference

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97947
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:22 UTC
Updated2026-09-25 11:17:22 UTC
DescriptionIn 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. ]

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.085940000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 77466b798d59d6761501ff36094cf430d3876549 fcd19bc829eca237742a3b123f839ad1c473ec85 git Not specified
CNA Linux Linux affected 77466b798d59d6761501ff36094cf430d3876549 a797a2331e5d2ecdbccbae222ea71c759fdb2c2b git Not specified
CNA Linux Linux affected 77466b798d59d6761501ff36094cf430d3876549 aefdbd574a362dcf7569bada6d72f64a006b9fb9 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fcd19bc829eca237742a3b123f839ad1c473ec85 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aefdbd574a362dcf7569bada6d72f64a006b9fb9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a797a2331e5d2ecdbccbae222ea71c759fdb2c2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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