CVE-2026-97947

Status: UPDATED  |  Advisory ID: CVE-2026-97947

Key Details

Affected Products, Subsystems & Sectors

What to Know

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. ] (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References