What’s Vulnerable › Vulnerabilities

CVE-2026-98729: x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h get_align_mask() returns huge_page_mask_align() for hugetlbfs, but get_align_bits() adds va_align.bits regardless, so vm_unmapped_area() returns an address off the huge page boundary and __unmap_hugepage_range() hits BUG_ON(start & ~huge_page_mask(h)) at teardown. This can be triggered on Carrizo and FX-8370E, both hstates. Pass the file to get_align_bits() and skip the randomisation for hugetlbfs. [ bp: Massage commit message. ]

Affected products

• Linux kernel: 6.13 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/b46b2e2de47ca9449532b0a7110ed99f79061d6e
• https://git.kernel.org/stable/c/d2457a7e2727dc747a61a50d65c2f259afce8c45
• https://git.kernel.org/stable/c/fe23680e6f1d52b8cc45d77bf7c54249508a81c7

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