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CVE-2026-98729

Linux: x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 5% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version yet
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version.

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. ]

Text from CVE List

Affected versions 8

  • Linuxaffected: 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0 before fe23680e6f1d52b8cc45d77bf7c54249508a81c7CVE List
  • Linuxaffected: 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0 before b46b2e2de47ca9449532b0a7110ed99f79061d6eCVE List
  • Linuxaffected: 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0 before d2457a7e2727dc747a61a50d65c2f259afce8c45CVE List
  • Linuxaffected: 6.13CVE List
  • Linuxunaffected: all versions before 6.13CVE List
  • Linuxunaffected: 6.18.56 through 6.18.*CVE List
  • Linuxunaffected: 7.2.10 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 3