SB20261022335 - Reachable assertion in Linux kernel x86 kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Reachable assertion (CVE-ID: CVE-2026-98729)

CWE-ID: CWE-617 - Reachable Assertion

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service by triggering a kernel assertion failure.

The vulnerability exists due to incorrect virtual address alignment in the Linux kernel's x86 huge page mapping code when applying va_align.bits to hugetlbfs mappings. A local user can trigger the creation and teardown of a misaligned huge page mapping to cause a denial of service through the BUG_ON assertion in __unmap_hugepage_range().

The issue can be triggered on Carrizo and FX-8370E processors with both huge page size states.

Remediation

Install update from vendor's website.

References

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