SB2026102281 - Use-after-free in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-98506)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to corrupt kernel memory, potentially causing a denial of service.

The vulnerability exists due to improper folio lifetime management in dissolve_free_hugetlb_folio() in mm/hugetlb.c when dissolving gigantic pages without runtime support. A local user can trigger affected dissolution operations to free a folio that remains on the free list; if vmemmap restoration fails, the add_hugetlb_folio() rollback corrupts that list, potentially causing a kernel crash.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/443628f755b35bf45044f68b970b65cd531c42fd
• https://git.kernel.org/stable/c/a363c62a653cc8b3e21da9545fa4e028ef50f9c3
• https://git.kernel.org/stable/c/ccf96a4b8626a001c13c5836d8357f31c57bbd8e
• https://git.kernel.org/stable/c/ddc1055b557506a6ea8930dfbd8d1555d6a3f01e