SB2026072030 - Improper Check or Handling of Exceptional Conditions in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-64181)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

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.

The vulnerability exists due to improper handling of special page table mappings in __vm_normal_page() when processing huge PMD or PUD mappings on architectures without pmd_special()/pud_special() support. A local user can trigger memory management operations involving huge zero folios to cause a denial of service.

This issue is exposed on x86 32-bit systems with THP enabled.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/62153767e8fc3889bc6508e9ffe927aaf64c4334
• https://git.kernel.org/stable/c/9052ea2ee2233be5d4786b8909151ca2bfbedf99
• https://git.kernel.org/stable/c/c0c6ccd9828c3a1950623b546fa57292a77b5c73