SB20260720276 - Improper Check for Unusual or Exceptional Conditions in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-63955)

CWE-ID: CWE-754 - Improper Check for Unusual or 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 interrupt context checks in __get_vm_area_node() when allocating memory through vmalloc() with bottom halves disabled. A local user can trigger a code path that reaches vmalloc() in that context to cause a denial of service.

The issue is triggered by a BUG() condition when bottom halves are disabled, even though execution is not in NMI or hard IRQ context.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/04aa71da5f35aacdc9ae9cb5150947daa624f641
• https://git.kernel.org/stable/c/ad7eff07b625f53c3fb513b30d7a8c5a79fbc7ce