SB20261007112 - Improper Check for Unusual or Exceptional Conditions in Linux kernel fs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-98259)

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 checking of zero or empty xarray entries in the Linux kernel DAX functions dax_associate_entry(), dax_disassociate_entry(), and dax_busy_page() when converting entries to folios. A local user can trigger conversion of a zero or empty entry to cause a denial of service.

The reported failure occurs while booting a virtual machine with DAX-enabled storage.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/185cd2f5fe1e3319853cf065905b2885ad0bcbf8
• https://git.kernel.org/stable/c/44ab7420ab52ab6c04bf225cac7c5c007cedd6c7
• https://git.kernel.org/stable/c/8e2b8614039853e68d5338e37821e8bcee9fc05f