SB2026102217 - Out-of-bounds write in Linux kernel xfs libxfs

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-98447)

CWE-ID: CWE-787 - Out-of-bounds write

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 corrupt kernel memory, potentially causing a denial of service.

The vulnerability exists due to an out-of-bounds write in the XFS xfs_rtrefcountbt_from_disk() and xfs_rtrefcountbt_to_disk() functions when converting realtime refcount btree roots between on-disk and in-memory formats. A local user can trigger root formatting operations that copy twice the required key data to corrupt memory beyond the destination buffer, potentially causing a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2703b954d306ebfe3b11e33e259759329c11b690
• https://git.kernel.org/stable/c/d46492fb8018d12d00651b06b9d240e747110b38
• https://git.kernel.org/stable/c/fe2f9135df43db849e74f03956d322ac20b59af7