SB2026072119 - Improper input validation in Linux kernel f2fs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-63819)

CWE-ID: CWE-20 - Improper input validation

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 input validation in f2fs_get_node_folio_ra() when processing a corrupted f2fs inode during filesystem mount and inode truncation. A local user can supply a crafted corrupted f2fs image to trigger a kernel panic and cause a denial of service.

The issue is triggered by an inconsistent node chain in the inode mapping table where a direct node has the same ino and nid in its footer, leading to a bug check in f2fs_do_truncate_blocks().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0cc21c1ffe15b4156b0bf744f32fd1faef0b7c73
• https://git.kernel.org/stable/c/406c28af75123432d38cf9bbaa6f1476f7b14770
• https://git.kernel.org/stable/c/8712353ed80f87271d732297567dcdbe4b84e8c7