CVE-2026-63811

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the f2fs file system during atomic write operations. When updating an atomic-write file, the f2fs write begin() function may incorrectly use a COW (Copy-on-Write) inode to read previously written data. This causes f2fs grab read bio() to determine the decryption requirements based on the COW inode rather than the original inode. Because the data in the COW block is encrypted using the original inode's context, a mismatch occurs if the COW inode inherits a different encryption policy. This leads to a null-pointer dereference in the fscrypt decrypt pagecache blocks() function when it attempts to access the encryption information of the original inode, resulting in a general protection fault.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.