CVE-2026-97551

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

xfs: initialise args->total for parent pointer updates

xfs_parent_da_args_init() builds an xfs_da_args from a zeroed

xfs_parent_args (kmem_cache_zalloc), leaving args->total == 0.

xfs_da_grow_inode_int() treats that field as a running block reservation

and subtracts from it; because it is an xfs_extlen_t (uint32_t), the

first attr-fork growth wraps it to ~0U. That defeats the free-space

check in xfs_alloc_space_available(), and when it coincides with an AG

that has exactly zero available blocks the allocation is clamped to

maxlen 0 and returns -ENOSPC, which xfs_defer_finish_noroll() escalates

to a filesystem shutdown.

Set args->total the way the log recovery path does

(xfs_attri_recover_work(), xfs_attr_item.c:706), in the add and replace

paths that can grow the fork. Removals and lookups never grow it, so

they leave the field alone, matching that switch.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References