CVE-2026-64187

/// Technical description

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

xfs: fail recovery on a committed log item with no regions

If the first op of a transaction is a bare transaction header

(len == sizeof(struct xfs_trans_header)), xlog_recover_add_to_trans()

adds an item but no region, leaving it on r_itemq with ri_cnt == 0 and

ri_buf == NULL.

The header can be split across op records, so later ops may still add

regions; the item is only invalid if the transaction commits with none.

The runtime commit path never emits such a transaction, so this only

happens on a crafted log. It came from an AI-assisted code audit of the

recovery parser.

xlog_recover_reorder_trans() calls ITEM_TYPE() on the item, which reads

*(unsigned short *)item->ri_buf[0].iov_base and faults on the NULL

ri_buf. Reject it there, before the commit handlers that also read

ri_buf[0].

KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]

RIP: 0010:xlog_recover_reorder_trans (fs/xfs/xfs_log_reco

/// 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