CVE-2026-98727: nvme-multipath: set BLK_FEAT_ZONED only after the zone info is known
In the Linux kernel, the following vulnerability has been resolved:
nvme-multipath: set BLKFEATZONED only after the zone info is known
The namespace head is marked zoned at allocation time based only on the command set identifier. If the zone info query reports a zero zone size, the path namespace is registered without zoned limits while the head still advertises the zoned capability with a zone size of zero, and reporting zones or writing to the head then shifts by ilog2(0).
Drop the zoned feature from the head allocation and let the head limits refresh stack it in from the path namespace instead.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Do not mark the namespace head as zoned at allocation time based only on the command set identifier; set BLK_FEAT_ZONED only after zone information is known, and refresh the head limits from the path namespace.
nvme-multipath BLK_FEAT_ZONED = set only after zone info is known