CVE-2026-98634scsi: sd_zbc: Reject disks with too many zones

Official description

In the Linux kernel, the following vulnerability has been resolved: scsi: sd_zbc: Reject disks with too many zones sd_zbc_read_zones() computes the number of zones with 64-bit arithmetic and stores the result in the unsigned int nr_zones field of struct zoned_disk_info, silently truncating counts that exceed 32 bits. The truncated count is later used to size per-zone resources, while the device may still report more zones than fit. Moreover, sd_zbc_report_zones() counts the reported zones with a signed int zone_idx, which overflows past INT_MAX. Reject devices reporting more than INT_MAX zones at scan time; such a device is not realistic for any medium that exists today, and accepting it produces inconsistent zone bookkeeping.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/d8791ae55d85dfaeafa20ea48365482a0cc5a107
• https://git.kernel.org/stable/c/0af16d8be3ec7ff28bb56a0da79c9aed66ac2c3b
• https://git.kernel.org/stable/c/3ddf8383b54456f19fd73d3cebed81bd250c7388
• https://git.kernel.org/stable/c/b6ec0f79745967c751c85df373062c8d15e45fc4