CVE-2026-98722
Received Received - Intake

Divide Error in Linux Kernel MTD block2mtd

Publication date: 2026-10-18

Last updated on: 2026-10-18

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mtd: block2mtd: Fix divide error when erase_size is zero The erase size is parsed from the "block2mtd" module parameter and can be set to zero. add_device() then evaluates if (size % erase_size) with a zero divisor, which triggers a divide error: divide error: 0000 [#1] PREEMPT SMP PTI RIP: 0010:add_device drivers/mtd/devices/block2mtd.c:296 [inline] RIP: 0010:block2mtd_setup2+0x592/0xda0 drivers/mtd/devices/block2mtd.c:459 Call Trace: block2mtd_setup+0x27/0xe0 drivers/mtd/devices/block2mtd.c:476 param_attr_store+0x214/0x310 kernel/params.c:589 module_attr_store+0x65/0x90 kernel/params.c:904 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345 ... Reject a zero erase size before performing the modulo operation so the existing "erasesize must be a divisor of device size" error path reports the invalid argument and frees the device.

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Meta Information

Published
2026-10-18
Last Modified
2026-10-18
Generated
2026-10-18
AI Q&A
2026-10-18
EPSS Evaluated
N/A
NVD
CVE-2026-98722
EUVD
EUVD-2026-103976

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
Linux Linux ea6d833a3fddcd1d60414d48f34c7f4fbe88608f
Linux Linux ea6d833a3fddcd1d60414d48f34c7f4fbe88608f
Linux Linux ea6d833a3fddcd1d60414d48f34c7f4fbe88608f
Linux Linux ea6d833a3fddcd1d60414d48f34c7f4fbe88608f
Linux Linux 3.15

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel occurs in the block2mtd driver when the erase_size parameter is set to zero. The code attempts to perform a division operation using this zero value as a divisor, causing a divide error that crashes the system.

Detection Guidance

This vulnerability can be detected by checking if the block2mtd module is loaded with a zero erase_size parameter. Inspect kernel logs for divide error messages or check module parameters using commands like 'dmesg | grep divide error' or 'cat /sys/module/block2mtd/parameters/erase_size'.

Impact Analysis

This vulnerability can cause a kernel crash (divide error) when the block2mtd module is configured with an erase_size of zero. This leads to a denial of service as the system becomes unresponsive or reboots.

Mitigation Strategies

Immediately unload the block2mtd module if loaded with a zero erase_size parameter using 'rmmod block2mtd'. Ensure the erase_size parameter is set to a non-zero value before loading the module. Update the Linux kernel to a patched version where this issue is resolved.

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