CVE-2026-98722
Low risk· EPSS 6%Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel's block2mtd module, the erase_size parameter can be set to zero, causing a divide-by-zero in add_device() during the modulo operation. This triggers a kernel divide error and crash.
Risk Assessment
Loading the block2mtd module with a zero erase size causes a kernel oops/panic, potentially leading to denial of service or system instability.
Recommendation
Update the Linux kernel to a version containing the fix that rejects a zero erase size before performing the modulo operation.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

