{"id":"CVE-2026-98722","title":"mtd: block2mtd: Fix divide error when erase_size is zero","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: block2mtd: Fix divide error when erase_size is zero\n\nThe erase size is parsed from the \"block2mtd\" module parameter and can\nbe set to zero. add_device() then evalu…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= ea6d833a3fddcd1d60414d48f34c7f4fbe88608f < 826170a49ca1315af6b293a02200585b1e2186d9","Linux >= ea6d833a3fddcd1d60414d48f34c7f4fbe88608f < a991c28066e7ba4da7450bb04478849f7ac6a14a","Linux >= ea6d833a3fddcd1d60414d48f34c7f4fbe88608f < 21d0f05989bf0d5cef57b467a7fa4feefbd7236a","Linux >= ea6d833a3fddcd1d60414d48f34c7f4fbe88608f < b5965c4221165045e19736794ca5f48ae3d67142","Linux 3.15"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:46:58.093Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98722","references":[{"url":"https://git.kernel.org/stable/c/826170a49ca1315af6b293a02200585b1e2186d9"},{"url":"https://git.kernel.org/stable/c/a991c28066e7ba4da7450bb04478849f7ac6a14a"},{"url":"https://git.kernel.org/stable/c/21d0f05989bf0d5cef57b467a7fa4feefbd7236a"},{"url":"https://git.kernel.org/stable/c/b5965c4221165045e19736794ca5f48ae3d67142"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.509Z","slug":"CVE-2026-98722","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmtd: block2mtd: Fix divide error when erase_size is zero\n\nThe erase size is parsed from the \"block2mtd\" module parameter and can\nbe set to zero. add_device() then evaluates\n\n        if (size % erase_size)\n\nwith a zero divisor, which triggers a divide error:\n\ndivide error: 0000 [#1] PREEMPT SMP PTI\nRIP: 0010:add_device drivers/mtd/devices/block2mtd.c:296 [inline]\nRIP: 0010:block2mtd_setup2+0x592/0xda0 drivers/mtd/devices/block2mtd.c:459\nCall Trace:\nblock2mtd_setup+0x27/0xe0 drivers/mtd/devices/block2mtd.c:476\nparam_attr_store+0x214/0x310 kernel/params.c:589\nmodule_attr_store+0x65/0x90 kernel/params.c:904\nkernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345\n...\n\nReject a zero erase size before performing the modulo operation so the\nexisting \"erasesize must be a divisor of device size\" error path\nreports the invalid argument and frees the device.\n\n## Affected\n\n- `Linux >= ea6d833a3fddcd1d60414d48f34c7f4fbe88608f < 826170a49ca1315af6b293a02200585b1e2186d9`\n- `Linux >= ea6d833a3fddcd1d60414d48f34c7f4fbe88608f < a991c28066e7ba4da7450bb04478849f7ac6a14a`\n- `Linux >= ea6d833a3fddcd1d60414d48f34c7f4fbe88608f < 21d0f05989bf0d5cef57b467a7fa4feefbd7236a`\n- `Linux >= ea6d833a3fddcd1d60414d48f34c7f4fbe88608f < b5965c4221165045e19736794ca5f48ae3d67142`\n- `Linux 3.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}