VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98722: Linux kernel · mtd: block2mtd: Fix divide error when erase_size is zero

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in bff83b723e93acc788bd690dc4bc1f6f4356c35b : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in bff83b723e93acc788bd690dc4bc1f6f4356c35b, b5965c4221165045e19736794ca5f48ae3d67142, a991c28066e7ba4da7450bb04478849f7ac6a14a +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ea6d833a3fddcd1d60414d48f34c7f4fbe88608f, < bff83b723e93acc788bd690dc4bc1f6f4356c35b	Fixed in bff83b723e93acc788bd690dc4bc1f6f4356c35b
LinuxLinux	Affected ≥ ea6d833a3fddcd1d60414d48f34c7f4fbe88608f, < b5965c4221165045e19736794ca5f48ae3d67142	Fixed in b5965c4221165045e19736794ca5f48ae3d67142
LinuxLinux	Affected ≥ ea6d833a3fddcd1d60414d48f34c7f4fbe88608f, < a991c28066e7ba4da7450bb04478849f7ac6a14a	Fixed in a991c28066e7ba4da7450bb04478849f7ac6a14a
LinuxLinux	Affected ≥ ea6d833a3fddcd1d60414d48f34c7f4fbe88608f, < 826170a49ca1315af6b293a02200585b1e2186d9	Fixed in 826170a49ca1315af6b293a02200585b1e2186d9
LinuxLinux	Affected ≥ ea6d833a3fddcd1d60414d48f34c7f4fbe88608f, < 21d0f05989bf0d5cef57b467a7fa4feefbd7236a	Fixed in 21d0f05989bf0d5cef57b467a7fa4feefbd7236a
LinuxLinux	Affected =3.15	Fixed in–

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.

References

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