CVE-2025-37896

Kernel crash via zero-dummy-byte cycle calculation

Published May 20, 2025 · Updated May 11, 2026

Divide by zero in Linux kernel 6.14 through 6.14.5 and 6.15-rc1 through 6.15-rc4 allows local users to crash the kernel. spi_mem_calc_op_duration() divides the dummy-bit count by the dummy bus width while deriving ncycles, without skipping the calculation when an operation has zero dummy bytes. The path is reached when compatible SPI-NAND flash exposes write_cache or update_cache variants with no dummy bytes, and the resulting kernel oops interrupts service.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide by zero in Linux kernel 6.14 through 6.14.5 and 6.15-rc1 through 6.15-rc4 allows local users to crash the kernel. spi_mem_calc_op_duration() divides the dummy-bit count by the dummy bus width while deriving ncycles, without skipping the calculation when an operation has zero dummy bytes. The path is reached when compatible SPI-NAND flash exposes write_cache or update_cache variants with no dummy bytes, and the resulting kernel oops interrupts service.

The record

CVE
CVE-2025-37896
Published
May 20, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=226d6cb3cb799aae46d0dd19a521133997d9db11 <1915dbd67dadc0bb35670c8e28229baa29368d17
  2. Affected versionversion=226d6cb3cb799aae46d0dd19a521133997d9db11 <8e4d3d8a5e51e07bd0d6cdd81b5e4af79f796927
  3. Affected versionversion=6.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=226d6cb3cb799aae46d0dd19a521133997d9db11 <1915dbd67dadc0bb35670c8e28229baa29368d17; version=226d6cb3cb799aae46d0dd19a521133997d9db11 <8e4d3d8a5e51e07bd0d6cdd81b5e4af79f796927; version=6.14

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-369Divide By Zero
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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