CVE-2022-49670Network attack vector

Kernel crash via zero RDMA DIM ratio

Published Feb 26, 2025 · Updated Aug 5, 2026

Divide-by-zero in affected Linux kernel 5.3 through 5.19-rc4 branches allows attackers to crash the host during RDMA DIM processing. The rdma_dim_stats_compare() function divides a CPE-ratio delta by prev->cpe_ratio without first rejecting a zero prior ratio. Reachability requires an RDMA completion path using dynamic interrupt moderation; the resulting exception can oops or panic the kernel.

CVSS severity7.5
High
EPSS probability0.72%
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 affected Linux kernel 5.3 through 5.19-rc4 branches allows attackers to crash the host during RDMA DIM processing. The rdma_dim_stats_compare() function divides a CPE-ratio delta by prev->cpe_ratio without first rejecting a zero prior ratio. Reachability requires an RDMA completion path using dynamic interrupt moderation; the resulting exception can oops or panic the kernel.

The record

CVE
CVE-2022-49670
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.3
  2. Affected versionversion=f4915455dcf07c4f237d6160a4b6adb0575d2909 <0b6e0eb5c45e79e9095de2498cc0ca5ec563fc5e
  3. Affected versionversion=f4915455dcf07c4f237d6160a4b6adb0575d2909 <0fe3dbbefb74a8575f61d7801b08dbc50523d60d
  4. Affected versionversion=f4915455dcf07c4f237d6160a4b6adb0575d2909 <5af106f8e072aebd88b95e164a08fa320651a99a
  5. Affected versionversion=f4915455dcf07c4f237d6160a4b6adb0575d2909 <7c1963391af51ee322378d1b2849c60e9037f069
  6. Affected versionversion=f4915455dcf07c4f237d6160a4b6adb0575d2909 <fae2a9fb1eaf348ad8732f90d42ebbb971bd7e95

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=f4915455dcf07c4f237d6160a4b6adb0575d2909 <0b6e0eb5c45e79e9095de2498cc0ca5ec563fc5e; version=f4915455dcf07c4f237d6160a4b6adb0575d2909 <0fe3dbbefb74a8575f61d7801b08dbc50523d60d; version=f4915455dcf07c4f237d6160a4b6adb0575d2909 <5af106f8e072aebd88b95e164a08fa320651a99a; version=f4915455dcf07c4f237d6160a4b6adb0575d2909 <7c1963391af51ee322378d1b2849c60e9037f069; version=f4915455dcf07c4f237d6160a4b6adb0575d2909 <fae2a9fb1eaf348ad8732f90d42ebbb971bd7e95

Published CVSS scores

7.5LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS: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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
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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