CVE-2026-98252

Kernel warning via premature RDMA request publication

Published Oct 6, 2026 · Updated Oct 6, 2026

A reference-count race in Linux's iWARP port-mapper code allows attackers to trigger a kernel warning during concurrent RDMA netlink requests. The iwpm_get_nlmsg_request() function adds a request to a shared list before initializing its reference count and other fields, allowing another CPU to access the incomplete request and increment a zero count. The observed trigger used a local netlink send path; the public report demonstrates a refcount warning, not a reliable kernel crash or remote exploit.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A reference-count race in Linux's iWARP port-mapper code allows attackers to trigger a kernel warning during concurrent RDMA netlink requests. The iwpm_get_nlmsg_request() function adds a request to a shared list before initializing its reference count and other fields, allowing another CPU to access the incomplete request and increment a zero count. The observed trigger used a local netlink send path; the public report demonstrates a refcount warning, not a reliable kernel crash or remote exploit.

The record

CVE
CVE-2026-98252
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=30dc5e63d6a5ad24894b5512d10b228d73645a44 <117871cdb8927542abd7b65ce5995bf0265a8c05
  2. Affected versionversion=30dc5e63d6a5ad24894b5512d10b228d73645a44 <2fbac8a56004b6ce54fbfe845d4b25da6e0b55e8
  3. Affected versionversion=30dc5e63d6a5ad24894b5512d10b228d73645a44 <33fb59da49c4c3f5c2ec9f9d4447a56857a02c02
  4. Affected versionversion=30dc5e63d6a5ad24894b5512d10b228d73645a44 <52c13c63bb3662c108244e7447055e30bf40244e
  5. Affected versionversion=30dc5e63d6a5ad24894b5512d10b228d73645a44 <88e429a4e9bac3d2138011c5ca06254331f2587f
  6. Affected versionversion=30dc5e63d6a5ad24894b5512d10b228d73645a44 <8a91609032d47e77bcb37bc8f6e88d89340d2709
  7. Affected versionversion=30dc5e63d6a5ad24894b5512d10b228d73645a44 <ce8a379598bd4058081416abea4279fd05a95374
  8. Affected versionversion=30dc5e63d6a5ad24894b5512d10b228d73645a44 <e15eb536be4f646ce683d2867572b2200be877f7
  9. Affected versionversion=3.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=30dc5e63d6a5ad24894b5512d10b228d73645a44 <117871cdb8927542abd7b65ce5995bf0265a8c05; version=30dc5e63d6a5ad24894b5512d10b228d73645a44 <2fbac8a56004b6ce54fbfe845d4b25da6e0b55e8; version=30dc5e63d6a5ad24894b5512d10b228d73645a44 <33fb59da49c4c3f5c2ec9f9d4447a56857a02c02; version=30dc5e63d6a5ad24894b5512d10b228d73645a44 <52c13c63bb3662c108244e7447055e30bf40244e; version=30dc5e63d6a5ad24894b5512d10b228d73645a44 <88e429a4e9bac3d2138011c5ca06254331f2587f; version=30dc5e63d6a5ad24894b5512d10b228d73645a44 <8a91609032d47e77bcb37bc8f6e88d89340d2709; version=30dc5e63d6a5ad24894b5512d10b228d73645a44 <ce8a379598bd4058081416abea4279fd05a95374; version=30dc5e63d6a5ad24894b5512d10b228d73645a44 <e15eb536be4f646ce683d2867572b2200be877f7; version=3.16

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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