CVE-2026-98354

Service interruption via RDMA MAD receive-buffer leak

Published Oct 6, 2026 · Updated Oct 6, 2026

Memory exhaustion in the RDMA MAD receive path of affected Linux kernels allows remote attackers to disrupt service by repeatedly sending MADs with a wrong PKey. ib_mad_complete_recv() checks the PKey before linking recv_buf to rmpp_list, so its error-path cleanup traverses an empty list and leaves each receive buffer allocated. Exploitation requires a node able to send MADs to an affected RDMA port; repeated failures consume kernel memory rather than directly reading or changing data.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory exhaustion in the RDMA MAD receive path of affected Linux kernels allows remote attackers to disrupt service by repeatedly sending MADs with a wrong PKey. ib_mad_complete_recv() checks the PKey before linking recv_buf to rmpp_list, so its error-path cleanup traverses an empty list and leaves each receive buffer allocated. Exploitation requires a node able to send MADs to an affected RDMA port; repeated failures consume kernel memory rather than directly reading or changing data.

The record

CVE
CVE-2026-98354
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.001
Attack vector
adjacent
Privileges
unauthenticated

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=4.13
  2. Affected versionversion=47a2b338fe63200d716d2e24131cdb49f17c77da <3476c28c9addfa253f505e6bd87f1f5598b961d0
  3. Affected versionversion=47a2b338fe63200d716d2e24131cdb49f17c77da <39c4ea72a40503e102ae07e6776005f96ca078a6
  4. Affected versionversion=47a2b338fe63200d716d2e24131cdb49f17c77da <4617c9a856188674dddb0ca66979746d07688579
  5. Affected versionversion=47a2b338fe63200d716d2e24131cdb49f17c77da <5091e25ec503f7fc02723ca435226467b68caac7
  6. Affected versionversion=47a2b338fe63200d716d2e24131cdb49f17c77da <752b30e9d339008e5ce7eed412e9446078916129
  7. Affected versionversion=47a2b338fe63200d716d2e24131cdb49f17c77da <8e2036fb47a5b152d53eadbd35abf311bd34cc7f
  8. Affected versionversion=47a2b338fe63200d716d2e24131cdb49f17c77da <bad289e42f512646a988f278f536d21547df73f1
  9. Affected versionversion=47a2b338fe63200d716d2e24131cdb49f17c77da <c0d8df85db146d6275e226cb950023be69dd6c77

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.13; version=47a2b338fe63200d716d2e24131cdb49f17c77da <3476c28c9addfa253f505e6bd87f1f5598b961d0; version=47a2b338fe63200d716d2e24131cdb49f17c77da <39c4ea72a40503e102ae07e6776005f96ca078a6; version=47a2b338fe63200d716d2e24131cdb49f17c77da <4617c9a856188674dddb0ca66979746d07688579; version=47a2b338fe63200d716d2e24131cdb49f17c77da <5091e25ec503f7fc02723ca435226467b68caac7; version=47a2b338fe63200d716d2e24131cdb49f17c77da <752b30e9d339008e5ce7eed412e9446078916129; version=47a2b338fe63200d716d2e24131cdb49f17c77da <8e2036fb47a5b152d53eadbd35abf311bd34cc7f; version=47a2b338fe63200d716d2e24131cdb49f17c77da <bad289e42f512646a988f278f536d21547df73f1; version=47a2b338fe63200d716d2e24131cdb49f17c77da <c0d8df85db146d6275e226cb950023be69dd6c77

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.

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

No observations available

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

Weakness, pattern, technique

T1499.001Endpoint Denial of Service: OS Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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