CVE-2026-43469Network attack vector

Remote service hang via leaked receive counter

Published May 8, 2026 · Updated May 8, 2026

Denial of service in the Linux Kernel xprtrdma transport allows remote attackers to hang transport shutdown during memory pressure. The rpcrdma_post_recvs() early-return paths fail to decrement ep->re_receiving after receive work-request creation fails, so rpcrdma_xprt_drain() waits for a completion that never occurs. Reachability requires RPC-over-RDMA activity and an early receive-posting exit, such as an allocation failure under high memory pressure; the bounded result is a hung transport-drain worker.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux Kernel xprtrdma transport allows remote attackers to hang transport shutdown during memory pressure. The rpcrdma_post_recvs() early-return paths fail to decrement ep->re_receiving after receive work-request creation fails, so rpcrdma_xprt_drain() waits for a completion that never occurs. Reachability requires RPC-over-RDMA activity and an early receive-posting exit, such as an allocation failure under high memory pressure; the bounded result is a hung transport-drain worker.

The record

CVE
CVE-2026-43469
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=15788d1d1077ebe029c48842c738876516d85076 <49f53ee4e25297d886f14e31f355ad1c2735ddfb
  2. Affected versionversion=15788d1d1077ebe029c48842c738876516d85076 <74c39a47856bddcde7874f2196a00143b5cd0af9
  3. Affected versionversion=15788d1d1077ebe029c48842c738876516d85076 <7b6275c80a0c81c5f8943272292dfe67730ce849
  4. Affected versionversion=15788d1d1077ebe029c48842c738876516d85076 <7ea69259a60a364f56cf4aa9e2eafb588d1c762b
  5. Affected versionversion=15788d1d1077ebe029c48842c738876516d85076 <8127b5fec04757c2a41ed65bca0b3266968efd3b
  6. Affected versionversion=15788d1d1077ebe029c48842c738876516d85076 <8cb6b5d8296b1f99a8d36849901ebabfe3f749db
  7. Affected versionversion=15788d1d1077ebe029c48842c738876516d85076 <dc3ebd7e2d73dbd4d317785735ffa6c4a6384ddf
  8. Affected versionversion=5.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=15788d1d1077ebe029c48842c738876516d85076 <49f53ee4e25297d886f14e31f355ad1c2735ddfb; version=15788d1d1077ebe029c48842c738876516d85076 <74c39a47856bddcde7874f2196a00143b5cd0af9; version=15788d1d1077ebe029c48842c738876516d85076 <7b6275c80a0c81c5f8943272292dfe67730ce849; version=15788d1d1077ebe029c48842c738876516d85076 <7ea69259a60a364f56cf4aa9e2eafb588d1c762b; version=15788d1d1077ebe029c48842c738876516d85076 <8127b5fec04757c2a41ed65bca0b3266968efd3b; version=15788d1d1077ebe029c48842c738876516d85076 <8cb6b5d8296b1f99a8d36849901ebabfe3f749db; version=15788d1d1077ebe029c48842c738876516d85076 <dc3ebd7e2d73dbd4d317785735ffa6c4a6384ddf; version=5.13

Published CVSS scores

7.5Linux Kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/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

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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