CVE-2026-43226Network attack vector

Network service interruption via stuck RDS shutdown work

Published May 6, 2026 · Updated May 6, 2026

Denial of service in the Linux kernel RDS/TCP multipath implementation allows remote attackers to leave connection shutdown work permanently queued. The rds_tcp_accept_one_path function moves an errored path directly back to RDS_CONN_CONNECTING, after which rds_tcp_reset_callbacks can queue shutdown work while changing it to RDS_CONN_RESETTING, a state rds_conn_init_shutdown rejects. Network reachability to an RDS-over-TCP endpoint with multipath handling is required; the rejected shutdown transition leaves the work flag set and prevents normal connection cleanup.

CVSS severity7.5
High
EPSS probability0.52%
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 RDS/TCP multipath implementation allows remote attackers to leave connection shutdown work permanently queued. The rds_tcp_accept_one_path function moves an errored path directly back to RDS_CONN_CONNECTING, after which rds_tcp_reset_callbacks can queue shutdown work while changing it to RDS_CONN_RESETTING, a state rds_conn_init_shutdown rejects. Network reachability to an RDS-over-TCP endpoint with multipath handling is required; the rejected shutdown transition leaves the work flag set and prevents normal connection cleanup.

The record

CVE
CVE-2026-43226
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <19e384a7d00d888303a8285977cdf1970c6cccd6
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <81248b1eb3c5954cc1fc7b33b7c03e34d20cb8c8
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <899ef00963ce76f9fc421a7d02335fe4ead6389b
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9bcd7c00691a2db9745817d5ea79262a503b135c
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9ff599a9be784a808c36765086e3db2144aa3b66
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a179ac7be8f5a650d0068040705f4cddd6ca369c
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ad22d24be635c6beab6a1fdd3f8b1f3c478d15da
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f0f729bdffb08af32e0f54521b81b8a9e0321f16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <19e384a7d00d888303a8285977cdf1970c6cccd6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <81248b1eb3c5954cc1fc7b33b7c03e34d20cb8c8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <899ef00963ce76f9fc421a7d02335fe4ead6389b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9bcd7c00691a2db9745817d5ea79262a503b135c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9ff599a9be784a808c36765086e3db2144aa3b66; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a179ac7be8f5a650d0068040705f4cddd6ca369c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ad22d24be635c6beab6a1fdd3f8b1f3c478d15da; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f0f729bdffb08af32e0f54521b81b8a9e0321f16

Published CVSS scores

7.5CanonicalCVSS: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

T1499.004Application or System Exploitation

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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