CVE-2026-74282Network attack vector

Connection transmit starvation via oversized TIPC ACK

Published Aug 15, 2026 · Updated Aug 15, 2026

Integer underflow in the Linux kernel TIPC component allows remote attackers to halt a connection's transmissions via an oversized ACK. tipc_sk_conn_proto_rcv subtracts the peer-controlled acknowledgment count from the unsigned snt_unacked counter without checking the outstanding-message count, causing wraparound and permanent congestion. The attacker must establish a TIPC peer connection; the resulting service interruption is confined to that connection's send side.

CVSS severity7.5
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in the Linux kernel TIPC component allows remote attackers to halt a connection's transmissions via an oversized ACK. tipc_sk_conn_proto_rcv subtracts the peer-controlled acknowledgment count from the unsigned snt_unacked counter without checking the outstanding-message count, causing wraparound and permanent congestion. The attacker must establish a TIPC peer connection; the resulting service interruption is confined to that connection's send side.

The record

CVE
CVE-2026-74282
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-191, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=10724cc7bb7832b482df049c20fd824d928c5eaa <1e2c956745777e6ffdee7f30da5935741c03ee1e
  2. Affected versionversion=10724cc7bb7832b482df049c20fd824d928c5eaa <3388145d258cf2c4c98278e3987296007d30672e
  3. Affected versionversion=10724cc7bb7832b482df049c20fd824d928c5eaa <3cfa3d8e0dc167850edeb5bf5a07757db83fd54e
  4. Affected versionversion=10724cc7bb7832b482df049c20fd824d928c5eaa <47ed873e4ceda34098bd46d8e96b4bb13cad3a04
  5. Affected versionversion=10724cc7bb7832b482df049c20fd824d928c5eaa <67e55b054bf8025658dc0e255057f2a6236416bd
  6. Affected versionversion=10724cc7bb7832b482df049c20fd824d928c5eaa <96f91b8ae1a489b3eca137e7acf42cf985fb8939
  7. Affected versionversion=10724cc7bb7832b482df049c20fd824d928c5eaa <ab3e10b44ba5411779aac7afd2477917dd77750f
  8. Affected versionversion=10724cc7bb7832b482df049c20fd824d928c5eaa <b44bebdd32c9ff66ee2aebfc317ced44bedd9335
  9. Affected versionversion=4.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=10724cc7bb7832b482df049c20fd824d928c5eaa <1e2c956745777e6ffdee7f30da5935741c03ee1e; version=10724cc7bb7832b482df049c20fd824d928c5eaa <3388145d258cf2c4c98278e3987296007d30672e; version=10724cc7bb7832b482df049c20fd824d928c5eaa <3cfa3d8e0dc167850edeb5bf5a07757db83fd54e; version=10724cc7bb7832b482df049c20fd824d928c5eaa <47ed873e4ceda34098bd46d8e96b4bb13cad3a04; version=10724cc7bb7832b482df049c20fd824d928c5eaa <67e55b054bf8025658dc0e255057f2a6236416bd; version=10724cc7bb7832b482df049c20fd824d928c5eaa <96f91b8ae1a489b3eca137e7acf42cf985fb8939; version=10724cc7bb7832b482df049c20fd824d928c5eaa <ab3e10b44ba5411779aac7afd2477917dd77750f; version=10724cc7bb7832b482df049c20fd824d928c5eaa <b44bebdd32c9ff66ee2aebfc317ced44bedd9335; version=4.7

Published CVSS scores

7.5Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.3Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499.004Endpoint Denial of Service: Application 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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