CVE-2026-74282

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-15. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

tipc: prevent snt_unacked underflow on CONN_ACK

tipc_sk_conn_proto_rcv() subtracts the peer-supplied connection ack count from the unsigned 16-bit send counter snt_unacked without checking that it does not exceed the number of messages actually outstanding:

tsk->snt_unacked -= msg_conn_ack(hdr);

msg_conn_ack() is read straight from a received CONN_MANAGER/CONN_ACK message. If the ack count is larger than snt_unacked, the subtraction wraps to a near-maximum value, leaving tsk_conn_cong() permanently true and starving the connection of further transmits.

Validate the ACK count at the start of the CONN_ACK block and drop the message if it acknowledges more messages than are outstanding. A peer (or, for a local connection, the connected peer socket) can otherwise wedge a TIPC connection's send side by sending an oversized connection ack.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (8)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

tipc: prevent snt_unacked underflow on CONN_ACK - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b44bebdd32c9ff66ee2aebfc317ced44bedd9335
generic

tipc: prevent snt_unacked underflow on CONN_ACK - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ab3e10b44ba5411779aac7afd2477917dd77750f
generic

tipc: prevent snt_unacked underflow on CONN_ACK - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/96f91b8ae1a489b3eca137e7acf42cf985fb8939
generic

tipc: prevent snt_unacked underflow on CONN_ACK - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/67e55b054bf8025658dc0e255057f2a6236416bd
generic

tipc: prevent snt_unacked underflow on CONN_ACK - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/47ed873e4ceda34098bd46d8e96b4bb13cad3a04
generic

tipc: prevent snt_unacked underflow on CONN_ACK - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3cfa3d8e0dc167850edeb5bf5a07757db83fd54e
generic

tipc: prevent snt_unacked underflow on CONN_ACK - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3388145d258cf2c4c98278e3987296007d30672e
generic

tipc: prevent snt_unacked underflow on CONN_ACK - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1e2c956745777e6ffdee7f30da5935741c03ee1e

Vendor Advisories for CVE-2026-74282(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 31× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-21 05:56 UTCEG score recompute
  2. 2026-08-21 05:56 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 18:05 UTCGHSA enrichment
  5. 2026-08-20 06:14 UTCGHSA enrichment
  6. 2026-08-19 18:22 UTCEG score recompute
  7. 2026-08-19 18:22 UTCGHSA enrichment
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-19 06:30 UTCGHSA enrichment
  10. 2026-08-18 18:40 UTCEG score recompute
  11. 2026-08-18 18:40 UTCGHSA enrichment
  12. 2026-08-18 13:49 UTCEPSS rescore
  13. 2026-08-18 13:49 UTCEPSS rescore
  14. 2026-08-18 06:49 UTCGHSA enrichment
  15. 2026-08-17 18:58 UTCEG score recompute
  16. 2026-08-17 18:58 UTCGHSA enrichment
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-17 06:22 UTCEG score recompute
  19. 2026-08-17 06:22 UTCGHSA enrichment
  20. 2026-08-17 05:56 UTCEG score recompute▲ 7.50
  21. 2026-08-17 05:56 UTCGHSA enrichment
  22. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  23. 2026-08-17 05:27 UTCEG score recompute
  24. 2026-08-17 05:27 UTCGHSA enrichment
  25. 2026-08-17 05:24 UTCMITRE cvelistV5
Show 6 more
  1. 2026-08-16 14:56 UTCEPSS rescore
  2. 2026-08-16 14:56 UTCEPSS rescore
  3. 2026-08-16 02:15 UTCEPSS rescore
  4. 2026-08-15 06:23 UTCNVD update
  5. 2026-08-15 06:17 UTCEG score recompute
  6. 2026-08-15 06:12 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74282?
CVE-2026-74282 is a high vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: tipc: prevent sntunacked underflow on CONNACK tipcskconnprotorcv() subtracts the peer-supplied connection ack count from the unsigned 16-bit send counter snt_unacked without checking that it does not exceed the number of messages…
When was CVE-2026-74282 disclosed?
CVE-2026-74282 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74282 actively exploited?
CVE-2026-74282 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 50.1% of all scored CVEs.
What is the CVSS score of CVE-2026-74282?
CVE-2026-74282 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-74282?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74282, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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