CVE-2026-72436

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: 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:

netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types

Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases

  • protected by region lock
  • in a set destroy phase
  • in a new/temporary set creation phase

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (6)

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

netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e
generic

netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b
generic

netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710
generic

netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7
generic

netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0
generic

netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd

Vendor Advisories for CVE-2026-72436(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 43× in last 7d / 43× 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. 2026-08-20 14:16 UTCGHSA enrichment
  2. 2026-08-20 10:20 UTCGHSA enrichment
  3. 2026-08-20 06:24 UTCGHSA enrichment
  4. 2026-08-20 02:28 UTCGHSA enrichment
  5. 2026-08-19 22:32 UTCGHSA enrichment
  6. 2026-08-19 18:35 UTCEG score recompute
  7. 2026-08-19 18:35 UTCGHSA enrichment
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-19 14:38 UTCGHSA enrichment
  10. 2026-08-19 10:42 UTCGHSA enrichment
  11. 2026-08-19 06:46 UTCGHSA enrichment
  12. 2026-08-19 02:48 UTCGHSA enrichment
  13. 2026-08-18 22:50 UTCGHSA enrichment
  14. 2026-08-18 18:54 UTCGHSA enrichment
  15. 2026-08-18 14:58 UTCEG score recompute
  16. 2026-08-18 14:58 UTCGHSA enrichment
  17. 2026-08-18 13:49 UTCEPSS rescore
  18. 2026-08-18 13:49 UTCEPSS rescore
  19. 2026-08-18 10:46 UTCGHSA enrichment
  20. 2026-08-18 06:49 UTCGHSA enrichment
  21. 2026-08-18 02:51 UTCGHSA enrichment
  22. 2026-08-17 22:55 UTCGHSA enrichment
  23. 2026-08-17 18:59 UTCGHSA enrichment
  24. 2026-08-17 14:20 UTCEG score recompute
  25. 2026-08-17 14:20 UTCGHSA enrichment
Show 18 more
  1. 2026-08-17 13:47 UTCEPSS rescore
  2. 2026-08-17 10:24 UTCEG score recompute
  3. 2026-08-17 10:24 UTCGHSA enrichment
  4. 2026-08-17 06:28 UTCEG score recompute
  5. 2026-08-17 06:28 UTCGHSA enrichment
  6. 2026-08-17 05:57 UTCEG score recompute▲ 9.80
  7. 2026-08-17 05:57 UTCGHSA enrichment
  8. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  9. 2026-08-17 05:28 UTCEG score recompute
  10. 2026-08-17 05:28 UTCGHSA enrichment
  11. 2026-08-17 05:24 UTCMITRE cvelistV5
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 02:15 UTCEPSS rescore
  15. 2026-08-15 06:33 UTCGHSA enrichment
  16. 2026-08-15 06:23 UTCNVD update
  17. 2026-08-15 06:04 UTCEG score recompute
  18. 2026-08-15 06:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-72436?
CVE-2026-72436 is a critical vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier…
When was CVE-2026-72436 disclosed?
CVE-2026-72436 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-2026-72436 actively exploited?
CVE-2026-72436 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 49.2% of all scored CVEs.
What is the CVSS score of CVE-2026-72436?
CVE-2026-72436 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-72436?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72436, 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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