CVE-2026-74533

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-15. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: 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:

Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero

hci_conn::iso_data is accessed and modified without lock or RCU. This leads to a race

[Task hdev->workqueue] [Task 2] iso_recv iso_conn_put(conn) conn = LOAD hcon->iso_data iso_conn_free(conn) iso_conn_hold_unless_zero(conn) hcon->iso_data = NULL kfree(conn) kref_get_unless_zero(&conn->ref) /* UAF */

and also to races in iso_conn_add() vs. iso_conn_free().

Fix by adding spinlock hci_conn::proto_lock and using it to guard hci_conn::iso_data.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (2)

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

Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c
generic

Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/876a3e94c70d0859d1dad1c986112d4f0d99eba8

Vendor Advisories for CVE-2026-74533(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 28× in last 7d / 28× 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 05:03 UTCGHSA enrichment
  2. 2026-08-20 17:29 UTCGHSA enrichment
  3. 2026-08-20 05:56 UTCGHSA enrichment
  4. 2026-08-19 18:22 UTCEG score recompute
  5. 2026-08-19 18:22 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 05:39 UTCGHSA enrichment
  8. 2026-08-18 18:05 UTCEG score recompute
  9. 2026-08-18 18:05 UTCGHSA enrichment
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 13:49 UTCEPSS rescore
  12. 2026-08-18 06:28 UTCGHSA enrichment
  13. 2026-08-17 18:54 UTCEG score recompute
  14. 2026-08-17 18:54 UTCGHSA enrichment
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-17 06:24 UTCEG score recompute
  17. 2026-08-17 06:24 UTCGHSA enrichment
  18. 2026-08-17 05:54 UTCEG score recompute▲ 8.80
  19. 2026-08-17 05:54 UTCGHSA enrichment
  20. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  21. 2026-08-17 05:39 UTCEG score recompute
  22. 2026-08-17 05:39 UTCGHSA enrichment
  23. 2026-08-17 05:39 UTCMITRE cvelistV5
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 14:56 UTCEPSS rescore
Show 3 more
  1. 2026-08-15 13:27 UTCNVD update
  2. 2026-08-15 12:39 UTCEG score recompute
  3. 2026-08-15 12:37 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74533?
CVE-2026-74533 is a high vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix race of kfree vs krefgetunless_zero hciconn::isodata is accessed and modified without lock or RCU. This leads to a race [Task hdev->workqueue] [Task 2] isorecv isoconn_put(conn) conn = LOAD hcon->isodata…
When was CVE-2026-74533 disclosed?
CVE-2026-74533 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-2026-74533 actively exploited?
CVE-2026-74533 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 87.4% of all scored CVEs.
What is the CVSS score of CVE-2026-74533?
CVE-2026-74533 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-74533?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74533, 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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