CVE-2026-74535

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: avoid deadlocks in iso_sock_timeout

iso_sock_timeout() takes lock_sock, so sync disabling the timer while holding that lock may deadlock.

iso_sock_timeout() may also run concurrently with iso_conn_del(), which leads to UAF

[Task 1] [Task hdev->workqueue] iso_sock_timeout iso_conn_del iso_conn_hold_unless_zero iso_chan_del `------------> iso_conn_put caller frees hcon iso_conn_put iso_conn_free conn->hcon->iso_data = NULL; /* UAF */

Fix the deadlock by removing the disable from the lock_sock sections. Move the timer from iso_conn to iso_pinfo to decouple it from iso_conn which may need to be freed in lock_sock section. Convert some of the clear_timer to disable_timer.

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
16%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (4)

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

Bluetooth: ISO: avoid deadlocks in iso_sock_timeout - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/82e982f54f962f72646868ddbb2c3bd9ea178568
generic

Bluetooth: ISO: avoid deadlocks in iso_sock_timeout - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3c3d5f85db80145636bb991a6005e2760012b985
generic

Bluetooth: ISO: avoid deadlocks in iso_sock_timeout - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43
generic

Bluetooth: ISO: avoid deadlocks in iso_sock_timeout - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/16d89a63e08280abeef7218970a3bbd7ca62b021

Vendor Advisories for CVE-2026-74535(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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 17:50 UTCGHSA enrichment
  3. 2026-08-20 06:06 UTCGHSA enrichment
  4. 2026-08-19 18:21 UTCEG score recompute
  5. 2026-08-19 18:21 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 06:19 UTCGHSA enrichment
  8. 2026-08-18 18:26 UTCEG score recompute
  9. 2026-08-18 18:26 UTCGHSA enrichment
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 13:49 UTCEPSS rescore
  12. 2026-08-18 06:38 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-2026-74535?
CVE-2026-74535 is a high vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: avoid deadlocks in isosocktimeout isosocktimeout() takes lock_sock, so sync disabling the timer while holding that lock may deadlock. isosocktimeout() may also run concurrently with isoconndel(), which leads to UAF…
When was CVE-2026-74535 disclosed?
CVE-2026-74535 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-2026-74535 actively exploited?
CVE-2026-74535 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 84.4% of all scored CVEs.
What is the CVSS score of CVE-2026-74535?
CVE-2026-74535 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-74535?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74535, 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.

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