CVE-2026-63946

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 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

A fix is available — apply it.

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

Bluetooth: ISO: fix UAF in iso_recv_frame

iso_recv_frame reads conn->sk under iso_conn_lock but releases the lock before using sk, with no reference held. A concurrent iso_sock_kill() can free sk in that window, causing use-after-free on sk->sk_state and sock_queue_rcv_skb().

Fix by replacing the bare pointer read with iso_sock_hold(conn), which calls sock_hold() while the spinlock is held, atomically elevating the refcount before the lock drops. Add a drop_put label so sock_put() is called on all exit paths where the hold succeeded.

CVSS v3
8.8
EG Score
8.8(medium)
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
26%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 5, 2026

Advisory Details (6)

Auto-updated Jul 20, 2026
No patch confirmed yet.
generic

Bluetooth: ISO: fix UAF in iso_recv_frame - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c57ea90f203c8b8b41a474f19a09000d0f841436
generic

Bluetooth: ISO: fix UAF in iso_recv_frame - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c318aa51830a3d2cc1229968fe521441c97356cd
generic

Bluetooth: ISO: fix UAF in iso_recv_frame - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b04ec131325baf4ea4577d6c6e6b86cf092e3731
generic

Bluetooth: ISO: fix UAF in iso_recv_frame - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/47f23a259517abbdb8032c057a1e8a6bf3734878
generic

Bluetooth: ISO: fix UAF in iso_recv_frame - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1a6b803b00ccdd7666506adbe01ddae1c72d1ca9
generic

Bluetooth: ISO: fix UAF in iso_recv_frame - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/119fb6f80c44dc1c65d604cf28e64c56bd9b6568

Vendor Advisories for CVE-2026-63946(1)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-08-30ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-30ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-30ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-30ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (138 versions)7.0.12-1—

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 32× in last 7d / 168× 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.

Showing the most recent 100 of 219 total refreshes for this CVE.

  1. 2026-08-30 02:55 UTCEG score recompute
  2. 2026-08-30 02:55 UTCVendor advisory
  3. 2026-08-30 02:55 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-27 22:57 UTCEG score recompute
  7. 2026-08-27 22:57 UTCVendor advisory
  8. 2026-08-27 22:57 UTCGHSA enrichment
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-27 11:53 UTCVendor advisory
  11. 2026-08-27 11:53 UTCGHSA enrichment
  12. 2026-08-26 23:03 UTCEG score recompute
  13. 2026-08-26 23:03 UTCVendor advisory
  14. 2026-08-26 23:03 UTCGHSA enrichment
  15. 2026-08-26 14:46 UTCEPSS rescore
  16. 2026-08-26 11:56 UTCVendor advisory
  17. 2026-08-26 11:56 UTCGHSA enrichment
  18. 2026-08-26 00:52 UTCEG score recompute
  19. 2026-08-26 00:52 UTCVendor advisory
  20. 2026-08-26 00:51 UTCGHSA enrichment
  21. 2026-08-25 13:49 UTCEPSS rescore
  22. 2026-08-25 12:59 UTCVendor advisory
  23. 2026-08-25 12:59 UTCGHSA enrichment
  24. 2026-08-25 01:54 UTCVendor advisory
  25. 2026-08-25 01:54 UTCGHSA enrichment
Show 75 more
  1. 2026-08-24 14:50 UTCEG score recompute
  2. 2026-08-24 14:50 UTCVendor advisory
  3. 2026-08-24 14:50 UTCGHSA enrichment
  4. 2026-08-24 03:44 UTCVendor advisory
  5. 2026-08-24 03:44 UTCGHSA enrichment
  6. 2026-08-23 15:45 UTCVendor advisory
  7. 2026-08-23 15:45 UTCGHSA enrichment
  8. 2026-08-23 04:41 UTCEG score recompute
  9. 2026-08-23 04:41 UTCVendor advisory
  10. 2026-08-23 04:41 UTCGHSA enrichment
  11. 2026-08-23 00:19 UTCEPSS rescore
  12. 2026-08-22 17:36 UTCVendor advisory
  13. 2026-08-22 17:36 UTCGHSA enrichment
  14. 2026-08-22 06:31 UTCEG score recompute
  15. 2026-08-22 06:31 UTCVendor advisory
  16. 2026-08-22 06:31 UTCGHSA enrichment
  17. 2026-08-21 23:49 UTCEPSS rescore
  18. 2026-08-21 19:26 UTCVendor advisory
  19. 2026-08-21 19:26 UTCGHSA enrichment
  20. 2026-08-21 08:22 UTCEG score recompute
  21. 2026-08-21 08:22 UTCVendor advisory
  22. 2026-08-21 08:22 UTCGHSA enrichment
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-20 21:18 UTCVendor advisory
  25. 2026-08-20 21:18 UTCGHSA enrichment
  26. 2026-08-20 10:13 UTCVendor advisory
  27. 2026-08-20 10:13 UTCGHSA enrichment
  28. 2026-08-19 23:09 UTCEG score recompute
  29. 2026-08-19 23:09 UTCVendor advisory
  30. 2026-08-19 23:09 UTCGHSA enrichment
  31. 2026-08-19 17:04 UTCEPSS rescore
  32. 2026-08-19 06:54 UTCVendor advisory
  33. 2026-08-19 06:54 UTCGHSA enrichment
  34. 2026-08-18 19:50 UTCEG score recompute
  35. 2026-08-18 19:50 UTCVendor advisory
  36. 2026-08-18 19:50 UTCGHSA enrichment
  37. 2026-08-18 13:48 UTCEPSS rescore
  38. 2026-08-18 01:52 UTCVendor advisory
  39. 2026-08-18 01:52 UTCGHSA enrichment
  40. 2026-08-17 14:39 UTCEG score recompute
  41. 2026-08-17 14:39 UTCVendor advisory
  42. 2026-08-17 14:39 UTCGHSA enrichment
  43. 2026-08-17 13:47 UTCEPSS rescore
  44. 2026-08-17 03:35 UTCVendor advisory
  45. 2026-08-17 03:35 UTCGHSA enrichment
  46. 2026-08-16 16:31 UTCEG score recompute
  47. 2026-08-16 16:31 UTCVendor advisory
  48. 2026-08-16 16:31 UTCGHSA enrichment
  49. 2026-08-16 14:56 UTCEPSS rescore
  50. 2026-08-16 05:27 UTCEG score recompute
  51. 2026-08-16 05:27 UTCVendor advisory
  52. 2026-08-16 05:27 UTCGHSA enrichment
  53. 2026-08-15 18:23 UTCVendor advisory
  54. 2026-08-15 18:23 UTCGHSA enrichment
  55. 2026-08-15 07:19 UTCEG score recompute
  56. 2026-08-15 07:19 UTCVendor advisory
  57. 2026-08-15 07:19 UTCGHSA enrichment
  58. 2026-08-15 01:30 UTCEPSS rescore
  59. 2026-08-14 19:44 UTCVendor advisory
  60. 2026-08-14 19:44 UTCGHSA enrichment
  61. 2026-08-14 08:40 UTCEG score recompute
  62. 2026-08-14 08:40 UTCVendor advisory
  63. 2026-08-14 08:40 UTCGHSA enrichment
  64. 2026-08-13 22:00 UTCEPSS rescore
  65. 2026-08-13 21:35 UTCVendor advisory
  66. 2026-08-13 21:35 UTCGHSA enrichment
  67. 2026-08-13 10:31 UTCVendor advisory
  68. 2026-08-13 10:31 UTCGHSA enrichment
  69. 2026-08-12 23:26 UTCEG score recompute
  70. 2026-08-12 23:26 UTCVendor advisory
  71. 2026-08-12 23:26 UTCGHSA enrichment
  72. 2026-08-12 13:51 UTCEPSS rescore
  73. 2026-08-12 12:22 UTCVendor advisory
  74. 2026-08-12 12:22 UTCGHSA enrichment
  75. 2026-08-12 01:18 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-63946?
CVE-2026-63946 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix UAF in isorecvframe isorecvframe reads conn->sk under isoconnlock but releases the lock before using sk, with no reference held. A concurrent isosockkill() can free sk in that window, causing use-after-free on…
When was CVE-2026-63946 disclosed?
CVE-2026-63946 was first published in the National Vulnerability Database on July 19, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63946 actively exploited?
CVE-2026-63946 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 73.8% of all scored CVEs.
What is the CVSS score of CVE-2026-63946?
CVE-2026-63946 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-63946?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63946, 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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