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 — Patch released 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
27%
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(3)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-09-18ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-09-18ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-18ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-09-18ubuntu
redhatkernel-0:5.14.0-687.47.1.el9_82026-09-14redhat
redhatkernel-0:6.12.0-211.53.1.el10_22026-09-08redhat

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 (141 versions)7.0.12-1—

Additional Vendor Advisories

(6)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 22× in last 7d / 101× 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 270 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 04:22 UTCEG score recompute
  3. 2026-09-18 04:22 UTCVendor advisory
  4. 2026-09-18 04:22 UTCGHSA enrichment
  5. 2026-09-17 05:36 UTCEG score recompute
  6. 2026-09-17 05:36 UTCVendor advisory
  7. 2026-09-17 05:36 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 13:06 UTCEG score recompute
  10. 2026-09-16 13:06 UTCVendor advisory
  11. 2026-09-16 13:06 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-14 05:35 UTCVendor advisory
  14. 2026-09-14 05:35 UTCGHSA enrichment
  15. 2026-09-13 18:29 UTCEG score recompute
  16. 2026-09-13 18:29 UTCVendor advisory
  17. 2026-09-13 18:29 UTCGHSA enrichment
  18. 2026-09-13 07:03 UTCVendor advisory
  19. 2026-09-13 07:03 UTCGHSA enrichment
  20. 2026-09-12 19:57 UTCEG score recompute
  21. 2026-09-12 19:57 UTCVendor advisory
  22. 2026-09-12 19:57 UTCGHSA enrichment
  23. 2026-09-12 07:18 UTCVendor advisory
  24. 2026-09-12 07:18 UTCGHSA enrichment
  25. 2026-09-11 19:39 UTCEG score recompute
Show 75 more
  1. 2026-09-11 19:39 UTCVendor advisory
  2. 2026-09-11 19:39 UTCGHSA enrichment
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-11 09:37 UTCEPSS rescore
  5. 2026-09-08 22:01 UTCEPSS rescore
  6. 2026-09-07 23:28 UTCEG score recompute
  7. 2026-09-07 23:28 UTCVendor advisory
  8. 2026-09-07 23:28 UTCGHSA enrichment
  9. 2026-09-07 16:01 UTCEPSS rescore
  10. 2026-09-06 13:47 UTCEPSS rescore
  11. 2026-09-06 12:59 UTCVendor advisory
  12. 2026-09-06 12:59 UTCGHSA enrichment
  13. 2026-09-05 20:08 UTCEG score recompute
  14. 2026-09-05 20:08 UTCVendor advisory
  15. 2026-09-05 20:08 UTCGHSA enrichment
  16. 2026-09-05 15:31 UTCEPSS rescore
  17. 2026-09-04 05:07 UTCEPSS rescore
  18. 2026-09-02 14:12 UTCEPSS rescore
  19. 2026-09-01 13:54 UTCEPSS rescore
  20. 2026-09-01 04:40 UTCEPSS rescore
  21. 2026-08-31 02:44 UTCEG score recompute
  22. 2026-08-31 02:44 UTCVendor advisory
  23. 2026-08-31 02:44 UTCGHSA enrichment
  24. 2026-08-30 19:17 UTCEPSS rescore
  25. 2026-08-30 15:39 UTCVendor advisory
  26. 2026-08-30 15:39 UTCGHSA enrichment
  27. 2026-08-30 02:55 UTCEG score recompute
  28. 2026-08-30 02:55 UTCVendor advisory
  29. 2026-08-30 02:55 UTCGHSA enrichment
  30. 2026-08-30 01:22 UTCEPSS rescore
  31. 2026-08-28 21:42 UTCEPSS rescore
  32. 2026-08-27 22:57 UTCEG score recompute
  33. 2026-08-27 22:57 UTCVendor advisory
  34. 2026-08-27 22:57 UTCGHSA enrichment
  35. 2026-08-27 14:25 UTCEPSS rescore
  36. 2026-08-27 11:53 UTCVendor advisory
  37. 2026-08-27 11:53 UTCGHSA enrichment
  38. 2026-08-26 23:03 UTCEG score recompute
  39. 2026-08-26 23:03 UTCVendor advisory
  40. 2026-08-26 23:03 UTCGHSA enrichment
  41. 2026-08-26 14:46 UTCEPSS rescore
  42. 2026-08-26 11:56 UTCVendor advisory
  43. 2026-08-26 11:56 UTCGHSA enrichment
  44. 2026-08-26 00:52 UTCEG score recompute
  45. 2026-08-26 00:52 UTCVendor advisory
  46. 2026-08-26 00:51 UTCGHSA enrichment
  47. 2026-08-25 13:49 UTCEPSS rescore
  48. 2026-08-25 12:59 UTCVendor advisory
  49. 2026-08-25 12:59 UTCGHSA enrichment
  50. 2026-08-25 01:54 UTCVendor advisory
  51. 2026-08-25 01:54 UTCGHSA enrichment
  52. 2026-08-24 14:50 UTCEG score recompute
  53. 2026-08-24 14:50 UTCVendor advisory
  54. 2026-08-24 14:50 UTCGHSA enrichment
  55. 2026-08-24 03:44 UTCVendor advisory
  56. 2026-08-24 03:44 UTCGHSA enrichment
  57. 2026-08-23 15:45 UTCVendor advisory
  58. 2026-08-23 15:45 UTCGHSA enrichment
  59. 2026-08-23 04:41 UTCEG score recompute
  60. 2026-08-23 04:41 UTCVendor advisory
  61. 2026-08-23 04:41 UTCGHSA enrichment
  62. 2026-08-23 00:19 UTCEPSS rescore
  63. 2026-08-22 17:36 UTCVendor advisory
  64. 2026-08-22 17:36 UTCGHSA enrichment
  65. 2026-08-22 06:31 UTCEG score recompute
  66. 2026-08-22 06:31 UTCVendor advisory
  67. 2026-08-22 06:31 UTCGHSA enrichment
  68. 2026-08-21 23:49 UTCEPSS rescore
  69. 2026-08-21 19:26 UTCVendor advisory
  70. 2026-08-21 19:26 UTCGHSA enrichment
  71. 2026-08-21 08:22 UTCEG score recompute
  72. 2026-08-21 08:22 UTCVendor advisory
  73. 2026-08-21 08:22 UTCGHSA enrichment
  74. 2026-08-20 22:55 UTCEPSS rescore
  75. 2026-08-20 21:18 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 72.9% 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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