CVE-2026-63945

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — Patch released this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock

iso_sock_close() calls iso_sock_clear_timer() before acquiring lock_sock(sk).

iso_sock_clear_timer() reads iso_pi(sk)->conn twice without the socket lock held:

if (!iso_pi(sk)->conn) return; cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);

Concurrently, iso_conn_del() executes under lock_sock(sk) and calls iso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in the final reference to the connection being dropped:

CPU0 CPU1 ---- ---- iso_sock_clear_timer() if (conn != NULL) ... lock_sock(sk) iso_chan_del() iso_pi(sk)->conn = NULL cancel_delayed_work(conn) /* NULL deref or UAF */

iso_pi(sk)->conn is not stable across the unlock window, causing a NULL pointer dereference or use-after-free.

Serialize iso_sock_clear_timer() with the socket lock by moving it inside lock_sock()/release_sock(), matching the pattern used in iso_conn_del() and all other call sites.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 5, 2026

Advisory Details (6)

Auto-updated Jul 21, 2026
No patch confirmed yet.
generic

Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa
generic

Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bc08c15746f25f41dd0508b25780d1e84acbb2ef
generic

Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/996c2104d0726a8fe584f85b3d6327197374a348
generic

Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5
generic

Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4b5f8e608749b7e8fa386c6e4301cf9272595859
generic

Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/35f68f36d9883d56dec21cf85f7556d4657fc393

Vendor Advisories for CVE-2026-63945(2)

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

Patch Availability(7)

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

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 20× in last 7d / 89× 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 242 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 05:55 UTCEG score recompute
  14. 2026-09-14 05:55 UTCVendor advisory
  15. 2026-09-14 05:55 UTCGHSA enrichment
  16. 2026-09-13 16:43 UTCVendor advisory
  17. 2026-09-13 16:43 UTCGHSA enrichment
  18. 2026-09-13 03:31 UTCEG score recompute
  19. 2026-09-13 03:31 UTCVendor advisory
  20. 2026-09-13 03:31 UTCGHSA enrichment
  21. 2026-09-12 10:11 UTCVendor advisory
  22. 2026-09-12 10:11 UTCGHSA enrichment
  23. 2026-09-11 19:39 UTCEG score recompute
  24. 2026-09-11 19:39 UTCVendor advisory
  25. 2026-09-11 19:39 UTCGHSA enrichment
Show 75 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 09:37 UTCEPSS rescore
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 23:28 UTCEG score recompute
  5. 2026-09-07 23:28 UTCVendor advisory
  6. 2026-09-07 23:28 UTCGHSA enrichment
  7. 2026-09-07 16:01 UTCEPSS rescore
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-06 12:59 UTCVendor advisory
  10. 2026-09-06 12:59 UTCGHSA enrichment
  11. 2026-09-05 20:08 UTCEG score recompute
  12. 2026-09-05 20:08 UTCVendor advisory
  13. 2026-09-05 20:08 UTCGHSA enrichment
  14. 2026-09-05 15:31 UTCEPSS rescore
  15. 2026-09-04 05:07 UTCEPSS rescore
  16. 2026-09-01 13:54 UTCEPSS rescore
  17. 2026-09-01 04:40 UTCEPSS rescore
  18. 2026-08-31 05:21 UTCEG score recompute
  19. 2026-08-31 05:21 UTCVendor advisory
  20. 2026-08-31 05:21 UTCGHSA enrichment
  21. 2026-08-30 19:17 UTCEPSS rescore
  22. 2026-08-30 16:07 UTCVendor advisory
  23. 2026-08-30 16:07 UTCGHSA enrichment
  24. 2026-08-30 02:55 UTCEG score recompute
  25. 2026-08-30 02:55 UTCVendor advisory
  26. 2026-08-30 02:55 UTCGHSA enrichment
  27. 2026-08-30 01:22 UTCEPSS rescore
  28. 2026-08-28 21:42 UTCEPSS rescore
  29. 2026-08-27 21:23 UTCEG score recompute
  30. 2026-08-27 21:23 UTCVendor advisory
  31. 2026-08-27 21:23 UTCGHSA enrichment
  32. 2026-08-27 14:25 UTCEPSS rescore
  33. 2026-08-27 03:38 UTCEG score recompute
  34. 2026-08-27 03:38 UTCVendor advisory
  35. 2026-08-27 03:38 UTCGHSA enrichment
  36. 2026-08-26 14:46 UTCEPSS rescore
  37. 2026-08-26 14:19 UTCGHSA enrichment
  38. 2026-08-26 00:52 UTCEG score recompute
  39. 2026-08-26 00:52 UTCVendor advisory
  40. 2026-08-26 00:52 UTCGHSA enrichment
  41. 2026-08-25 13:49 UTCEPSS rescore
  42. 2026-08-25 11:31 UTCVendor advisory
  43. 2026-08-25 11:31 UTCGHSA enrichment
  44. 2026-08-24 22:19 UTCEG score recompute
  45. 2026-08-24 22:19 UTCVendor advisory
  46. 2026-08-24 22:19 UTCGHSA enrichment
  47. 2026-08-24 09:07 UTCVendor advisory
  48. 2026-08-24 09:07 UTCGHSA enrichment
  49. 2026-08-23 19:42 UTCVendor advisory
  50. 2026-08-23 19:42 UTCGHSA enrichment
  51. 2026-08-23 06:31 UTCVendor advisory
  52. 2026-08-23 06:31 UTCGHSA enrichment
  53. 2026-08-22 17:18 UTCVendor advisory
  54. 2026-08-22 17:18 UTCGHSA enrichment
  55. 2026-08-22 03:58 UTCEG score recompute
  56. 2026-08-22 03:58 UTCVendor advisory
  57. 2026-08-22 03:58 UTCGHSA enrichment
  58. 2026-08-21 23:49 UTCEPSS rescore
  59. 2026-08-21 14:46 UTCVendor advisory
  60. 2026-08-21 14:46 UTCGHSA enrichment
  61. 2026-08-21 01:34 UTCEG score recompute
  62. 2026-08-21 01:34 UTCVendor advisory
  63. 2026-08-21 01:33 UTCGHSA enrichment
  64. 2026-08-20 22:55 UTCEPSS rescore
  65. 2026-08-20 12:21 UTCVendor advisory
  66. 2026-08-20 12:21 UTCGHSA enrichment
  67. 2026-08-19 23:09 UTCEG score recompute
  68. 2026-08-19 23:09 UTCVendor advisory
  69. 2026-08-19 23:09 UTCGHSA enrichment
  70. 2026-08-19 17:04 UTCEPSS rescore
  71. 2026-08-19 09:09 UTCVendor advisory
  72. 2026-08-19 09:09 UTCGHSA enrichment
  73. 2026-08-18 19:50 UTCEG score recompute
  74. 2026-08-18 19:50 UTCVendor advisory
  75. 2026-08-18 19:50 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-63945?
CVE-2026-63945 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: serialize isosockclear_timer with socket lock isosockclose() calls isosockclear_timer() before acquiring lock_sock(sk). isosockcleartimer() reads isopi(sk)->conn twice without the socket lock held: if…
When was CVE-2026-63945 disclosed?
CVE-2026-63945 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-2026-63945 actively exploited?
CVE-2026-63945 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 94.0% of all scored CVEs.
What is the CVSS score of CVE-2026-63945?
CVE-2026-63945 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-63945?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63945, 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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