CVE-2026-23146

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-02-14. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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

Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work

hci_uart_set_proto() sets HCI_UART_PROTO_INIT before calling hci_uart_register_dev(), which calls proto->open() to initialize hu->priv. However, if a TTY write wakeup occurs during this window, hci_uart_tx_wakeup() may schedule write_work before hu->priv is initialized, leading to a NULL pointer dereference in hci_uart_write_work() when proto->dequeue() accesses hu->priv.

The race condition is:

CPU0 CPU1 ---- ---- hci_uart_set_proto() set_bit(HCI_UART_PROTO_INIT) hci_uart_register_dev() tty write wakeup hci_uart_tty_wakeup() hci_uart_tx_wakeup() schedule_work(&hu->write_work) proto->open(hu) // initializes hu->priv hci_uart_write_work() hci_uart_dequeue() proto->dequeue(hu) // accesses hu->priv (NULL!)

Fix this by moving set_bit(HCI_UART_PROTO_INIT) after proto->open() succeeds, ensuring hu->priv is initialized before any work can be scheduled.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

February 14, 2026

Last Modified

June 17, 2026

Advisory Details (7)

Auto-updated Aug 7, 2026
No patch confirmed yet.
generic

Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ccc683f597ceb28deb966427ae948e5ac739a909
generic

Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b0a900939e7e4866d9b90e9112514b72c451e873
generic

Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/937a573423ce5a96fdb1fd425dc6b8d8d4ab5779
generic

Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/53e54cb31e667fca05b1808b990eac0807d1dab0
generic

Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/186d147cf7689ba1f9b3ddb753ab634a84940cc9
generic

Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0c3cd7a0b862c37acbee6d9502107146cc944398
generic

Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/03e8c90c62233382042b7bd0fa8b8900552fdb62

Vendor Advisories for CVE-2026-23146(2)

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

Patch Availability(23)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.176.161) @ jammy2026-06-12ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1057.57) @ jammy2026-06-12ubuntu
ubuntulinux-tools-realtime-5.15 (5.15.0.1104.108) @ jammy2026-06-12ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.176.186~20.04.1) @ focal2026-06-12ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1110.95) @ jammy2026-06-12ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1099.97) @ jammy2026-06-12ubuntu
ubuntulinux-tools-ibm-5.15 (5.15.0.1099.95) @ jammy2026-06-12ubuntu
ubuntulinux-tools-azure-edge (5.15.0.1110.119~20.04.1) @ focal2026-06-12ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1070 (5.15.0-1070.74) @ jammy2026-06-12ubuntu
ubuntulinux-virtual-6.8 (6.8.0-117.117) @ noble2026-06-12ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1054.57.1) @ noble2026-06-12ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-116.116+fips1) @ noble2026-06-12ubuntu
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.8.0-1054.57~22.04.1) @ jammy2026-06-12ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1106.115~20.04.1) @ focal2026-06-12ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1024.24) @ noble2026-06-12ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1056.62) @ noble2026-06-12ubuntu
ubuntulinux-tools-gcp-fips-5.15 (5.15.0.1105.95) @ jammy2026-06-12ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1059.65+fips1) @ noble2026-06-12ubuntu
ubuntulinux-tools-kvm-5.15 (5.15.0.1097.93) @ jammy2026-06-12ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1057.57~20.04.1) @ focal2026-06-12ubuntu
redhatkernel-0:5.14.0-611.5.1.el9_72025-11-11redhat
redhatkernel-0:6.12.0-124.8.1.el10_12025-11-11redhat
linuxKernel @ 5.10.249—osv

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (48 versions)5.10.249-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (46 versions)6.1.162-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.69-1~bpo12+1 (10 versions)6.12.69-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.18~rc7-1~exp1 (95 versions)6.18.9-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(23)

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 7× in last 7d / 49× 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 153 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-23146?
CVE-2026-23146 is a medium vulnerability published on February 14, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hciuart: fix null-ptr-deref in hciuartwritework hciuartsetproto() sets HCIUARTPROTOINIT before calling hciuartregister_dev(), which calls proto->open() to initialize hu->priv. However, if a TTY write wakeup occurs during…
When was CVE-2026-23146 disclosed?
CVE-2026-23146 was first published in the National Vulnerability Database on February 14, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23146 actively exploited?
CVE-2026-23146 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 97.6% of all scored CVEs.
What is the CVSS score of CVE-2026-23146?
CVE-2026-23146 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-23146?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23146, 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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