CVE-2026-43432

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-08. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 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:

usb: xhci: Fix memory leak in xhci_disable_slot()

xhci_alloc_command() allocates a command structure and, when the second argument is true, also allocates a completion structure. Currently, the error handling path in xhci_disable_slot() only frees the command structure using kfree(), causing the completion structure to leak.

Use xhci_free_command() instead of kfree(). xhci_free_command() correctly frees both the command structure and the associated completion structure. Since the command structure is allocated with zero-initialization, command->in_ctx is NULL and will not be erroneously freed by xhci_free_command().

This bug was found using an experimental static analysis tool we are developing. The tool is based on the LLVM framework and is specifically designed to detect memory management issues. It is currently under active development and not yet publicly available, but we plan to open-source it after our research is published.

The bug was originally detected on v6.13-rc1 using our static analysis tool, and we have verified that the issue persists in the latest mainline kernel.

We performed build testing on x86_64 with allyesconfig using GCC=11.4.0. Since triggering these error paths in xhci_disable_slot() requires specific hardware conditions or abnormal state, we were unable to construct a test case to reliably trigger these specific error paths at runtime.

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
2.4%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 20, 2026

Advisory Details (8)

Auto-updated Jun 15, 2026
No patch confirmed yet.
generic

usb: xhci: Fix memory leak in xhci_disable_slot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c65f1b840ab8ce72ba68f1b63bab7960f8fdfa89
generic

usb: xhci: Fix memory leak in xhci_disable_slot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c1c8550e70401159184130a1afc6261db01fc0ce
generic

usb: xhci: Fix memory leak in xhci_disable_slot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/807e4fb5140c73eb5dba1e399a990db5c1f3cdf8
generic

usb: xhci: Fix memory leak in xhci_disable_slot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6288baf0c8c4dcfbf206773aede9c1f2269cec28
generic

usb: xhci: Fix memory leak in xhci_disable_slot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/46aea90763832cd6e9b0c2e1c00e6a9512156d4b
generic

usb: xhci: Fix memory leak in xhci_disable_slot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2e2baa8fb5aa4d080cbfeb84c51eff797529f413
generic

usb: xhci: Fix memory leak in xhci_disable_slot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1e800e26d54ccf2ddf2ea6d6cbe021c804d8aa62
generic

usb: xhci: Fix memory leak in xhci_disable_slot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/078b446efc0f5e496c31bccb72b98af979963a83

Vendor Advisories for CVE-2026-43432(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 42× 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 103 total refreshes for this CVE.

  1. 2026-07-13 06:13 UTCEPSS rescore
  2. 2026-07-12 05:46 UTCEPSS rescore
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-09 19:10 UTCEPSS rescore
  5. 2026-07-08 15:16 UTCEPSS rescore
  6. 2026-07-07 13:46 UTCEPSS rescore
  7. 2026-07-06 16:27 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-01 15:06 UTCEPSS rescore
  12. 2026-06-30 23:22 UTCEPSS rescore
  13. 2026-06-29 14:06 UTCEPSS rescore
  14. 2026-06-28 14:07 UTCEPSS rescore
  15. 2026-06-28 04:56 UTCEPSS rescore
  16. 2026-06-28 04:52 UTCEG score recompute
  17. 2026-06-28 04:52 UTCGHSA enrichment
  18. 2026-06-27 03:08 UTCEPSS rescore
  19. 2026-06-26 21:22 UTCEG score recompute
  20. 2026-06-26 21:22 UTCGHSA enrichment
  21. 2026-06-25 13:49 UTCEPSS rescore
  22. 2026-06-25 13:49 UTCEPSS rescore
  23. 2026-06-24 14:05 UTCEPSS rescore
  24. 2026-06-23 21:33 UTCEPSS rescore
  25. 2026-06-22 14:25 UTCEPSS rescore
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  1. 2026-06-22 14:25 UTCEPSS rescore
  2. 2026-06-21 14:56 UTCEPSS rescore
  3. 2026-06-21 14:56 UTCEPSS rescore
  4. 2026-06-21 01:59 UTCEPSS rescore
  5. 2026-06-19 19:25 UTCEPSS rescore
  6. 2026-06-18 17:52 UTCEPSS rescore
  7. 2026-06-18 17:52 UTCEPSS rescore
  8. 2026-06-17 17:53 UTCEPSS rescore
  9. 2026-06-16 17:52 UTCEPSS rescore
  10. 2026-06-16 08:13 UTCEG score recompute
  11. 2026-06-16 08:13 UTCGHSA enrichment
  12. 2026-06-15 17:49 UTCEPSS rescore
  13. 2026-06-15 02:58 UTCEG score recompute
  14. 2026-06-15 02:58 UTCGHSA enrichment
  15. 2026-06-14 02:38 UTCEG score recompute
  16. 2026-06-14 02:38 UTCGHSA enrichment
  17. 2026-06-13 23:00 UTCEPSS rescore
  18. 2026-06-12 23:12 UTCEPSS rescore
  19. 2026-06-12 23:12 UTCEPSS rescore
  20. 2026-06-12 11:23 UTCEG score recompute
  21. 2026-06-12 11:23 UTCGHSA enrichment
  22. 2026-06-11 14:00 UTCEPSS rescore
  23. 2026-06-11 11:04 UTCEG score recompute
  24. 2026-06-11 11:04 UTCGHSA enrichment
  25. 2026-06-10 22:18 UTCEPSS rescore
  26. 2026-06-10 13:22 UTCEPSS rescore
  27. 2026-06-10 13:22 UTCEPSS rescore
  28. 2026-06-10 10:44 UTCEG score recompute
  29. 2026-06-10 10:44 UTCGHSA enrichment
  30. 2026-06-09 10:24 UTCEG score recompute
  31. 2026-06-09 10:24 UTCGHSA enrichment
  32. 2026-06-08 14:17 UTCEPSS rescore
  33. 2026-06-08 14:17 UTCEPSS rescore
  34. 2026-06-08 10:04 UTCEG score recompute
  35. 2026-06-08 10:04 UTCGHSA enrichment
  36. 2026-06-07 15:25 UTCEPSS rescore
  37. 2026-06-07 15:25 UTCEPSS rescore
  38. 2026-06-07 09:45 UTCEG score recompute
  39. 2026-06-07 09:45 UTCGHSA enrichment
  40. 2026-06-06 13:47 UTCEPSS rescore
  41. 2026-06-06 13:47 UTCEPSS rescore
  42. 2026-06-06 09:25 UTCEG score recompute
  43. 2026-06-06 09:24 UTCGHSA enrichment
  44. 2026-06-05 22:47 UTCEPSS rescore
  45. 2026-06-05 09:05 UTCEG score recompute
  46. 2026-06-05 09:05 UTCGHSA enrichment
  47. 2026-06-05 06:10 UTCEPSS rescore
  48. 2026-06-05 06:10 UTCEPSS rescore
  49. 2026-06-04 13:12 UTCEPSS rescore
  50. 2026-06-04 13:12 UTCEPSS rescore
  51. 2026-06-04 08:44 UTCEG score recompute
  52. 2026-06-04 08:44 UTCGHSA enrichment
  53. 2026-06-03 08:24 UTCEG score recompute
  54. 2026-06-03 08:24 UTCGHSA enrichment
  55. 2026-06-02 20:13 UTCEPSS rescore
  56. 2026-06-02 08:04 UTCEG score recompute
  57. 2026-06-02 08:04 UTCGHSA enrichment
  58. 2026-06-01 13:52 UTCEPSS rescore
  59. 2026-06-01 13:52 UTCEPSS rescore
  60. 2026-06-01 07:44 UTCEG score recompute▲ 5.50
  61. 2026-06-01 07:44 UTCGHSA enrichment
  62. 2026-05-31 22:30 UTCEPSS rescore
  63. 2026-05-31 22:30 UTCEPSS rescore
  64. 2026-05-31 00:16 UTCEPSS rescore
  65. 2026-05-31 00:16 UTCEPSS rescore
  66. 2026-05-29 13:44 UTCEPSS rescore
  67. 2026-05-29 13:44 UTCEPSS rescore
  68. 2026-05-28 13:44 UTCEPSS rescore
  69. 2026-05-28 13:44 UTCEPSS rescore
  70. 2026-05-27 13:40 UTCEPSS rescore
  71. 2026-05-27 13:40 UTCEPSS rescore
  72. 2026-05-26 13:44 UTCEPSS rescore
  73. 2026-05-26 07:18 UTCEPSS rescore
  74. 2026-05-21 22:43 UTCEPSS rescore
  75. 2026-05-20 22:38 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-43432?
CVE-2026-43432 is a medium vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix memory leak in xhcidisableslot() xhcialloccommand() allocates a command structure and, when the second argument is true, also allocates a completion structure. Currently, the error handling path in xhcidisableslot()…
When was CVE-2026-43432 disclosed?
CVE-2026-43432 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43432 actively exploited?
CVE-2026-43432 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43432?
CVE-2026-43432 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-43432?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43432, 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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