CVE-2026-31721

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-01. 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

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: gadget: f_hid: move list and spinlock inits from bind to alloc

There was an issue when you did the following:

  • setup and bind an hid gadget
  • open /dev/hidg0
  • use the resulting fd in EPOLL_CTL_ADD
  • unbind the UDC
  • bind the UDC
  • use the fd in EPOLL_CTL_DEL

When CONFIG_DEBUG_LIST was enabled, a list_del corruption was reported within remove_wait_queue (via ep_remove_wait_queue). After some debugging I found out that the queues, which f_hid registers via poll_wait were the problem. These were initialized using init_waitqueue_head inside hidg_bind. So effectively, the bind function re-initialized the queues while there were still items in them.

The solution is to move the initialization from hidg_bind to hidg_alloc to extend their lifetimes to the lifetime of the function instance.

Additionally, I found many other possibly problematic init calls in the bind function, which I moved as well.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

May 1, 2026

Last Modified

May 6, 2026

Advisory Details (8)

Auto-updated May 6, 2026
No patch confirmed yet.
generic

usb: gadget: f_hid: move list and spinlock inits from bind to alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f7d00ee1c8082c8a134340aaf16d71a27e29c362
generic

usb: gadget: f_hid: move list and spinlock inits from bind to alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/de93e0862169b5539e00c2b9980b93fd80c37c0d
generic

usb: gadget: f_hid: move list and spinlock inits from bind to alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8ec6a58586f195a88479edcdb0b8027c39f12d03
generic

usb: gadget: f_hid: move list and spinlock inits from bind to alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/81aee4500055876883658b024b6fb61801afe134
generic

usb: gadget: f_hid: move list and spinlock inits from bind to alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5d1bb391ceeebb28327703dd07af8c6324af298f
generic

usb: gadget: f_hid: move list and spinlock inits from bind to alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4e0a88254ad59f6c53a34bf5fa241884ec09e8b2
generic

usb: gadget: f_hid: move list and spinlock inits from bind to alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/26a879a41ed960b3fb4ec773ef2788c515c0e488
generic

usb: gadget: f_hid: move list and spinlock inits from bind to alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/13440c0db227c5db01da751ed966dde4cdd2ea18

Vendor Advisories for CVE-2026-31721(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.10.253—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

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)6.1.170-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (122 versions)6.19.12-1—

Additional Vendor Advisories

(24)

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 8× in last 7d / 56× 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 214 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-31721?
CVE-2026-31721 is a medium vulnerability published on May 1, 2026. In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_hid: move list and spinlock inits from bind to alloc There was an issue when you did the following: setup and bind an hid gadget open /dev/hidg0 use the resulting fd in EPOLLCTLADD unbind the UDC bind the UDC use the…
When was CVE-2026-31721 disclosed?
CVE-2026-31721 was first published in the National Vulnerability Database on May 1, 2026, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31721 actively exploited?
CVE-2026-31721 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 97.3% of all scored CVEs.
What is the CVSS score of CVE-2026-31721?
CVE-2026-31721 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-31721?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31721, 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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