CVE-2026-64328

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
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:

usb: gadget: f_fs: Fix DMA fence leak

In ffs_dmabuf_transfer(), a ffs_dma_fence object is kmalloc'd, with the underlying dma_fence later initialized by dma_fence_init(), which sets its kref counter to 1. Then, dma_resv_add_fence() gets a second reference, and a pointer to the ffs_dma_fence is passed as the usb_request's "context" field.

The dma-resv mechanism will manage the second reference, but the first reference is never properly released; the ffs_dmabuf_cleanup() function decreases the reference count, but only to balance with the reference grab in ffs_dmabuf_signal_done().

The code will then slowly leak memory as more ffs_dma_fence objects are created without being ever freed.

Address this issue by transferring ownership of the fence to the DMA reservation object, by calling dma_fence_put() right after dma_resv_add_fence(). The ffs_dma_fence then gets properly discarded after being signalled.

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
6%
KEV
Not listed

Published

July 25, 2026

Last Modified

September 4, 2026

Advisory Details (4)

Auto-updated Sep 4, 2026
No patch confirmed yet.
generic

usb: gadget: f_fs: Fix DMA fence leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e086c16962a1b0142e2675610e9c06fcfcd4c3a8
generic

usb: gadget: f_fs: Fix DMA fence leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/baa6b6068a3f2bf2ed525a1cb37975905dadc658
generic

usb: gadget: f_fs: Fix DMA fence leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b7475b2dce5e121e687280ba5732ccefe77ffd2f
generic

usb: gadget: f_fs: Fix DMA fence leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0cae3d6109427c455bad0a18dfb3e2a91657e38a

Vendor Advisories for CVE-2026-64328(1)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1019.19) @ resolute2026-09-20ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-20ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-20ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-20ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-20ubuntu

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
linux-6.12—6.12.100-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.95-1~bpo12+1 (30 versions)6.12.96-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (158 versions)7.1.4-1—

Weakness Classification(1)

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

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 16× in last 7d / 58× 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 104 total refreshes for this CVE.

  1. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 01:31 UTCEG score recompute
  3. 2026-09-20 01:31 UTCVendor advisory
  4. 2026-09-20 01:30 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 02:49 UTCEG score recompute
  7. 2026-09-18 02:49 UTCVendor advisory
  8. 2026-09-18 02:49 UTCGHSA enrichment
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 11:57 UTCEG score recompute
  11. 2026-09-16 11:57 UTCVendor advisory
  12. 2026-09-16 11:56 UTCGHSA enrichment
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 09:26 UTCEG score recompute
  15. 2026-09-15 09:26 UTCVendor advisory
  16. 2026-09-15 09:26 UTCGHSA enrichment
  17. 2026-09-13 21:37 UTCEG score recompute
  18. 2026-09-13 21:37 UTCVendor advisory
  19. 2026-09-13 21:37 UTCGHSA enrichment
  20. 2026-09-12 17:48 UTCEG score recompute
  21. 2026-09-12 17:48 UTCVendor advisory
  22. 2026-09-12 17:48 UTCGHSA enrichment
  23. 2026-09-11 16:27 UTCEG score recompute
  24. 2026-09-11 16:27 UTCVendor advisory
  25. 2026-09-11 16:27 UTCGHSA enrichment
Show 75 more
  1. 2026-09-11 09:37 UTCEPSS rescore
  2. 2026-09-10 13:28 UTCEG score recompute
  3. 2026-09-10 13:28 UTCVendor advisory
  4. 2026-09-10 13:28 UTCGHSA enrichment
  5. 2026-09-09 08:38 UTCEG score recompute
  6. 2026-09-09 08:38 UTCVendor advisory
  7. 2026-09-09 08:38 UTCGHSA enrichment
  8. 2026-09-08 22:01 UTCEPSS rescore
  9. 2026-09-07 21:18 UTCEG score recompute
  10. 2026-09-07 21:18 UTCVendor advisory
  11. 2026-09-07 21:18 UTCGHSA enrichment
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-05 19:21 UTCEG score recompute
  15. 2026-09-05 19:21 UTCGHSA enrichment
  16. 2026-09-05 15:31 UTCEPSS rescore
  17. 2026-09-04 15:00 UTCEG score recompute▲ 5.50
  18. 2026-09-04 15:00 UTCGHSA enrichment
  19. 2026-09-04 14:59 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  20. 2026-09-04 05:07 UTCEPSS rescore
  21. 2026-09-02 14:12 UTCEPSS rescore
  22. 2026-09-01 23:22 UTCGHSA enrichment
  23. 2026-09-01 13:54 UTCEPSS rescore
  24. 2026-09-01 04:40 UTCEPSS rescore
  25. 2026-08-30 19:17 UTCEPSS rescore
  26. 2026-08-30 01:22 UTCEPSS rescore
  27. 2026-08-30 00:10 UTCGHSA enrichment
  28. 2026-08-28 21:42 UTCEPSS rescore
  29. 2026-08-26 14:47 UTCEPSS rescore
  30. 2026-08-26 02:54 UTCGHSA enrichment
  31. 2026-08-25 13:49 UTCEPSS rescore
  32. 2026-08-23 03:43 UTCGHSA enrichment
  33. 2026-08-23 00:19 UTCEPSS rescore
  34. 2026-08-21 23:49 UTCEPSS rescore
  35. 2026-08-20 22:55 UTCEPSS rescore
  36. 2026-08-20 04:31 UTCGHSA enrichment
  37. 2026-08-19 17:04 UTCEPSS rescore
  38. 2026-08-18 13:48 UTCEPSS rescore
  39. 2026-08-17 13:47 UTCEPSS rescore
  40. 2026-08-17 05:25 UTCNVD update
  41. 2026-08-17 05:20 UTCGHSA enrichment
  42. 2026-08-17 05:05 UTCMITRE cvelistV5
  43. 2026-08-16 14:56 UTCEPSS rescore
  44. 2026-08-15 01:30 UTCEPSS rescore
  45. 2026-08-14 14:19 UTCGHSA enrichment
  46. 2026-08-13 22:00 UTCEPSS rescore
  47. 2026-08-12 13:51 UTCEPSS rescore
  48. 2026-08-11 15:08 UTCGHSA enrichment
  49. 2026-08-11 00:00 UTCEPSS rescore
  50. 2026-08-09 22:49 UTCGHSA enrichment
  51. 2026-08-09 13:47 UTCEPSS rescore
  52. 2026-08-06 23:38 UTCGHSA enrichment
  53. 2026-08-06 13:47 UTCEPSS rescore
  54. 2026-08-05 19:17 UTCEPSS rescore
  55. 2026-08-05 19:17 UTCEPSS rescore
  56. 2026-08-04 15:10 UTCEPSS rescore
  57. 2026-08-04 10:39 UTCEPSS rescore
  58. 2026-08-04 00:27 UTCGHSA enrichment
  59. 2026-08-03 10:36 UTCEPSS rescore
  60. 2026-08-02 02:27 UTCEPSS rescore
  61. 2026-08-01 04:16 UTCEPSS rescore
  62. 2026-08-01 01:15 UTCEG score recompute
  63. 2026-08-01 01:15 UTCGHSA enrichment
  64. 2026-07-30 16:28 UTCEPSS rescore
  65. 2026-07-30 01:30 UTCEPSS rescore
  66. 2026-07-30 01:30 UTCEPSS rescore
  67. 2026-07-29 02:02 UTCEG score recompute
  68. 2026-07-29 02:02 UTCGHSA enrichment
  69. 2026-07-28 15:37 UTCEPSS rescore
  70. 2026-07-27 14:14 UTCEPSS rescore
  71. 2026-07-26 14:54 UTCEPSS rescore
  72. 2026-07-26 14:54 UTCEPSS rescore
  73. 2026-07-26 02:50 UTCEG score recompute
  74. 2026-07-26 02:50 UTCGHSA enrichment
  75. 2026-07-25 14:18 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-64328?
CVE-2026-64328 is a medium vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix DMA fence leak In ffsdmabuftransfer(), a ffsdmafence object is kmalloc'd, with the underlying dmafence later initialized by dmafence_init(), which sets its kref counter to 1. Then, dmaresvadd_fence() gets a…
When was CVE-2026-64328 disclosed?
CVE-2026-64328 was first published in the National Vulnerability Database on July 25, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64328 actively exploited?
CVE-2026-64328 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 94.5% of all scored CVEs.
What is the CVSS score of CVE-2026-64328?
CVE-2026-64328 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-64328?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64328, 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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