CVE-2026-64034

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-19. the CNA's CVSS baseline 9.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 sources updated this week
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: None knownExposed: 0

A fix is available — apply it.

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

net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer

In mana_hwc_rx_event_handler(), resp->response.hwc_msg_id is read from DMA-coherent memory and bounds-checked, then mana_hwc_handle_resp() re-reads the same field from the same DMA buffer for test_bit() and pointer arithmetic.

DMA-coherent memory is mapped uncacheable on x86 and is shared, unencrypted, in Confidential VMs (SEV-SNP/TDX), so each load goes directly to host-visible memory. A H/W can modify the value between the check and the use, bypassing the bounds validation.

Fix this by reading hwc_msg_id exactly once using READ_ONCE() into a stack-local variable in mana_hwc_rx_event_handler(), and passing the validated value as a parameter to mana_hwc_handle_resp().

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity93% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 5, 2026

Advisory Details (7)

Auto-updated Aug 23, 2026
No patch confirmed yet.
generic

net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/35f0f0a2536a4d604b4dbad92c85c4a8fdebb870
generic

net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3c4db56ccd13dd020fbf43afabaee74a40ec75e4
generic

net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/09ec063d87c2dd3fa6f3561361a017bd882e9f37
generic

net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6180a06bbc99fd9114b8db4be6c4d46e40f046ef
generic

net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/566f42fb67a7ebfed6650e407e5b72e6b3e83bf7
generic

net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/70ad2dff8d052a85dfef15715b531f38a29108cf
generic

net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a201c66edf2ebc6cfdc3813a889ba20fecebfae3

Vendor Advisories for CVE-2026-64034(1)

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

Patch Availability(22)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-08-30ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-08-30ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-30ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-08-30ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-08-30ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-30ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-30ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-08-30ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-08-30ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-30ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-08-30ubuntu
ubuntulinux-tools-azure-fde-6.17 (6.17.0-1018.18~24.04.1) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-08-30ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1021.21~24.04.1) @ noble2026-08-30ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-08-30ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-08-30ubuntu

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 (138 versions)7.0.12-1—

All Vendor Advisories

(22)

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 60× in last 7d / 367× 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 455 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64034?
CVE-2026-64034 is a critical vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: net: mana: Fix TOCTOU double-fetch of hwcmsgid from DMA buffer In manahwcrxeventhandler(), resp->response.hwcmsgid is read from DMA-coherent memory and bounds-checked, then manahwchandle_resp() re-reads the same field from the same…
When was CVE-2026-64034 disclosed?
CVE-2026-64034 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-2026-64034 actively exploited?
CVE-2026-64034 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 95.4% of all scored CVEs.
What is the CVSS score of CVE-2026-64034?
CVE-2026-64034 has a CVSS v4.0 base score of 9.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-64034?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64034, 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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