CVE-2026-64055

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-19. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

net: ethernet: cortina: Carry over frag counter

The gmac_rx() NAPI poll function assembles packets in an SKB from a ring buffer.

If the ring buffer gets completely emptied during a poll cycle, we exit gmac_rx(), but the packet is not yet completely assembled in the SKB, yet the fragment counter frag_nr is reset to zero on the next invocation.

Solve this by making the RX fragment counter a part of the port struct, and carry it over between invocations.

Reset the fragment counter only right after calling napi_gro_frags(), on error (after calling napi_free_frags()) or if stopping the port.

Reset it in some place where not strictly necessary just to emphasize what is going on.

This was found by Sashiko during normal patch review.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 26, 2026
No patch confirmed yet.
generic

net: ethernet: cortina: Carry over frag counter - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7
generic

net: ethernet: cortina: Carry over frag counter - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f
generic

net: ethernet: cortina: Carry over frag counter - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b
generic

net: ethernet: cortina: Carry over frag counter - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41
generic

net: ethernet: cortina: Carry over frag counter - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8
generic

net: ethernet: cortina: Carry over frag counter - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0
generic

net: ethernet: cortina: Carry over frag counter - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5
generic

net: ethernet: cortina: Carry over frag counter - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253

Vendor Advisories for CVE-2026-64055(1)

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

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
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-oracle-lts-22.04 (5.15.0.1109.105) @ 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-nvidia-hwe-24.04-edge (7.0.0-1016.16~24.04.1) @ noble2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-08-30ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-08-30ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-08-30ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-08-30ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-08-30ubuntu

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
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

(16)

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 61× in last 7d / 371× 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 464 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 02:50 UTCGHSA enrichment
  6. 2026-08-30 01:22 UTCEPSS rescore
  7. 2026-08-28 21:42 UTCEPSS rescore
  8. 2026-08-28 01:42 UTCVendor advisory
  9. 2026-08-28 01:42 UTCGHSA enrichment
  10. 2026-08-27 21:22 UTCEG score recompute
  11. 2026-08-27 21:22 UTCVendor advisory
  12. 2026-08-27 21:22 UTCGHSA enrichment
  13. 2026-08-27 11:49 UTCVendor advisory
  14. 2026-08-27 11:49 UTCGHSA enrichment
  15. 2026-08-27 02:19 UTCVendor advisory
  16. 2026-08-27 02:19 UTCGHSA enrichment
  17. 2026-08-26 22:18 UTCEG score recompute
  18. 2026-08-26 22:18 UTCGHSA enrichment
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-26 12:57 UTCVendor advisory
  21. 2026-08-26 12:57 UTCGHSA enrichment
  22. 2026-08-26 08:57 UTCVendor advisory
  23. 2026-08-26 08:57 UTCGHSA enrichment
  24. 2026-08-26 04:51 UTCVendor advisory
  25. 2026-08-26 04:51 UTCGHSA enrichment
Show 75 more
  1. 2026-08-26 00:51 UTCVendor advisory
  2. 2026-08-26 00:51 UTCGHSA enrichment
  3. 2026-08-25 20:18 UTCVendor advisory
  4. 2026-08-25 20:17 UTCGHSA enrichment
  5. 2026-08-25 15:42 UTCEG score recompute
  6. 2026-08-25 15:42 UTCVendor advisory
  7. 2026-08-25 15:41 UTCGHSA enrichment
  8. 2026-08-25 13:49 UTCEPSS rescore
  9. 2026-08-25 11:08 UTCVendor advisory
  10. 2026-08-25 11:08 UTCGHSA enrichment
  11. 2026-08-25 07:06 UTCVendor advisory
  12. 2026-08-25 07:06 UTCGHSA enrichment
  13. 2026-08-25 03:06 UTCVendor advisory
  14. 2026-08-25 03:06 UTCGHSA enrichment
  15. 2026-08-24 23:04 UTCVendor advisory
  16. 2026-08-24 23:03 UTCGHSA enrichment
  17. 2026-08-24 19:03 UTCEG score recompute
  18. 2026-08-24 19:03 UTCVendor advisory
  19. 2026-08-24 19:03 UTCGHSA enrichment
  20. 2026-08-24 13:07 UTCEG score recompute
  21. 2026-08-24 13:07 UTCVendor advisory
  22. 2026-08-24 13:07 UTCGHSA enrichment
  23. 2026-08-24 09:05 UTCVendor advisory
  24. 2026-08-24 09:05 UTCGHSA enrichment
  25. 2026-08-24 04:19 UTCVendor advisory
  26. 2026-08-24 04:18 UTCGHSA enrichment
  27. 2026-08-24 00:18 UTCVendor advisory
  28. 2026-08-24 00:18 UTCGHSA enrichment
  29. 2026-08-23 20:18 UTCVendor advisory
  30. 2026-08-23 20:18 UTCGHSA enrichment
  31. 2026-08-23 16:18 UTCVendor advisory
  32. 2026-08-23 16:18 UTCGHSA enrichment
  33. 2026-08-23 12:17 UTCVendor advisory
  34. 2026-08-23 12:17 UTCGHSA enrichment
  35. 2026-08-23 08:16 UTCVendor advisory
  36. 2026-08-23 08:16 UTCGHSA enrichment
  37. 2026-08-23 04:15 UTCEG score recompute
  38. 2026-08-23 04:15 UTCVendor advisory
  39. 2026-08-23 04:15 UTCGHSA enrichment
  40. 2026-08-23 00:19 UTCEPSS rescore
  41. 2026-08-23 00:14 UTCVendor advisory
  42. 2026-08-23 00:14 UTCGHSA enrichment
  43. 2026-08-22 20:14 UTCVendor advisory
  44. 2026-08-22 20:14 UTCGHSA enrichment
  45. 2026-08-22 16:14 UTCVendor advisory
  46. 2026-08-22 16:14 UTCGHSA enrichment
  47. 2026-08-22 12:09 UTCVendor advisory
  48. 2026-08-22 12:09 UTCGHSA enrichment
  49. 2026-08-22 07:45 UTCVendor advisory
  50. 2026-08-22 07:45 UTCGHSA enrichment
  51. 2026-08-22 03:45 UTCEG score recompute
  52. 2026-08-22 03:45 UTCVendor advisory
  53. 2026-08-22 03:45 UTCGHSA enrichment
  54. 2026-08-21 23:49 UTCEPSS rescore
  55. 2026-08-21 23:45 UTCVendor advisory
  56. 2026-08-21 23:45 UTCGHSA enrichment
  57. 2026-08-21 19:44 UTCVendor advisory
  58. 2026-08-21 19:44 UTCGHSA enrichment
  59. 2026-08-21 15:44 UTCVendor advisory
  60. 2026-08-21 15:44 UTCGHSA enrichment
  61. 2026-08-21 11:43 UTCVendor advisory
  62. 2026-08-21 11:43 UTCGHSA enrichment
  63. 2026-08-21 07:11 UTCVendor advisory
  64. 2026-08-21 07:11 UTCGHSA enrichment
  65. 2026-08-21 03:11 UTCVendor advisory
  66. 2026-08-21 03:11 UTCGHSA enrichment
  67. 2026-08-20 23:10 UTCEG score recompute
  68. 2026-08-20 23:10 UTCVendor advisory
  69. 2026-08-20 23:10 UTCGHSA enrichment
  70. 2026-08-20 22:55 UTCEPSS rescore
  71. 2026-08-20 19:09 UTCVendor advisory
  72. 2026-08-20 19:09 UTCGHSA enrichment
  73. 2026-08-20 15:09 UTCVendor advisory
  74. 2026-08-20 15:09 UTCGHSA enrichment
  75. 2026-08-20 11:00 UTCVendor advisory

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-64055?
CVE-2026-64055 is a critical vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: net: ethernet: cortina: Carry over frag counter The gmac_rx() NAPI poll function assembles packets in an SKB from a ring buffer. If the ring buffer gets completely emptied during a poll cycle, we exit gmac_rx(), but the packet is…
When was CVE-2026-64055 disclosed?
CVE-2026-64055 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-2026-64055 actively exploited?
CVE-2026-64055 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.4% of all scored CVEs.
What is the CVSS score of CVE-2026-64055?
CVE-2026-64055 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-64055?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64055, 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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