CVE-2026-64598

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-06. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

smb/client: Fix error code in smb2_aead_req_alloc()

The "*num_sgs" variable is a u32 so "ERR_PTR(*num_sgs)" doesn't work. We would have to do something similar to the previous line where it's cast to int and then long. However, it's simpler to store the return in an int ret variable.

This bug would eventually result in a crash when dereference the invalid error pointer.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
44
EG Risk 44/100CISA SSVC

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
Severity88% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 6, 2026

Last Modified

August 17, 2026

Advisory Details (5)

Auto-updated Aug 8, 2026
Patch available.
generic

smb/client: Fix error code in smb2_aead_req_alloc() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cad756733dc3985188983f3e2eb77e2927209099
generic

smb/client: Fix error code in smb2_aead_req_alloc() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/aa37f5fef78dd11cbf983269da2031e12625c56d
generic

smb/client: Fix error code in smb2_aead_req_alloc() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac
generic

smb/client: Fix error code in smb2_aead_req_alloc() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a187883cc1dc784a4d32537f5d316f1b7b9ad76f
generic

smb/client: Fix error code in smb2_aead_req_alloc() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/61f28012e5650c619223decdb7970e0d3162e949

Vendor Advisories for CVE-2026-64598(2)

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

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-10-04ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-10-04ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-10-04ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1035.38) @ noble2026-10-04ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2018.18) @ resolute2026-10-04ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18) @ resolute2026-10-04ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1011.11) @ resolute2026-10-04ubuntu
ubuntulinux-tools-azure-edge (7.0.0-1014.14~24.04.1) @ noble2026-10-04ubuntu
ubuntulinux-tools-oracle-edge (7.0.0-1011.11~24.04.1) @ noble2026-10-04ubuntu
ubuntulinux-tools-ibm-7.0 (7.0.0-1013.13) @ resolute2026-10-04ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1019.19) @ resolute2026-10-04ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-10-04ubuntu

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 rangeFix by version rangeDependents
linux-6.12—
  • every version up to 6.12.100-1~deb12u1: fixed in 6.12.100-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.95-1~bpo12+1 (30 versions)
  • every version up to 6.12.96-1: fixed in 6.12.96-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (159 versions)
  • every version up to 7.1.4-1: fixed in 7.1.4-1
—

Additional Vendor Advisories

(12)

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 26× in last 7d / 123× 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 253 total refreshes for this CVE.

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

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-64598?
CVE-2026-64598 is a high vulnerability published on August 6, 2026. In the Linux kernel, the following vulnerability has been resolved: smb/client: Fix error code in smb2aeadreq_alloc() The "num_sgs" variable is a u32 so "ERR_PTR(num_sgs)" doesn't work. We would have to do something similar to the previous line where it's cast to int and then long. However, it's…
When was CVE-2026-64598 disclosed?
CVE-2026-64598 was first published on August 6, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64598 actively exploited?
CVE-2026-64598 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-64598?
CVE-2026-64598 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-64598?
A fix for CVE-2026-64598 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-64598 are linked in the Vendor Advisories panel on this page.

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