CVE-2026-64004

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

net/iucv: fix locking in .getsockopt

Mirror iucv_sock_setsockopt() and wrap the whole switch in lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock becomes redundant and is removed.

Any AF_IUCV HIPER user can potentially crash the kernel by racing recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences iucv->hs_dev->mtu after iucv_sock_close() (called from the racing recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference oops.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Jul 21, 2026
No patch confirmed yet.
generic

net/iucv: fix locking in .getsockopt - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e
generic

net/iucv: fix locking in .getsockopt - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79
generic

net/iucv: fix locking in .getsockopt - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd
generic

net/iucv: fix locking in .getsockopt - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a
generic

net/iucv: fix locking in .getsockopt - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920
generic

net/iucv: fix locking in .getsockopt - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb
generic

net/iucv: fix locking in .getsockopt - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88
generic

net/iucv: fix locking in .getsockopt - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee

Vendor Advisories for CVE-2026-64004(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-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-30ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-30ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-30ubuntu
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

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

(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 34× in last 7d / 160× 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 206 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64004?
CVE-2026-64004 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix locking in .getsockopt Mirror iucvsocksetsockopt() and wrap the whole switch in locksock()/releasesock(). The pre-existing SO_MSGLIMIT-only lock becomes redundant and is removed. Any AF_IUCV HIPER user can potentially…
When was CVE-2026-64004 disclosed?
CVE-2026-64004 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-2026-64004 actively exploited?
CVE-2026-64004 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 97.1% of all scored CVEs.
What is the CVSS score of CVE-2026-64004?
CVE-2026-64004 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-64004?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64004, 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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