CVE-2026-64439

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-25. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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: 0%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

crypto: krb5 - filter out async aead implementations at alloc

krb5_aead_encrypt(), krb5_aead_decrypt() in rfc3961_simplified.c and rfc8009_encrypt(), rfc8009_decrypt() in rfc8009_aes2.c set a NULL completion callback and treat any negative return from crypto_aead_{encrypt,decrypt}() as terminal, falling through to kfree_sensitive(buffer). When the encrypt_name resolves to an async AEAD instance the request returns -EINPROGRESS, the buffer is freed while the backend's worker still holds a pointer, and the worker dereferences the freed slab on completion.

KASAN report under UML+SLUB with a synthetic async aead backend bound to krb5->encrypt_name:

BUG: KASAN: slab-use-after-free in t5_stub_complete+0x7d/0xc7

The helpers were written synchronously, so filter the async instances out at allocation time instead of plumbing crypto_wait_req() through every call site.

Reachable via net/rxrpc/rxgk.c, fs/afs/cm_security.c and net/ceph/crypto.c on systems with an async AEAD provider bound to the krb5 enctype name.

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%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

July 25, 2026

Last Modified

September 3, 2026

Advisory Details (3)

Auto-updated Sep 10, 2026
No patch confirmed yet.
generic

crypto: krb5 - filter out async aead implementations at alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ef6feb77e2d91761427c5b773edc9c97e1b706ad
generic

crypto: krb5 - filter out async aead implementations at alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6c9dddeb582fde005360f4fe02c760d45ca05fb5
generic

crypto: krb5 - filter out async aead implementations at alloc - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2b7bd6dccff14b8b632c5244f1fd506918077221

Vendor Advisories for CVE-2026-64439(1)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-31.31~24.04.1) @ noble2026-09-15ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-15ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-15ubuntu

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

(1 across 1 ecosystem)
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

(3)

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 59× in last 7d / 194× 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 383 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-64439?
CVE-2026-64439 is a critical vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: crypto: krb5 - filter out async aead implementations at alloc krb5aeadencrypt(), krb5aeaddecrypt() in rfc3961_simplified.c and rfc8009encrypt(), rfc8009decrypt() in rfc8009_aes2.c set a NULL completion callback and treat any…
When was CVE-2026-64439 disclosed?
CVE-2026-64439 was first published in the National Vulnerability Database on July 25, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64439 actively exploited?
CVE-2026-64439 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 63.7% of all scored CVEs.
What is the CVSS score of CVE-2026-64439?
CVE-2026-64439 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-64439?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64439, 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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