CVE-2026-23408

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-04-01. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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

apparmor: Fix double free of ns_name in aa_replace_profiles()

if ns_name is NULL after 1071 error = aa_unpack(udata, &lh, &ns_name);

and if ent->ns_name contains an ns_name in 1089 } else if (ent->ns_name) {

then ns_name is assigned the ent->ns_name 1095 ns_name = ent->ns_name;

however ent->ns_name is freed at 1262 aa_load_ent_free(ent);

and then again when freeing ns_name at 1270 kfree(ns_name);

Fix this by NULLing out ent->ns_name after it is transferred to ns_name

")

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
7.9%
KEV
Not listed

Published

April 1, 2026

Last Modified

April 24, 2026

Advisory Details (8)

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

apparmor: Fix double free of ns_name in aa_replace_profiles() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c6347a2116ecccb8fd9ee4ebc75ae41d1d7ef689
generic

apparmor: Fix double free of ns_name in aa_replace_profiles() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c053ae381ce227577567d1ef10090ce7506d7a28
generic

apparmor: Fix double free of ns_name in aa_replace_profiles() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/86feeccd6b93ed94bd6655f30de80f163f8d5a45
generic

apparmor: Fix double free of ns_name in aa_replace_profiles() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7998ab3010d2317643f91828f1853d954ef31387
generic

apparmor: Fix double free of ns_name in aa_replace_profiles() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5df0c44e8f5f619d3beb871207aded7c78414502
generic

apparmor: Fix double free of ns_name in aa_replace_profiles() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/55ef2af7490aaf72f8ffe11ec44c6bcb7eb2162a
generic

apparmor: Fix double free of ns_name in aa_replace_profiles() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/35f4caec1352054b9a61cfdf2bf1898073637aa0
generic

apparmor: Fix double free of ns_name in aa_replace_profiles() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/18b5233e860c294a847ee07869d93c0b8673a54b

Vendor Advisories for CVE-2026-23408(1)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1052.58+fips1) @ noble2026-06-11ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1029.30) @ noble2026-06-11ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1096.100) @ jammy2026-06-11ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1109.94) @ jammy2026-06-11ubuntu
ubuntulinux-tools-azure-edge (5.15.0.1110.119~20.04.1) @ focal2026-06-11ubuntu
ubuntulinux-tools-oem-6.17 (6.17.0-1017.17) @ noble2026-06-11ubuntu
ubuntulinux-tools-azure-lts-22.04 (5.15.0.1109.107) @ jammy2026-06-11ubuntu
linuxKernel @ 5.10.253—osv

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.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(7)

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 14× in last 7d / 48× 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 132 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-23408?
CVE-2026-23408 is a high vulnerability published on April 1, 2026. In the Linux kernel, the following vulnerability has been resolved: apparmor: Fix double free of nsname in aareplace_profiles() if ns_name is NULL after 1071 error = aaunpack(udata, &lh, &nsname); and if ent->nsname contains an nsname in 1089 } else if (ent->ns_name) { then nsname is assigned the…
When was CVE-2026-23408 disclosed?
CVE-2026-23408 was first published in the National Vulnerability Database on April 1, 2026, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23408 actively exploited?
CVE-2026-23408 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23408?
CVE-2026-23408 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-23408?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23408, 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

Explore the affected products and dependency analysis for CVE-2026-23408

Explore →

Is Your Infrastructure Affected by CVE-2026-23408?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs