CVE-2026-63828

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. a secondary CVSS source baseline 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

apparmor: mediate the implicit connect of TCP fast open sendmsg

sendmsg()/sendto() with MSG_FASTOPEN is a combination of connect(2) and write(2): it opens the connection in the SYN. apparmor_socket_sendmsg() only checks AA_MAY_SEND, so a profile that grants send but denies connect lets a confined task open an outbound TCP/MPTCP connection that connect(2) would have refused, bypassing connect mediation.

Mediate the implicit connect when MSG_FASTOPEN is set and a destination is supplied. Add it to apparmor_socket_sendmsg() (not the shared aa_sock_msg_perm() helper, which recvmsg also uses) and call aa_sk_perm() directly, mirroring the selinux and tomoyo fixes. sk_is_tcp() does not cover MPTCP fast open, so the SOCK_STREAM/IPPROTO_MPTCP arm is explicit.

CVSS v3
8.4
EG Score
8.4(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity84% × 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 17, 2026

Advisory Details (6)

Auto-updated Jul 20, 2026
No patch confirmed yet.
generic

apparmor: mediate the implicit connect of TCP fast open sendmsg - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/faea60deaa05c76f0772650f42eafde12bd39d93
generic

apparmor: mediate the implicit connect of TCP fast open sendmsg - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7f57428ce00891d26b0f087ef754a4d820ec83aa
generic

apparmor: mediate the implicit connect of TCP fast open sendmsg - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4d587cd8a72155089a627130bbd4716ec0856e21
generic

apparmor: mediate the implicit connect of TCP fast open sendmsg - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4a69b83045d3195d5b9a9b053ad840ddb2998b4e
generic

apparmor: mediate the implicit connect of TCP fast open sendmsg - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/45ebb934ea50b436ce49b2f159f090dab0d7fa28
generic

apparmor: mediate the implicit connect of TCP fast open sendmsg - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/07b71c342382b854ab8030b244aeab6a7228ad7d

Vendor Advisories for CVE-2026-63828(2)

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

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (55 versions)5.10.262-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.176-1~deb11u1 (21 versions)6.1.177-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (54 versions)6.1.177-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.95-1~bpo12+1 (29 versions)6.12.95-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (153 versions)7.1.3-1—

Data Freshness Timeline

(refreshed 32× in last 7d / 131× 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 339 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-63828?
CVE-2026-63828 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: apparmor: mediate the implicit connect of TCP fast open sendmsg sendmsg()/sendto() with MSG_FASTOPEN is a combination of connect(2) and write(2): it opens the connection in the SYN. apparmorsocketsendmsg() only checks AAMAYSEND, so…
When was CVE-2026-63828 disclosed?
CVE-2026-63828 was first published in the National Vulnerability Database on July 19, 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-2026-63828 actively exploited?
CVE-2026-63828 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 97.0% of all scored CVEs.
What is the CVSS score of CVE-2026-63828?
CVE-2026-63828 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-63828?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63828, 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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