CVE-2026-53183

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: 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:

mptcp: allow subflow rcv wnd to shrink

In MPTCP connection, the window field in the TCP header refers to the MPTCP-level rcv_nxt and it's right edge should not move backward. Such constraint is enforced at DSS option generation time.

At the same time, the TCP stack ensures independently that the TCP-level rcv wnd right's edge does not move backward. That in turn causes artificial inflating of the MPTCP rcv window when the incoming data is acked at the TCP level and is OoO in the MPTCP sequence space (or lands in the backlog).

As a consequence, the incoming traffic can exceed the receiver rcvbuf size even when the sender is not misbehaving.

Prevent such scenario forcibly allowing the TCP subflow to shrink the TCP-level rcv wnd regardless of the current netns setting.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

June 25, 2026

Last Modified

August 5, 2026

Advisory Details (6)

Auto-updated Jun 28, 2026
No patch confirmed yet.
generic

mptcp: allow subflow rcv wnd to shrink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/da23be77e1292cd611e736c3aa17da633d7ddce7
generic

mptcp: allow subflow rcv wnd to shrink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c297a4e65c50a2b807d9309b22615080faffa8f3
generic

mptcp: allow subflow rcv wnd to shrink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bf364b0f10b27679140699821f88af7f01e2a6e3
generic

mptcp: allow subflow rcv wnd to shrink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b1fd13074f22105deec45aa02283e322733e0c2d
generic

mptcp: allow subflow rcv wnd to shrink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/aa3861f40ac32706d9e97bfac76984613e278788
generic

mptcp: allow subflow rcv wnd to shrink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/653245266913f03fcf21cbca68eed5c197a33e52

Vendor Advisories for CVE-2026-53183(2)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
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 (145 versions)7.0.13-1—

Data Freshness Timeline

(refreshed 5× in last 7d / 81× 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 297 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-53183?
CVE-2026-53183 is a high vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: mptcp: allow subflow rcv wnd to shrink In MPTCP connection, the window field in the TCP header refers to the MPTCP-level rcv_nxt and it's right edge should not move backward. Such constraint is enforced at DSS option generation…
When was CVE-2026-53183 disclosed?
CVE-2026-53183 was first published in the National Vulnerability Database on June 25, 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-2026-53183 actively exploited?
CVE-2026-53183 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 60.1% of all scored CVEs.
What is the CVSS score of CVE-2026-53183?
CVE-2026-53183 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-53183?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53183, 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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