CVE-2026-45918

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-27. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: 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:

ovpn: tcp - don't deref NULL sk_socket member after tcp_close()

When deleting a peer in case of keepalive expiration, the peer is removed from the OpenVPN hashtable and is temporary inserted in a "release list" for further processing.

This happens in: ovpn_peer_keepalive_work() unlock_ovpn(release_list)

This processing includes detaching from the socket being used to talk to this peer, by restoring its original proto and socket ops/callbacks.

In case of TCP it may happen that, while the peer is sitting in the release list, userspace decides to close the socket. This will result in a concurrent execution of:

tcp_close(sk) __tcp_close(sk) sock_orphan(sk) sk_set_socket(sk, NULL)

The last function call will set sk->sk_socket to NULL.

When the releasing routine is resumed, ovpn_tcp_socket_detach() will attempt to dereference sk->sk_socket to restore its original ops member. This operation will crash due to sk->sk_socket being NULL.

Fix this race condition by testing-and-accessing sk->sk_socket atomically under sk->sk_callback_lock.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 24, 2026

Advisory Details (3)

Auto-updated Jun 24, 2026
No patch confirmed yet.
generic

ovpn: tcp - don't deref NULL sk_socket member after tcp_close() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f998b2c4bec487063a586695159f9a1856e81c56
generic

ovpn: tcp - don't deref NULL sk_socket member after tcp_close() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b9142cf4e066c825ec68752a7dcaceda700bbe26
generic

ovpn: tcp - don't deref NULL sk_socket member after tcp_close() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/94560267d6c41b1ff3fafbab726e3f8a55a6af34

Vendor Advisories for CVE-2026-45918(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.18.14—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.

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.18~rc7-1~exp1 (100 versions)6.18.14-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 52× 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 172 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-45918?
CVE-2026-45918 is a medium vulnerability published on May 27, 2026. In the Linux kernel, the following vulnerability has been resolved: ovpn: tcp - don't deref NULL sksocket member after tcpclose() When deleting a peer in case of keepalive expiration, the peer is removed from the OpenVPN hashtable and is temporary inserted in a "release list" for further…
When was CVE-2026-45918 disclosed?
CVE-2026-45918 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45918 actively exploited?
CVE-2026-45918 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 94.2% of all scored CVEs.
What is the CVSS score of CVE-2026-45918?
CVE-2026-45918 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-45918?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45918, 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.

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