CVE-2025-40186

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2025-11-13. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2025-150388 (ENISA EUVD) · GHSA-qx52-pj36-489j (GitHub Security Advisories)Source: ENISA EUVD

8.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request().

syzbot reported the splat below in tcp_conn_request(). [0]

If a listener is close()d while a TFO socket is being processed in tcp_conn_request(), inet_csk_reqsk_queue_add() does not set reqsk->sk and calls inet_child_forget(), which calls tcp_disconnect() for the TFO socket.

After the cited commit, tcp_disconnect() calls reqsk_fastopen_remove(), where reqsk_put() is called due to !reqsk->sk.

Then, reqsk_fastopen_remove() in tcp_conn_request() decrements the last req->rsk_refcnt and frees reqsk, and __reqsk_free() at the drop_and_free label causes the refcount underflow for the listener and double-free of the reqsk.

Let's remove reqsk_fastopen_remove() in tcp_conn_request().

Note that other callers make sure tp->fastopen_rsk is not NULL.

[0]: refcount_t: underflow; use-after-free. WARNING: CPU: 12 PID: 5563 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28) Modules linked in: CPU: 12 UID: 0 PID: 5563 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:refcount_warn_saturate (lib/refcount.c:28) Code: ab e8 8e b4 98 ff 0f 0b c3 cc cc cc cc cc 80 3d a4 e4 d6 01 00 75 9c c6 05 9b e4 d6 01 01 48 c7 c7 e8 df fb ab e8 6a b4 98 ff <0f> 0b e9 03 5b 76 00 cc 80 3d 7d e4 d6 01 00 0f 85 74 ff ff ff c6 RSP: 0018:ffffa79fc0304a98 EFLAGS: 00010246 RAX: d83af4db1c6b3900 RBX: ffff9f65c7a69020 RCX: d83af4db1c6b3900 RDX: 0000000000000000 RSI: 00000000ffff7fff RDI: ffffffffac78a280 RBP: 000000009d781b60 R08: 0000000000007fff R09: ffffffffac6ca280 R10: 0000000000017ffd R11: 0000000000000004 R12: ffff9f65c7b4f100 R13: ffff9f65c7d23c00 R14: ffff9f65c7d26000 R15: ffff9f65c7a64ef8 FS: 00007f9f962176c0(0000) GS:ffff9f65fcf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000180 CR3: 000000000dbbe006 CR4: 0000000000372ef0 Call Trace: tcp_conn_request (./include/linux/refcount.h:400 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/sock.h:1965 ./include/net/request_sock.h:131 net/ipv4/tcp_input.c:7301) tcp_rcv_state_process (net/ipv4/tcp_input.c:6708) tcp_v6_do_rcv (net/ipv6/tcp_ipv6.c:1670) tcp_v6_rcv (net/ipv6/tcp_ipv6.c:1906) ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:438) ip6_input (net/ipv6/ip6_input.c:500) ipv6_rcv (net/ipv6/ip6_input.c:311) __netif_receive_skb (net/core/dev.c:6104) process_backlog (net/core/dev.c:6456) __napi_poll (net/core/dev.c:7506) net_rx_action (net/core/dev.c:7569 net/core/dev.c:7696) handle_softirqs (kernel/softirq.c:579) do_softirq (kernel/softirq.c:480)

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity81% × 45%
Impact severity (EG Severity): CVSS 8.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
47th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.

EG Severity
8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

November 12, 2025

Last Modified

October 19, 2026

Advisory Details (8)

Auto-updated Jul 30, 2026
Patch available.
Web page

tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ff6a8883f96a5bc74241ce5b3d431a6dcfa2124d
Web page

tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eb85ad5f23268d64b037bfb545cbcba3752f90c7
Web page

tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e359b742eac1eac75cff4e38ee2e8cea492acd9b
Web page

tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c11ace909e873118295e9eb22dc8c58b0b50eb32
Web page

tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/64dc47a13aa3d9daf7cec29b44dca8e22a6aea15
Web page

tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/643a94b0cf767325e953591c212be2eb826b9d7f
Web page

tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/422c1c173c39bbbae1e0eaaf8aefe40b2596233b
Web page

tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2e7cbbbe3d61c63606994b7ff73c72537afe2e1c

Vendor Advisories for CVE-2025-40186(13)

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

Patch Availability(18)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-oracle-64k-6.17 (6.17.0-1007.7) @ questing2026-10-27ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-14.14) @ questing2026-10-27ubuntu
ubuntulinux-tools-gcp-64k-6.17 (6.17.0-1007.7) @ questing2026-10-27ubuntu
ubuntulinux-tools-oem-6.17 (6.17.0-1011.11) @ noble2026-10-27ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1008.8) @ questing2026-10-27ubuntu
redhatkernel-0:5.14.0-70.158.1.el9_02025-12-17redhat
redhatkernel-0:4.18.0-372.173.1.el8_62025-12-17redhat
redhatkernel-0:5.14.0-427.103.1.el9_42025-12-17redhat
redhatkernel-rt-0:5.14.0-70.158.1.rt21.230.el9_02025-12-17redhat
redhatkernel-0:5.14.0-284.150.1.el9_22025-12-17redhat
redhatkernel-rt-0:5.14.0-284.150.1.rt14.435.el9_22025-12-17redhat
redhatkernel-0:4.18.0-193.178.1.el8_22025-12-17redhat
redhatkernel-0:4.18.0-305.182.1.el8_42025-12-17redhat
redhatkernel-0:4.18.0-477.123.1.el8_82025-12-17redhat
redhatkernel-rt-0:4.18.0-553.87.1.rt7.428.el8_102025-12-01redhat
redhatkernel-0:4.18.0-553.87.1.el8_102025-12-01redhat
redhatkernel-0:5.14.0-570.69.1.el9_62025-12-01redhat
linuxKernel @ 5.4.301 (fixes >=0)—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

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (47 versions)
  • every version up to 5.10.247-1: fixed in 5.10.247-1
—
linux-6.16.1.106-3~deb11u1 ... 6.1.153-1~deb11u1 (12 versions)
  • every version up to 6.1.158-1~deb11u1: fixed in 6.1.158-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (44 versions)
  • every version up to 6.1.158-1: fixed in 6.1.158-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.57-1~bpo12+1 (6 versions)
  • every version up to 6.12.57-1: fixed in 6.12.57-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.17.5-1~exp1 (75 versions)
  • every version up to 6.17.6-1: fixed in 6.17.6-1
—

Additional Vendor Advisories

(5)

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 11× in last 7d / 47× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 231 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 133 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  2. 2026-10-29 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  3. 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  4. 2026-10-27 18:54 UTCEG score recompute
  5. 2026-10-27 18:54 UTCVendor advisory
  6. 2026-10-27 18:54 UTCGHSA enrichmentGHSA-qx52-pj36-489j · GitHub severity HIGH · GitHub CVSS 8.1
  7. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  9. 2026-10-25 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  10. 2026-10-25 16:28 UTCEG score recompute
  11. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  12. 2026-10-23 16:30 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  13. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  14. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  15. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  16. 2026-10-19 21:27 UTCEG score recompute
  17. 2026-10-19 21:27 UTCVendor advisory
  18. 2026-10-19 21:26 UTCGHSA enrichmentGHSA-qx52-pj36-489j · GitHub severity HIGH · GitHub CVSS 8.1
  19. 2026-10-19 16:30 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  20. 2026-10-18 16:30 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  21. 2026-10-18 05:34 UTCEG score recompute
  22. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  23. 2026-10-16 16:38 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  24. 2026-10-15 22:49 UTCEG score recompute
  25. 2026-10-15 22:49 UTCVendor advisory
Show 73 more
  1. 2026-10-15 22:49 UTCGHSA enrichmentGHSA-qx52-pj36-489j · GitHub severity HIGH · GitHub CVSS 8.1
  2. 2026-10-15 22:10 UTCEG score recompute
  3. 2026-10-15 22:10 UTCVendor advisory
  4. 2026-10-15 22:10 UTCGHSA enrichmentGHSA-qx52-pj36-489j · GitHub severity HIGH · GitHub CVSS 8.1
  5. 2026-10-15 16:30 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  6. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  7. 2026-10-13 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  8. 2026-10-12 17:06 UTCEG score recompute
  9. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-11 20:38 UTCEG score recompute
  11. 2026-10-11 18:50 UTCEG score recompute
  12. 2026-10-11 15:27 UTCEG score recompute
  13. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-08 17:09 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-10-06 15:16 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  25. 2026-09-27 02:12 UTCOSV refresh
  26. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  27. 2026-09-26 00:24 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  28. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  29. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  30. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  31. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  32. 2026-09-17 19:29 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  33. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  34. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  35. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  36. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  37. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  38. 2026-09-11 09:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  39. 2026-09-10 09:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  40. 2026-09-08 21:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  41. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  42. 2026-09-07 11:18 UTCOSV refresh
  43. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  44. 2026-09-04 05:05 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  45. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  46. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  47. 2026-09-01 04:38 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  48. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  49. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  50. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  51. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  52. 2026-08-26 14:45 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  53. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  54. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  55. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  56. 2026-08-20 22:54 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  57. 2026-08-20 20:31 UTCOSV refresh
  58. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  59. 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  60. 2026-08-17 13:46 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  61. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  62. 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  63. 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  64. 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  65. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  66. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  67. 2026-08-08 16:36 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  68. 2026-08-07 16:26 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  69. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  70. 2026-08-05 12:52 UTCEG score recompute
  71. 2026-08-05 12:52 UTCVendor advisory
  72. 2026-08-05 12:52 UTCGHSA enrichmentGHSA-qx52-pj36-489j · GitHub severity HIGH · GitHub CVSS 8.1
  73. 2026-08-04 15:09 UTCEPSS rescoreEPSS 0.5% · 42nd percentile

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2025-40186?
CVE-2025-40186 is a high-severity vulnerability; its CVE record was published on November 12, 2025. In the Linux kernel, the following vulnerability has been resolved: tcp: Don't call reqskfastopenremove() in tcpconnrequest(). syzbot reported the splat below in tcpconnrequest(). [0] If a listener is close()d while a TFO socket is being processed in tcpconnrequest(), inetcskreqskqueueadd() does…
When was the CVE record for CVE-2025-40186 published?
The CVE record for CVE-2025-40186 was published on November 12, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 19, 2026; the record at its source may have been updated since.
Is CVE-2025-40186 actively exploited?
CVE-2025-40186 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-40186?
CVE-2025-40186 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2025-40186?
A fix for CVE-2025-40186 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-40186 are linked in the Vendor Advisories panel on this page.

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