CVE-2025-71126

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-01-14. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

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

mptcp: avoid deadlock on fallback while reinjecting

Jakub reported an MPTCP deadlock at fallback time:

WARNING: possible recursive locking detected 6.18.0-rc7-virtme #1 Not tainted -------------------------------------------- mptcp_connect/20858 is trying to acquire lock: ff1100001da18b60 (&msk->fallback_lock){+.-.}-{3:3}, at: __mptcp_try_fallback+0xd8/0x280

but task is already holding lock: ff1100001da18b60 (&msk->fallback_lock){+.-.}-{3:3}, at: __mptcp_retrans+0x352/0xaa0

other info that might help us debug this: Possible unsafe locking scenario:

CPU0 ---- lock(&msk->fallback_lock); lock(&msk->fallback_lock);

* DEADLOCK *

May be due to missing lock nesting notation

3 locks held by mptcp_connect/20858: #0: ff1100001da18290 (sk_lock-AF_INET){+.+.}-{0:0}, at: mptcp_sendmsg+0x114/0x1bc0 #1: ff1100001db40fd0 (k-sk_lock-AF_INET#2){+.+.}-{0:0}, at: __mptcp_retrans+0x2cb/0xaa0 #2: ff1100001da18b60 (&msk->fallback_lock){+.-.}-{3:3}, at: __mptcp_retrans+0x352/0xaa0

stack backtrace: CPU: 0 UID: 0 PID: 20858 Comm: mptcp_connect Not tainted 6.18.0-rc7-virtme #1 PREEMPT(full) Hardware name: Bochs, BIOS Bochs 01/01/2011 Call Trace: dump_stack_lvl+0x6f/0xa0 print_deadlock_bug.cold+0xc0/0xcd validate_chain+0x2ff/0x5f0 __lock_acquire+0x34c/0x740 lock_acquire.part.0+0xbc/0x260 _raw_spin_lock_bh+0x38/0x50 __mptcp_try_fallback+0xd8/0x280 mptcp_sendmsg_frag+0x16c2/0x3050 __mptcp_retrans+0x421/0xaa0 mptcp_release_cb+0x5aa/0xa70 release_sock+0xab/0x1d0 mptcp_sendmsg+0xd5b/0x1bc0 sock_write_iter+0x281/0x4d0 new_sync_write+0x3c5/0x6f0 vfs_write+0x65e/0xbb0 ksys_write+0x17e/0x200 do_syscall_64+0xbb/0xfd0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7fa5627cbc5e Code: 4d 89 d8 e8 14 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa RSP: 002b:00007fff1fe14700 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fa5627cbc5e RDX: 0000000000001f9c RSI: 00007fff1fe16984 RDI: 0000000000000005 RBP: 00007fff1fe14710 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff1fe16920 R13: 0000000000002000 R14: 0000000000001f9c R15: 0000000000001f9c

The packet scheduler could attempt a reinjection after receiving an MP_FAIL and before the infinite map has been transmitted, causing a deadlock since MPTCP needs to do the reinjection atomically from WRT fallback.

Address the issue explicitly avoiding the reinjection in the critical scenario. Note that this is the only fallback critical section that could potentially send packets and hit the double-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
1.6%
KEV
Not listed

Published

January 14, 2026

Last Modified

March 25, 2026

References (5)

Patch Availability(20)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-22.22) @ questing2026-05-29ubuntu
ubuntulinux-virtual-6.8 (6.8.0-110.110) @ noble2026-05-29ubuntu
ubuntulinux-tools-raspi-6.17 (6.17.0-1014.14) @ questing2026-05-29ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1054.60+fips1) @ noble2026-05-29ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1029.30) @ noble2026-05-29ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1022.22) @ noble2026-05-29ubuntu
ubuntulinux-tools-realtime-hwe-24.04-edge (6.17.0-1010.11~24.04.1) @ noble2026-05-29ubuntu
ubuntulinux-tools-gcp-64k-6.17 (6.17.0-1012.12) @ questing2026-05-29ubuntu
ubuntulinux-tools-realtime-6.8.1 (6.8.1-1047.48) @ noble2026-05-29ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1054.57+fips1) @ noble2026-05-29ubuntu
ubuntulinux-tools-nvidia-64k-6.8 (6.8.0-1051.54) @ noble2026-05-29ubuntu
ubuntulinux-tools-oracle-64k-6.17 (6.17.0-1011.11) @ questing2026-05-29ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1054.60) @ noble2026-05-29ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1049.50) @ noble2026-05-29ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1052.56) @ noble2026-05-29ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1013.13) @ questing2026-05-29ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1051.54.1) @ noble2026-05-29ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2042.43) @ noble2026-05-29ubuntu
ubuntulinux-tools-gcp-edge (6.8.0-1054.57~22.04.1) @ jammy2026-05-29ubuntu
linuxKernel @ 6.1.160—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.

All Vendor Advisories

(19)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 39× 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.

  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 10:19 UTCOSV refresh
  5. 2026-07-23 03:03 UTCEG score recompute
  6. 2026-07-22 14:08 UTCEPSS rescore
  7. 2026-07-21 15:24 UTCEPSS rescore
  8. 2026-07-20 17:08 UTCEPSS rescore
  9. 2026-07-19 14:30 UTCEPSS rescore
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  13. 2026-07-16 17:02 UTCEPSS rescore
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  15. 2026-07-15 16:57 UTCEPSS rescore
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  17. 2026-07-13 06:12 UTCEPSS rescore
  18. 2026-07-09 19:10 UTCEPSS rescore
  19. 2026-07-08 15:15 UTCEPSS rescore
  20. 2026-07-07 13:46 UTCEPSS rescore
  21. 2026-07-06 16:27 UTCEPSS rescore
  22. 2026-07-06 05:32 UTCOSV refresh
  23. 2026-07-06 02:23 UTCEPSS rescore
  24. 2026-07-05 02:30 UTCEPSS rescore
  25. 2026-07-05 02:30 UTCEPSS rescore
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  1. 2026-07-04 06:31 UTCEPSS rescore
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  3. 2026-07-01 15:06 UTCEPSS rescore
  4. 2026-06-30 23:22 UTCEPSS rescore
  5. 2026-06-30 23:22 UTCEPSS rescore
  6. 2026-06-29 14:06 UTCEPSS rescore
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  8. 2026-06-28 14:07 UTCEPSS rescore
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  10. 2026-06-28 04:56 UTCEPSS rescore
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  12. 2026-06-27 03:08 UTCEPSS rescore
  13. 2026-06-25 13:49 UTCEPSS rescore
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  15. 2026-06-23 21:32 UTCEPSS rescore
  16. 2026-06-21 14:56 UTCEPSS rescore
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  18. 2026-06-21 01:59 UTCEPSS rescore
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  20. 2026-06-19 19:25 UTCEPSS rescore
  21. 2026-06-19 19:25 UTCEPSS rescore
  22. 2026-06-18 17:52 UTCEPSS rescore
  23. 2026-06-18 17:52 UTCEPSS rescore
  24. 2026-06-17 17:53 UTCEPSS rescore
  25. 2026-06-17 17:05 UTCOSV refresh
  26. 2026-06-16 17:52 UTCEPSS rescore
  27. 2026-06-15 17:48 UTCEPSS rescore
  28. 2026-06-14 23:18 UTCEPSS rescore
  29. 2026-06-13 23:00 UTCEPSS rescore
  30. 2026-06-13 23:00 UTCEPSS rescore
  31. 2026-06-12 23:12 UTCEPSS rescore
  32. 2026-06-12 23:12 UTCEPSS rescore
  33. 2026-06-11 14:00 UTCEPSS rescore
  34. 2026-06-10 22:18 UTCEPSS rescore
  35. 2026-06-10 13:22 UTCEPSS rescore
  36. 2026-06-08 14:17 UTCEPSS rescore
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  38. 2026-06-07 15:24 UTCEPSS rescore
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  40. 2026-06-06 13:47 UTCEPSS rescore
  41. 2026-06-06 13:47 UTCEPSS rescore
  42. 2026-06-05 22:47 UTCEPSS rescore
  43. 2026-06-05 22:46 UTCEPSS rescore
  44. 2026-06-05 06:10 UTCEPSS rescore
  45. 2026-06-05 06:10 UTCEPSS rescore
  46. 2026-06-04 13:12 UTCEPSS rescore
  47. 2026-06-04 13:12 UTCEPSS rescore
  48. 2026-06-02 20:13 UTCEPSS rescore
  49. 2026-06-01 13:51 UTCEPSS rescore
  50. 2026-06-01 13:51 UTCEPSS rescore
  51. 2026-05-31 22:30 UTCEPSS rescore
  52. 2026-05-31 22:30 UTCEPSS rescore
  53. 2026-05-31 00:16 UTCEPSS rescore
  54. 2026-05-31 00:16 UTCEPSS rescore
  55. 2026-05-29 15:58 UTCEG score recompute
  56. 2026-05-29 15:58 UTCVendor advisory
  57. 2026-05-29 15:58 UTCGHSA enrichment
  58. 2026-05-29 13:44 UTCEPSS rescore
  59. 2026-05-29 13:44 UTCEPSS rescore

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

Frequently asked(5)

What is CVE-2025-71126?
CVE-2025-71126 is a medium vulnerability published on January 14, 2026. In the Linux kernel, the following vulnerability has been resolved: mptcp: avoid deadlock on fallback while reinjecting Jakub reported an MPTCP deadlock at fallback time: WARNING: possible recursive locking detected 6.18.0-rc7-virtme #1 Not tainted --------------------------------------------…
When was CVE-2025-71126 disclosed?
CVE-2025-71126 was first published in the National Vulnerability Database on January 14, 2026, with the most recent update on March 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-71126 actively exploited?
CVE-2025-71126 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-71126?
CVE-2025-71126 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2025-71126?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-71126, 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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