CVE-2026-43374

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-08. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 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:

net: nexthop: fix percpu use-after-free in remove_nh_grp_entry

When removing a nexthop from a group, remove_nh_grp_entry() publishes the new group via rcu_assign_pointer() then immediately frees the removed entry's percpu stats with free_percpu(). However, the synchronize_net() grace period in the caller remove_nexthop_from_groups() runs after the free. RCU readers that entered before the publish still see the old group and can dereference the freed stats via nh_grp_entry_stats_inc() -> get_cpu_ptr(nhge->stats), causing a use-after-free on percpu memory.

Fix by deferring the free_percpu() until after synchronize_net() in the caller. Removed entries are chained via nh_list onto a local deferred free list. After the grace period completes and all RCU readers have finished, the percpu stats are safely freed.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
2.6%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 15, 2026

Advisory Details (4)

Auto-updated May 11, 2026
No patch confirmed yet.
generic

net: nexthop: fix percpu use-after-free in remove_nh_grp_entry - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b2662e7593e94ae09b1cf7ee5f09160a3612bcb2
generic

net: nexthop: fix percpu use-after-free in remove_nh_grp_entry - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/abf4feaee6405f1441929c6ebe7a250f2cd170a7
generic

net: nexthop: fix percpu use-after-free in remove_nh_grp_entry - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ab5ebab9664214ba41a7633cb4e72f128204f924
generic

net: nexthop: fix percpu use-after-free in remove_nh_grp_entry - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9e08ad731862b22a87cc55f752e16d66cdc9e231

Vendor Advisories for CVE-2026-43374(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 38× 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 133 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-43374?
CVE-2026-43374 is a high vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: net: nexthop: fix percpu use-after-free in removenhgrp_entry When removing a nexthop from a group, removenhgrp_entry() publishes the new group via rcuassignpointer() then immediately frees the removed entry's percpu stats with…
When was CVE-2026-43374 disclosed?
CVE-2026-43374 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43374 actively exploited?
CVE-2026-43374 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43374?
CVE-2026-43374 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-43374?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43374, 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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