CVE-2025-37921

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-05-20. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

vxlan: vnifilter: Fix unlocked deletion of default FDB entry

When a VNI is deleted from a VXLAN device in 'vnifilter' mode, the FDB entry associated with the default remote (assuming one was configured) is deleted without holding the hash lock. This is wrong and will result in a warning [1] being generated by the lockdep annotation that was added by commit ebe642067455 ("vxlan: Create wrappers for FDB lookup").

Reproducer:

# ip link add vx0 up type vxlan dstport 4789 external vnifilter local 192.0.2.1 # bridge vni add vni 10010 remote 198.51.100.1 dev vx0 # bridge vni del vni 10010 dev vx0

Fix by acquiring the hash lock before the deletion and releasing it afterwards. Blame the original commit that introduced the issue rather than the one that exposed it.

[1] WARNING: CPU: 3 PID: 392 at drivers/net/vxlan/vxlan_core.c:417 vxlan_find_mac+0x17f/0x1a0 [...] RIP: 0010:vxlan_find_mac+0x17f/0x1a0 [...] Call Trace: __vxlan_fdb_delete+0xbe/0x560 vxlan_vni_delete_group+0x2ba/0x940 vxlan_vni_del.isra.0+0x15f/0x580 vxlan_process_vni_filter+0x38b/0x7b0 vxlan_vnifilter_process+0x3bb/0x510 rtnetlink_rcv_msg+0x2f7/0xb70 netlink_rcv_skb+0x131/0x360 netlink_unicast+0x426/0x710 netlink_sendmsg+0x75a/0xc20 __sock_sendmsg+0xc1/0x150 ____sys_sendmsg+0x5aa/0x7b0 ___sys_sendmsg+0xfc/0x180 __sys_sendmsg+0x121/0x1b0 do_syscall_64+0xbb/0x1d0 entry_SYSCALL_64_after_hwframe+0x4b/0x53

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

May 20, 2025

Last Modified

August 5, 2026

Advisory Details (6)

Auto-updated Jul 30, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 4271-1] linux-6.1 security update

https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
generic

vxlan: vnifilter: Fix unlocked deletion of default FDB entry - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5cb9e07f84e527974b12e82e2549fa6c0cc6eef0
generic

vxlan: vnifilter: Fix unlocked deletion of default FDB entry - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/470206205588559e60035fceb5f256640cb45f99
generic

vxlan: vnifilter: Fix unlocked deletion of default FDB entry - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3576e9a80b6c4381b01ce0cbaa07f5e92d4492ed
generic

vxlan: vnifilter: Fix unlocked deletion of default FDB entry - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2d4a121296aa3940d2df9906f955c2b6b4e38bc3
generic

vxlan: vnifilter: Fix unlocked deletion of default FDB entry - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/087a9eb9e5978e3ba362e1163691e41097e8ca20

Vendor Advisories for CVE-2025-37921(1)

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

Patch Availability(23)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (6.14.0-24.24) @ plucky2026-07-30ubuntu
ubuntulinux-tools-oem-6.14 (6.14.0-1007.7) @ noble2026-07-30ubuntu
ubuntulinux-tools-oracle-64k-6.14 (6.14.0-1009.9) @ plucky2026-07-30ubuntu
ubuntulinux-tools-aws-edge (6.14.0-1009.9~24.04.1) @ noble2026-07-30ubuntu
ubuntulinux-tools-aws-64k-6.14 (6.14.0-1009.9) @ plucky2026-07-30ubuntu
ubuntulinux-virtual-6.8 (6.8.0-100.100) @ noble2026-07-30ubuntu
ubuntulinux-tools-gcp-edge (6.8.0-1047.50~22.04.2) @ jammy2026-07-30ubuntu
ubuntulinux-tools-azure-6.14 (6.14.0-1010.10) @ plucky2026-07-30ubuntu
ubuntulinux-tools-realtime-hwe-22.04 (6.8.1-1041.42~22.04.1) @ jammy2026-07-30ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1043.44~22.04.1) @ jammy2026-07-30ubuntu
ubuntulinux-tools-realtime-6.8.1 (6.8.1-1041.42) @ noble2026-07-30ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-100.100+fips1) @ noble2026-07-30ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1047.50+fips1) @ noble2026-07-30ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-100.100~22.04.1) @ jammy2026-07-30ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-100.100.1) @ noble2026-07-30ubuntu
ubuntulinux-tools-gke-64k-6.8 (6.8.0-1043.48) @ noble2026-07-30ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1051.57~22.04.1) @ jammy2026-07-30ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1046.52) @ noble2026-07-30ubuntu
ubuntulinux-tools-ibm-lts-24.04 (6.8.0-1044.44) @ noble2026-07-30ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1046.49.1) @ noble2026-07-30ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1046.52+fips1) @ noble2026-07-30ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1023.24) @ noble2026-07-30ubuntu
linuxKernel @ 6.1.138—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.

Additional Vendor Advisories

(22)

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 8× in last 7d / 41× 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 106 total refreshes for this CVE.

  1. 2026-08-07 16:26 UTCEPSS rescore
  2. 2026-08-06 13:46 UTCEPSS rescore
  3. 2026-08-05 13:55 UTCEG score recompute
  4. 2026-08-05 13:55 UTCVendor advisory
  5. 2026-08-05 13:55 UTCGHSA enrichment
  6. 2026-08-04 15:09 UTCEPSS rescore
  7. 2026-08-03 10:35 UTCEPSS rescore
  8. 2026-08-02 02:26 UTCEPSS rescore
  9. 2026-08-01 04:15 UTCEPSS rescore
  10. 2026-07-30 16:27 UTCEPSS rescore
  11. 2026-07-30 07:11 UTCEG score recompute
  12. 2026-07-30 07:11 UTCVendor advisory
  13. 2026-07-30 07:10 UTCGHSA enrichment
  14. 2026-07-30 01:29 UTCEPSS rescore
  15. 2026-07-28 15:35 UTCEPSS rescore
  16. 2026-07-26 14:54 UTCEPSS rescore
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  20. 2026-07-24 05:41 UTCOSV refresh
  21. 2026-07-23 02:54 UTCEG score recompute
  22. 2026-07-22 14:07 UTCEPSS rescore
  23. 2026-07-22 14:07 UTCEPSS rescore
  24. 2026-07-21 15:24 UTCEPSS rescore
  25. 2026-07-20 17:07 UTCEPSS rescore
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  1. 2026-07-19 14:30 UTCEPSS rescore
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  5. 2026-07-16 17:02 UTCEPSS rescore
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  8. 2026-07-15 01:59 UTCEPSS rescore
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  10. 2026-07-13 22:29 UTCEPSS rescore
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  12. 2026-07-13 06:12 UTCEPSS rescore
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  15. 2026-07-09 19:09 UTCEPSS rescore
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  17. 2026-07-07 13:45 UTCEPSS rescore
  18. 2026-07-07 01:21 UTCOSV refresh
  19. 2026-07-06 16:27 UTCEPSS rescore
  20. 2026-07-06 16:27 UTCEPSS rescore
  21. 2026-07-05 02:30 UTCEPSS rescore
  22. 2026-07-04 06:30 UTCEPSS rescore
  23. 2026-07-01 15:06 UTCEPSS rescore
  24. 2026-07-01 15:06 UTCEPSS rescore
  25. 2026-06-30 23:22 UTCEPSS rescore
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  27. 2026-06-29 14:06 UTCEPSS rescore
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  31. 2026-06-28 04:55 UTCEPSS rescore
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  39. 2026-06-23 21:32 UTCEPSS rescore
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  41. 2026-06-22 14:25 UTCEPSS rescore
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  45. 2026-06-21 01:59 UTCEPSS rescore
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  47. 2026-06-19 19:25 UTCEPSS rescore
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  49. 2026-06-18 17:52 UTCEPSS rescore
  50. 2026-06-18 17:52 UTCEPSS rescore
  51. 2026-06-18 12:05 UTCOSV refresh
  52. 2026-06-17 17:52 UTCEPSS rescore
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  55. 2026-06-14 23:17 UTCEPSS rescore
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  63. 2026-06-07 15:24 UTCEPSS rescore
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  73. 2026-06-01 13:51 UTCEPSS rescore
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  75. 2026-05-31 22:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-37921?
CVE-2025-37921 is a high vulnerability published on May 20, 2025. In the Linux kernel, the following vulnerability has been resolved: vxlan: vnifilter: Fix unlocked deletion of default FDB entry When a VNI is deleted from a VXLAN device in 'vnifilter' mode, the FDB entry associated with the default remote (assuming one was configured) is deleted without holding…
When was CVE-2025-37921 disclosed?
CVE-2025-37921 was first published in the National Vulnerability Database on May 20, 2025, 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-2025-37921 actively exploited?
CVE-2025-37921 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 92.8% of all scored CVEs.
What is the CVSS score of CVE-2025-37921?
CVE-2025-37921 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2025-37921?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-37921, 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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