CVE-2026-53212

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
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:

netfilter: nft_tunnel: fix use-after-free on object destroy

nft_tunnel_obj_destroy() calls metadata_dst_free() which directly kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets that took a reference via dst_hold() in nft_tunnel_obj_eval() and are still queued (e.g. in a netem qdisc) are left with a dangling pointer. When these packets are eventually dequeued, dst_release() operates on freed memory.

Replace metadata_dst_free() with dst_release() so the metadata_dst is freed only after all references are dropped. The dst subsystem already handles metadata_dst cleanup in dst_destroy() when DST_METADATA is set.

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
5%
KEV
Not listed

Published

June 25, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Jun 28, 2026
No patch confirmed yet.
generic

netfilter: nft_tunnel: fix use-after-free on object destroy - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e
generic

netfilter: nft_tunnel: fix use-after-free on object destroy - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43
generic

netfilter: nft_tunnel: fix use-after-free on object destroy - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a
generic

netfilter: nft_tunnel: fix use-after-free on object destroy - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3
generic

netfilter: nft_tunnel: fix use-after-free on object destroy - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842
generic

netfilter: nft_tunnel: fix use-after-free on object destroy - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82
generic

netfilter: nft_tunnel: fix use-after-free on object destroy - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef
generic

netfilter: nft_tunnel: fix use-after-free on object destroy - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05

Vendor Advisories for CVE-2026-53212(2)

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

Patch Availability(27)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1076 (5.15.0-1076.80) @ jammy2026-08-30ubuntu
ubuntulinux-virtual-6.17 (6.17.0-42.42) @ noble2026-08-30ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1059.62) @ noble2026-08-30ubuntu
ubuntulinux-tools-nvidia-tegra-igx-rt-5.15 (5.15.0.1054.56) @ jammy2026-08-30ubuntu
ubuntulinux-tools-aws-edge (7.0.0-1010.10~24.04.1) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-fde-edge (5.15.0.1118.127~20.04.1) @ focal2026-08-30ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-29.29~24.04.2) @ noble2026-08-30ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1059.62~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-oracle-64k-6.17 (6.17.0-1020.20) @ noble2026-08-30ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-138.138~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-gke-hwe-26.04 (7.0.0-1005.6) @ resolute2026-08-30ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1062.65~22.04.2) @ jammy2026-08-30ubuntu
ubuntulinux-tools-gcp-lts-22.04 (5.15.0.1114.111) @ jammy2026-08-30ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2051.53) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-fips-5.4 (5.4.0.1167.103) @ focal2026-08-30ubuntu
ubuntulinux-tools-gke-5.15 (5.15.0.1110.109) @ jammy2026-08-30ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1080 (5.4.0-1080.84) @ focal2026-08-30ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-29.29) @ resolute2026-08-30ubuntu
ubuntulinux-tools-realtime-hwe-22.04 (6.8.1-1057.58~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-08-30ubuntu
ubuntulinux-tools-gcp-fips-5.4 (5.4.0.1165.107) @ focal2026-08-30ubuntu
ubuntulinux-tools-kvm-5.4 (5.4.0.1149.145) @ focal2026-08-30ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1110.106) @ jammy2026-08-30ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1010.10) @ resolute2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-24.04 (6.17.0-1031.31) @ noble2026-08-30ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (5.15.0.190.157) @ jammy2026-08-30ubuntu

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 rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (145 versions)7.0.13-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(24)

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 5× in last 7d / 87× 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 296 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-53212?
CVE-2026-53212 is a high vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_tunnel: fix use-after-free on object destroy nfttunnelobjdestroy() calls metadatadst_free() which directly kfree()s the metadatadst, ignoring the dstentry refcount. Packets that took a reference via dsthold() in…
When was CVE-2026-53212 disclosed?
CVE-2026-53212 was first published in the National Vulnerability Database on June 25, 2026, 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-2026-53212 actively exploited?
CVE-2026-53212 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 95.5% of all scored CVEs.
What is the CVSS score of CVE-2026-53212?
CVE-2026-53212 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-53212?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53212, 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.

Dependency Blast Radius

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