CVE-2026-53228

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-25. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — Patch released this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

ipv6: sit: reload inner IPv6 header after GSO offloads

ipip6_tunnel_xmit() caches the inner IPv6 header pointer at function entry and continues using it after iptunnel_handle_offloads().

For GSO skbs, iptunnel_handle_offloads() calls skb_header_unclone(). When the skb header is cloned, skb_header_unclone() can call pskb_expand_head(), which may move the skb head. The pskb_expand_head() contract requires pointers into the skb header to be reloaded after the call.

If the later skb_realloc_headroom() branch is not taken, SIT uses the stale iph6 pointer to read the inner hop limit and DS field. That can read from a freed skb head after the old head's remaining clone is released.

Reload iph6 after the offload helper succeeds and before subsequent reads from the inner IPv6 header. Keep the existing reload after skb_realloc_headroom(), since that branch can also replace the skb.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

June 25, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

ipv6: sit: reload inner IPv6 header after GSO offloads - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f0e42f0c4337b1f220de1ddd63f47197c7dee4de
generic

ipv6: sit: reload inner IPv6 header after GSO offloads - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c
generic

ipv6: sit: reload inner IPv6 header after GSO offloads - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2fa49b2715e1bad12ce3b0fa64e234d9582c8193
generic

ipv6: sit: reload inner IPv6 header after GSO offloads - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/59f80c919713250fe5d25a4d9aea4e49580fa1d4
generic

ipv6: sit: reload inner IPv6 header after GSO offloads - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0
generic

ipv6: sit: reload inner IPv6 header after GSO offloads - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9c67b44edb3598d234efae6e44649eb993c03da5
generic

ipv6: sit: reload inner IPv6 header after GSO offloads - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1132e5edc2866c3530be17622153a597095f0e43
generic

ipv6: sit: reload inner IPv6 header after GSO offloads - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fddd41445a0537b093e6b3f6232c9933cad1e48b

Vendor Advisories for CVE-2026-53228(3)

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

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.254.238) @ bionic2026-09-18ubuntu
ubuntulinux-tools-azure (4.15.0.1205.220~14.04.1) @ trusty2026-09-18ubuntu
ubuntulinux-virtual-6.17 (6.17.0-42.42) @ noble2026-09-18ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-29.29) @ resolute2026-09-18ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1034.35) @ noble2026-09-18ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1059.62) @ noble2026-09-18ubuntu
ubuntulinux-tools-nvidia-tegra-igx-rt-5.15 (5.15.0.1054.56) @ jammy2026-09-18ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1080 (5.4.0-1080.84) @ focal2026-09-18ubuntu
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.254.266~16.04.1) @ xenial2026-09-18ubuntu
ubuntulinux-tools-aws-edge (7.0.0-1010.10~24.04.1) @ noble2026-09-18ubuntu
ubuntulinux-tools-oracle (4.15.0.1158.169~16.04.1) @ xenial2026-09-18ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-29.29~24.04.2) @ noble2026-09-18ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1059.62~22.04.1) @ jammy2026-09-18ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-138.138~22.04.1) @ jammy2026-09-18ubuntu
ubuntulinux-tools-gke-hwe-26.04 (7.0.0-1005.6) @ resolute2026-09-18ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1062.65~22.04.2) @ jammy2026-09-18ubuntu
ubuntulinux-tools-fips (4.4.0.1127.129) @ xenial2026-09-18ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.190.200~20.04.1) @ focal2026-09-18ubuntu
ubuntulinux-virtual-lts-xenial (4.4.0.284.290) @ xenial2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16~24.04.1) @ noble2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-09-18ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (5.15.0.190.157) @ jammy2026-09-18ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2051.53) @ noble2026-09-18ubuntu
ubuntulinux-tools-azure-fips-5.4 (5.4.0.1167.103) @ focal2026-09-18ubuntu
ubuntulinux-tools-gke-5.15 (5.15.0.1110.109) @ jammy2026-09-18ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1114.124~20.04.1) @ focal2026-09-18ubuntu
ubuntulinux-tools-oracle-edge (5.4.0.1161.171~18.04.1) @ bionic2026-09-18ubuntu
redhatkernel-rt-0:4.18.0-553.164.1.rt7.505.el8_102026-09-17redhat
redhatkernel-0:4.18.0-553.164.1.el8_102026-09-17redhat
redhatkernel-0:6.12.0-211.52.1.el10_22026-09-08redhat

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—

Additional Vendor Advisories

(23)

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 23× in last 7d / 105× 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 653 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-53228?
CVE-2026-53228 is a critical vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: ipv6: sit: reload inner IPv6 header after GSO offloads ipip6tunnelxmit() caches the inner IPv6 header pointer at function entry and continues using it after iptunnelhandleoffloads(). For GSO skbs, iptunnelhandleoffloads() calls…
When was CVE-2026-53228 disclosed?
CVE-2026-53228 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-2026-53228 actively exploited?
CVE-2026-53228 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.2% of all scored CVEs.
What is the CVSS score of CVE-2026-53228?
CVE-2026-53228 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-53228?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53228, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53228

Explore →

Is Your Infrastructure Affected by CVE-2026-53228?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs