CVE-2026-53218

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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

netfilter: nft_exthdr: fix register tracking for F_PRESENT flag

nft_exthdr_init() passes user-controlled priv->len to nft_parse_register_store(), which marks that many bytes in the register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT is set, the eval paths write only 1 byte (nft_reg_store8) or 4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4, registers beyond the first are never written, retaining uninitialized stack data from nft_regs.

Bail out if userspace requests too much data when F_PRESENT is set.

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 PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

June 25, 2026

Last Modified

September 8, 2026

Advisory Details (8)

Auto-updated Jul 3, 2026
No patch confirmed yet.
generic

netfilter: nft_exthdr: fix register tracking for F_PRESENT flag - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265
generic

netfilter: nft_exthdr: fix register tracking for F_PRESENT flag - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cd513e43b4b2bd1de39e2367bc4261c699a8652f
generic

netfilter: nft_exthdr: fix register tracking for F_PRESENT flag - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6
generic

netfilter: nft_exthdr: fix register tracking for F_PRESENT flag - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/78069a6d8bc86c9e036eb82c2af4a19cc1871a53
generic

netfilter: nft_exthdr: fix register tracking for F_PRESENT flag - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/772cecf198da732faebb5dcfc46d66a505be8495
generic

netfilter: nft_exthdr: fix register tracking for F_PRESENT flag - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/67b27434c43b68a97becda98c9f0c8cf6cba2134
generic

netfilter: nft_exthdr: fix register tracking for F_PRESENT flag - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/46fc15a044e9938e7ea77786fb37edd2cd74f031
generic

netfilter: nft_exthdr: fix register tracking for F_PRESENT flag - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/19748967d59c31d24d21d40b728570788310b237

Vendor Advisories for CVE-2026-53218(2)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-18ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-18ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-18ubuntu

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

(4)

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 10× in last 7d / 53× 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 214 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-53218?
CVE-2026-53218 is a medium vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: nftexthdr: fix register tracking for FPRESENT flag nftexthdrinit() passes user-controlled priv->len to nftparseregister_store(), which marks that many bytes in the register bitmap as initialized. However, when…
When was CVE-2026-53218 disclosed?
CVE-2026-53218 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53218 actively exploited?
CVE-2026-53218 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 97.4% of all scored CVEs.
What is the CVSS score of CVE-2026-53218?
CVE-2026-53218 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-53218?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53218, 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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