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

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:

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
2%
KEV
Not listed

Published

June 25, 2026

Last Modified

July 2, 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.

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 (142 versions)7.0.13-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 95× 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 177 total refreshes for this CVE.

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

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 July 2, 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 97.8% 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.

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