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
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

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
5.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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%
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

Published

June 25, 2026

Last Modified

September 8, 2026

Advisory Details (8)

Auto-updated Jul 3, 2026
Patch available.
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(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-31.31~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-23ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18) @ resolute2026-09-23ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1011.11) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2018.18) @ resolute2026-09-23ubuntu
ubuntulinux-tools-azure-edge (7.0.0-1014.14~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1019.19) @ resolute2026-09-23ubuntu
ubuntulinux-tools-ibm-7.0 (7.0.0-1013.13) @ resolute2026-09-23ubuntu

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 rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)
  • every version up to 5.10.259-1: fixed in 5.10.259-1
—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)
  • every version up to 6.1.176-1~deb11u1: fixed in 6.1.176-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)
  • every version up to 6.1.176-1: fixed in 6.1.176-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)
  • every version up to 6.12.94-1: fixed in 6.12.94-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (146 versions)
  • every version up to 7.0.13-1: fixed in 7.0.13-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(10)

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 6× in last 7d / 34× 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 234 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 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 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-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?
A fix for CVE-2026-53218 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53218 are linked in the Vendor Advisories panel on this page.

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