CVE-2026-53218 (GCVE-0-2026-53218)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
Title
netfilter: nft_exthdr: fix register tracking for F_PRESENT flag
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 , < 8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6 (git)
Affected: c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 , < 19748967d59c31d24d21d40b728570788310b237 (git)
Affected: c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 , < 46fc15a044e9938e7ea77786fb37edd2cd74f031 (git)
Affected: c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 , < cd513e43b4b2bd1de39e2367bc4261c699a8652f (git)
Affected: c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 , < 67b27434c43b68a97becda98c9f0c8cf6cba2134 (git)
Affected: c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 , < 78069a6d8bc86c9e036eb82c2af4a19cc1871a53 (git)
Affected: c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 , < f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265 (git)
Affected: c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 , < 772cecf198da732faebb5dcfc46d66a505be8495 (git)
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Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_exthdr: fix register tracking for F_PRESENT flag\n\nnft_exthdr_init() passes user-controlled priv-\u003elen to\nnft_parse_register_store(), which marks that many bytes in the\nregister bitmap as initialized.  However, when NFT_EXTHDR_F_PRESENT\nis set, the eval paths write only 1 byte (nft_reg_store8) or\n4 bytes (*dest = 0 on TCP/DCCP error path).  When len \u003e 4,\nregisters beyond the first are never written, retaining\nuninitialized stack data from nft_regs.\n\nBail out if userspace requests too much data when F_PRESENT is set."
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      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:21.069Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-06-25T08:39:21.069Z",
    "dateReserved": "2026-06-09T07:44:35.392Z",
    "dateUpdated": "2026-06-25T08:39:21.069Z",
    "state": "PUBLISHED"
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      "date": "2026-07-01",
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.