CVE-2026-74693 (GCVE-0-2026-74693)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-22 15:32
VLAI
Title
net: prestera: validate firmware header length
Summary
In the Linux kernel, the following vulnerability has been resolved: net: prestera: validate firmware header length prestera_fw_hdr_parse() reads the firmware header before checking that the firmware image contains that header. Reject images shorter than struct prestera_fw_header before decoding the magic and version fields.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4c2703dfd7fabb0824b3bc345f9fa47e33248c14 , < 38a3afbf9fd8a2e8c47fa3ca47b425a8a9623240 (git)
Affected: 4c2703dfd7fabb0824b3bc345f9fa47e33248c14 , < 0fbcceb9d19f2d1dcdf099aee590f2517cb718bb (git)
Affected: 4c2703dfd7fabb0824b3bc345f9fa47e33248c14 , < e0f382e8084117f0b11ffb070fe1079e38c0d7f9 (git)
Affected: 4c2703dfd7fabb0824b3bc345f9fa47e33248c14 , < 6fad06bb793d7089ae05b9fcf46e11be2dfe4850 (git)
Affected: 4c2703dfd7fabb0824b3bc345f9fa47e33248c14 , < 470ac9cce7308e60cf2dceb448749cdd006e73de (git)
Affected: 4c2703dfd7fabb0824b3bc345f9fa47e33248c14 , < 363e048a9d0a6c245cbc348c8a220170afed046a (git)
Affected: 4c2703dfd7fabb0824b3bc345f9fa47e33248c14 , < 7fa8a12296d8d5aa4b1c3904f0b354d81124cf29 (git)
Affected: 4c2703dfd7fabb0824b3bc345f9fa47e33248c14 , < 8ae344eb540af3f457179b52bc6061416752485c (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "cpeApplicability": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: prestera: validate firmware header length\n\nprestera_fw_hdr_parse() reads the firmware header before checking\nthat the firmware image contains that header.\n\nReject images shorter than struct prestera_fw_header before decoding the\nmagic and version fields."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:32:56.491Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-08-22T15:32:56.491Z",
    "dateReserved": "2026-08-15T05:44:03.926Z",
    "dateUpdated": "2026-08-22T15:32:56.491Z",
    "state": "PUBLISHED"
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      "date": "2026-08-29",
      "epss": "0.00177",
      "percentile": "0.07274"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-74693",
      "id": "msrc_CVE-2026-74693",
      "initial_release_date": "2026-08-24T01:04:40.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: prestera: validate firmware header length",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74693.json",
      "version": "2"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-24T12:19:27+00:00",
      "cve": "CVE-2026-74693",
      "id": "CVE-2026-74693",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: prestera: validate firmware header length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74693.json",
      "version": "3"
    }
  }
}



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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.