CVE-2026-74475 (GCVE-0-2026-74475)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37
VLAI
Title
vxlan: use neigh_ha_snapshot() in route_shortcircuit()
Summary
In the Linux kernel, the following vulnerability has been resolved: vxlan: use neigh_ha_snapshot() in route_shortcircuit() The neighbour hardware address n->ha can be updated asynchronously by the neighbour subsystem, protected by n->ha_lock seqlock. Reading n->ha without holding the seqlock loop can lead to torn reads or reading a partially updated MAC address. Use neigh_ha_snapshot() in route_shortcircuit() to safely copy n->ha under read_seqbegin()/read_seqretry() lock protection before using it. Note that arp_reduce() and neigh_reduce() seem to have the same issue left for future patches.
Severity
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e4f67addf158f98f8197e08974966b18480dc751 , < 32a9590a8d30426e3db63e6b20893e47e02576c0 (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < d0993fc053f29e15cc7c9fe2029df3882a2ab5ab (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < 87210054bad82bbae6f483a742dc45722fb47a6b (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0 (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < ec341bb76d77b4c2948764375ee6bfeef4bb41c3 (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < ff89415d34c3ab9f5312316423122e664ed3524f (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < 05f2987f73daa05333fd713d05546142f9f7c5f0 (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < 8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use neigh_ha_snapshot() in route_shortcircuit()\n\nThe neighbour hardware address n-\u003eha can be updated asynchronously by the\nneighbour subsystem, protected by n-\u003eha_lock seqlock. Reading n-\u003eha without\nholding the seqlock loop can lead to torn reads or reading a partially updated\nMAC address.\n\nUse neigh_ha_snapshot() in route_shortcircuit() to safely copy n-\u003eha under\nread_seqbegin()/read_seqretry() lock protection before using it.\n\nNote that arp_reduce() and neigh_reduce() seem to have the same issue\nleft for future patches."
          }
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        "lastModified": "2026-08-19T17:21:04.787",
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                "baseScore": 10.0,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L",
                "version": "3.1"
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        "published": "2026-08-15T13:17:52.293",
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        "vulnStatus": "Received"
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    "redhat_vex": {
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      "current_release_date": "2026-08-17T14:55:40+00:00",
      "cve": "CVE-2026-74475",
      "id": "CVE-2026-74475",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vxlan: use neigh_ha_snapshot() in route_shortcircuit()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74475.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-15T01:20:30Z",
      "cve": "CVE-2026-74475",
      "id": "CVE-2026-74475",
      "initial_release_date": "2026-08-15T23:52:12Z",
      "product_status:known_affected": "358",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74475",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74475.json",
      "version": "7"
    }
  }
}



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Taxonomy of the tags.





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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.