CVE-2026-64000 (GCVE-0-2026-64000)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:56 – Updated: 2026-08-05 12:38
VLAI
Title
net: hsr: fix potential OOB access in supervision frame handling
Summary
In the Linux kernel, the following vulnerability has been resolved: net: hsr: fix potential OOB access in supervision frame handling Ensure the entire TLV header is linearized before access by adding sizeof(struct hsr_sup_tlv) to the pskb_may_pull() calls. Without this, a truncated frame could cause an out-of-bounds access.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: eafaa88b3eb7f28aecb222281655473431d3ef2e , < 09a37dca090c55ffb1a33f52d8667f1c2367ef48 (git)
Affected: eafaa88b3eb7f28aecb222281655473431d3ef2e , < a4b64f3e9c7b8259f7dd251a0313420ba7c01852 (git)
Affected: eafaa88b3eb7f28aecb222281655473431d3ef2e , < 71c986c0ba45b7dc574fae27c83e7b6671556f37 (git)
Affected: eafaa88b3eb7f28aecb222281655473431d3ef2e , < fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7 (git)
Affected: eafaa88b3eb7f28aecb222281655473431d3ef2e , < 78607a6854a22a2502f68092202e75a39af4865d (git)
Affected: eafaa88b3eb7f28aecb222281655473431d3ef2e , < f229426072fc865654a60978bb7fda790a051ff3 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "version": "6.18.35",
              "versionType": "semver"
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              "version": "7.0.12",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hsr: fix potential OOB access in supervision frame handling\n\nEnsure the entire TLV header is linearized before access by adding\nsizeof(struct hsr_sup_tlv) to the pskb_may_pull() calls. Without this,\na truncated frame could cause an out-of-bounds access."
        }
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "value": "AV:N - The vulnerable code is reached when the kernel processes received Ethernet frames via the netdev RX handler in net/hsr, and a remote attacker on the HSR/PRP ring can deliver a crafted supervision frame without any local access to the victim host.\nAC:L - The attacker fully controls the malformed frame content and length; a precisely truncated supervision frame reliably passes existing TLV validation and triggers the out-of-bounds read with no races or attacker-uncontrollable conditions.\nPR:N - Exploitation requires only the ability to inject L2 HSR/PRP supervision frames onto the ring segment; no local account, capabilities, or authentication on the target kernel is needed.\nUI:N - No victim user action is required beyond normal operation of an HSR/PRP-configured node; the attacker triggers the bug solely by sending a malicious frame.\nS:U - Impact is confined to kernel memory safety within the same security authority; there is no VM escape, IOMMU bypass, or cross-security-boundary scope change.\nC:H - The bug is an out-of-bounds read of supervision TLV header fields past the skb tail, which can disclose adjacent kernel heap/skb memory and is not strictly bounded to a few attacker-uncontrolled bytes.\nI:H - Out-of-bounds access in kernel packet parsing can supply attacker-influenced TLV type/length values that drive further skb_pull arithmetic and extended parsing, creating a plausible path to memory corruption and control-flow hijacking.\nA:H - Reading beyond the skb buffer boundary during softirq packet processing can cause a kernel oops/panic, and the attacker can repeatedly trigger the condition with crafted frames."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:01.596Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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          "url": "https://git.kernel.org/stable/c/f229426072fc865654a60978bb7fda790a051ff3"
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    "cveId": "CVE-2026-64000",
    "datePublished": "2026-07-19T14:56:18.116Z",
    "dateReserved": "2026-07-19T07:54:57.026Z",
    "dateUpdated": "2026-08-05T12:38:01.596Z",
    "state": "PUBLISHED"
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          }
        ],
        "id": "CVE-2026-64000",
        "lastModified": "2026-07-30T14:51:11.223",
        "metrics": {
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                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Awaiting Analysis"
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    },
    "redhat_vex": {
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      "current_release_date": "2026-07-21T16:31:22+00:00",
      "cve": "CVE-2026-64000",
      "id": "CVE-2026-64000",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: hsr: fix potential OOB access in supervision frame handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64000.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-18T00:45:04Z",
      "cve": "CVE-2026-64000",
      "id": "CVE-2026-64000",
      "initial_release_date": "2026-07-21T13:01:50Z",
      "product_status:first_fixed": "31",
      "product_status:known_affected": "482",
      "product_status:known_not_affected": "251",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64000",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64000.json",
      "version": "11"
    }
  }
}



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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.