CVE-2026-64000 (GCVE-0-2026-64000)
Vulnerability from cvelistv5
Published
2026-07-19 14:56
Modified
2026-08-05 12:38
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: eafaa88b3eb7f28aecb222281655473431d3ef2e
Version: eafaa88b3eb7f28aecb222281655473431d3ef2e
Version: eafaa88b3eb7f28aecb222281655473431d3ef2e
Version: eafaa88b3eb7f28aecb222281655473431d3ef2e
Version: eafaa88b3eb7f28aecb222281655473431d3ef2e
Version: eafaa88b3eb7f28aecb222281655473431d3ef2e
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/hsr/hsr_forward.c"
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          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "5.16"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.6.143",
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                  "vulnerable": true
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/09a37dca090c55ffb1a33f52d8667f1c2367ef48"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4b64f3e9c7b8259f7dd251a0313420ba7c01852"
        },
        {
          "url": "https://git.kernel.org/stable/c/71c986c0ba45b7dc574fae27c83e7b6671556f37"
        },
        {
          "url": "https://git.kernel.org/stable/c/fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7"
        },
        {
          "url": "https://git.kernel.org/stable/c/78607a6854a22a2502f68092202e75a39af4865d"
        },
        {
          "url": "https://git.kernel.org/stable/c/f229426072fc865654a60978bb7fda790a051ff3"
        }
      ],
      "title": "net: hsr: fix potential OOB access in supervision frame handling",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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