Vulnerability-Lookup

GHSA-7QJR-5MR5-8M2Q

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-28 09:31

Details

In the Linux kernel, the following vulnerability has been resolved:

can: j1939: transport: j1939_session_fresh_new(): initialize receive buffer

Zero the allocated buffer in j1939_session_fresh_new() to ensure it contains no residual data.

While there is a potential performance impact if users allocate maximum sized ETP buffers, most real-world use cases are not noticeably affected since the maximum known buffer size is typically around 65K.

[mkl: add Message-ID]

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80707"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: transport: j1939_session_fresh_new(): initialize receive buffer\n\nZero the allocated buffer in j1939_session_fresh_new() to ensure it\ncontains no residual data.\n\nWhile there is a potential performance impact if users allocate maximum\nsized ETP buffers, most real-world use cases are not noticeably affected\nsince the maximum known buffer size is typically around 65K.\n\n[mkl: add Message-ID]",
  "id": "GHSA-7qjr-5mr5-8m2q",
  "modified": "2026-08-28T09:31:50Z",
  "published": "2026-08-28T09:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80707"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/038bad8e16c2e28acf31f0b527a816fb23a57269"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/194d67e92197eb820f4c2c6605d9721333b3eba0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/348818277a3646d5b9fa60c9d20c00dc4bc86832"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8604a3b81b9d0ceaf04fee5f52e701f623a179f9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbfa49d1e287de44994955b44d19281be3195b44"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5b3613c7d69d8dcb4dd6704f1f463198ce9f6cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb96c58907922546e415e545fe9a14ea63b02719"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f3e120a34b336079479fa10f706f0636eaa6e751"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-80707 (GCVE-0-2026-80707)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:53 – Updated: 2026-08-29 06:22

Title

can: j1939: transport: j1939_session_fresh_new(): initialize receive buffer

Summary

In the Linux kernel, the following vulnerability has been resolved: can: j1939: transport: j1939_session_fresh_new(): initialize receive buffer Zero the allocated buffer in j1939_session_fresh_new() to ensure it contains no residual data. While there is a potential performance impact if users allocate maximum sized ETP buffers, most real-world use cases are not noticeably affected since the maximum known buffer size is typically around 65K. [mkl: add Message-ID]

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/348818277a3646d5b…
https://git.kernel.org/stable/c/f3e120a34b3360794…
https://git.kernel.org/stable/c/bbfa49d1e287de449…
https://git.kernel.org/stable/c/194d67e92197eb820…
https://git.kernel.org/stable/c/038bad8e16c2e28ac…
https://git.kernel.org/stable/c/8604a3b81b9d0ceaf…
https://git.kernel.org/stable/c/d5b3613c7d69d8dcb…
https://git.kernel.org/stable/c/eb96c58907922546e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 348818277a3646d5b9fa60c9d20c00dc4bc86832 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < f3e120a34b336079479fa10f706f0636eaa6e751 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < bbfa49d1e287de44994955b44d19281be3195b44 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 194d67e92197eb820f4c2c6605d9721333b3eba0 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 038bad8e16c2e28acf31f0b527a816fb23a57269 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 8604a3b81b9d0ceaf04fee5f52e701f623a179f9 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < d5b3613c7d69d8dcb4dd6704f1f463198ce9f6cf (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < eb96c58907922546e415e545fe9a14ea63b02719 (git)
Linux	Linux	Affected: 5.4 Unaffected: 0 , < 5.4 (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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/can/j1939/transport.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "348818277a3646d5b9fa60c9d20c00dc4bc86832",
              "status": "affected",
              "version": "9d71dd0c70099914fcd063135da3c580865e924c",
              "versionType": "git"
            },
            {
              "lessThan": "f3e120a34b336079479fa10f706f0636eaa6e751",
              "status": "affected",
              "version": "9d71dd0c70099914fcd063135da3c580865e924c",
              "versionType": "git"
            },
            {
              "lessThan": "bbfa49d1e287de44994955b44d19281be3195b44",
              "status": "affected",
              "version": "9d71dd0c70099914fcd063135da3c580865e924c",
              "versionType": "git"
            },
            {
              "lessThan": "194d67e92197eb820f4c2c6605d9721333b3eba0",
              "status": "affected",
              "version": "9d71dd0c70099914fcd063135da3c580865e924c",
              "versionType": "git"
            },
            {
              "lessThan": "038bad8e16c2e28acf31f0b527a816fb23a57269",
              "status": "affected",
              "version": "9d71dd0c70099914fcd063135da3c580865e924c",
              "versionType": "git"
            },
            {
              "lessThan": "8604a3b81b9d0ceaf04fee5f52e701f623a179f9",
              "status": "affected",
              "version": "9d71dd0c70099914fcd063135da3c580865e924c",
              "versionType": "git"
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            {
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              "status": "affected",
              "version": "9d71dd0c70099914fcd063135da3c580865e924c",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.4"
            },
            {
              "lessThan": "5.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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            {
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                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "5.4",
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                {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: transport: j1939_session_fresh_new(): initialize receive buffer\n\nZero the allocated buffer in j1939_session_fresh_new() to ensure it\ncontains no residual data.\n\nWhile there is a potential performance impact if users allocate maximum\nsized ETP buffers, most real-world use cases are not noticeably affected\nsince the maximum known buffer size is typically around 65K.\n\n[mkl: add Message-ID]"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Received J1939 TP/ETP RTS frames enter j1939_can_recv()\u2192j1939_tp_recv()\u2192j1939_xtp_rx_rts_session_new()\u2192j1939_session_fresh_new() from the CAN receive path with no local syscall; telematics/CAN gateways routinely expose J1939 to remote peers, consistent with prior kernel CNA scores for the same subsystem (e.g. CVE-2023-52887, CVE-2026-22997).\nAC:L - The attacker controls RTS-declared message size, DATA/EOMA sequencing, and timing; skb_put() leaves the entire allocation uninitialized, j1939_xtp_rx_eoma_one() completes without verifying all data packets arrived, and recvmsg returns the full skb length\u2014reliably mixing attacker data with residual heap bytes (including trailing padding).\nPR:N - J1939 receive processing has no authentication gate; an unauthenticated CAN/J1939 peer can send crafted transport-control frames to a victim ECU that already runs a bound J1939 socket (normal automotive, trucking, and industrial deployments) without any Linux account or capability on the target.\nUI:N - No victim interaction is required beyond the target already operating the J1939 stack with a bound socket; the attacker only transmits crafted frames on the bus to trigger session allocation and completion.\nS:U - Uninitialized kernel heap contents are disclosed to matching local J1939 socket owners via recvmsg; impact remains within the same kernel security authority and does not cross VM, IOMMU, or sandbox boundaries.\nC:H - j1939_session_fresh_new() allocates the receive buffer with skb_put() instead of skb_put_zero(), so unfilled bytes retain prior slab contents; on completion j1939_session_completed() delivers the full total_message_size buffer (up to tp_max_packet_size, commonly ~65K) to userspace, disclosing kernel pointers and heap data.\nI:N - The bug only omits zero-initialization of the receive skb; there is no out-of-bounds write, use-after-free, or other memory-corruption primitive enabling integrity impact.\nA:N - Sessions complete or abort normally without kernel panic, oops, hang, or resource exhaustion; the vulnerability is an information-disclosure defect with no availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:24.493Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/eb96c58907922546e415e545fe9a14ea63b02719"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80707",
    "datePublished": "2026-08-28T06:53:08.244Z",
    "dateReserved": "2026-08-26T14:34:25.787Z",
    "dateUpdated": "2026-08-29T06:22:24.493Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-7QJR-5MR5-8M2Q

CVE-2026-80707 (GCVE-0-2026-80707)

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Sightings

Nomenclature