Vulnerability-Lookup

GHSA-FXHV-RJVF-632G

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-19 18:32

Details

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

can: bcm: validate frame length in bcm_rx_setup() for RTR replies

bcm_tx_setup() validates cf->len against the CAN/CAN FD DLC limits before installing frames for TX_SETUP, but bcm_rx_setup() never did the same for the RTR-reply frame configured via RX_SETUP with RX_RTR_FRAME.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72114"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:25Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: validate frame length in bcm_rx_setup() for RTR replies\n\nbcm_tx_setup() validates cf-\u003elen against the CAN/CAN FD DLC limits\nbefore installing frames for TX_SETUP, but bcm_rx_setup() never did\nthe same for the RTR-reply frame configured via RX_SETUP with\nRX_RTR_FRAME.",
  "id": "GHSA-fxhv-rjvf-632g",
  "modified": "2026-08-19T18:32:27Z",
  "published": "2026-08-15T06:32:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72114"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b475c0c72f44622a320a4386ce9e76f85e69bc7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/204f2b232717bc470ddb9e1da1d27dd9c6ef0caa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/59bfddea64159594feb62ef11b7d7a33c8ee3783"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/62ec41f364648be79d54d94d0d240ee326948afd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d966cdee006911d3957e1a4e72cb93c39cd8c1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc1f9569f1c1adf74fa69d6f716a31b58a2fc6ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/deb6a697cce3f021e731df543597f37a5e54caab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e061624c0a86c3c26a2bf017e432fbc93ad68f3a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72114 (GCVE-0-2026-72114)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-19 16:36

Title

can: bcm: validate frame length in bcm_rx_setup() for RTR replies

Summary

In the Linux kernel, the following vulnerability has been resolved: can: bcm: validate frame length in bcm_rx_setup() for RTR replies bcm_tx_setup() validates cf->len against the CAN/CAN FD DLC limits before installing frames for TX_SETUP, but bcm_rx_setup() never did the same for the RTR-reply frame configured via RX_SETUP with RX_RTR_FRAME.

Severity

7.8 (High)


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

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/cc1f9569f1c1adf74…
https://git.kernel.org/stable/c/204f2b232717bc470…
https://git.kernel.org/stable/c/e061624c0a86c3c26…
https://git.kernel.org/stable/c/7d966cdee006911d3…
https://git.kernel.org/stable/c/1b475c0c72f44622a…
https://git.kernel.org/stable/c/deb6a697cce3f021e…
https://git.kernel.org/stable/c/59bfddea64159594f…
https://git.kernel.org/stable/c/62ec41f364648be79…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < cc1f9569f1c1adf74fa69d6f716a31b58a2fc6ce (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 204f2b232717bc470ddb9e1da1d27dd9c6ef0caa (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < e061624c0a86c3c26a2bf017e432fbc93ad68f3a (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 7d966cdee006911d3957e1a4e72cb93c39cd8c1e (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 1b475c0c72f44622a320a4386ce9e76f85e69bc7 (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < deb6a697cce3f021e731df543597f37a5e54caab (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 59bfddea64159594feb62ef11b7d7a33c8ee3783 (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 62ec41f364648be79d54d94d0d240ee326948afd (git)
Linux	Linux	Affected: 2.6.25 Unaffected: 0 , < 2.6.25 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/can/bcm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cc1f9569f1c1adf74fa69d6f716a31b58a2fc6ce",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
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              "versionType": "git"
            },
            {
              "lessThan": "e061624c0a86c3c26a2bf017e432fbc93ad68f3a",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
            },
            {
              "lessThan": "7d966cdee006911d3957e1a4e72cb93c39cd8c1e",
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              "versionType": "git"
            },
            {
              "lessThan": "1b475c0c72f44622a320a4386ce9e76f85e69bc7",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
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            {
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              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
            },
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          "vendor": "Linux",
          "versions": [
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              "version": "2.6.25"
            },
            {
              "lessThan": "2.6.25",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "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"
            },
            {
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              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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        {
          "nodes": [
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                  "versionStartIncluding": "2.6.25",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
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                  "vulnerable": true
                },
                {
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                {
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                {
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                  "versionStartIncluding": "2.6.25",
                  "vulnerable": true
                }
              ],
              "negate": false,
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: validate frame length in bcm_rx_setup() for RTR replies\n\nbcm_tx_setup() validates cf-\u003elen against the CAN/CAN FD DLC limits\nbefore installing frames for TX_SETUP, but bcm_rx_setup() never did\nthe same for the RTR-reply frame configured via RX_SETUP with\nRX_RTR_FRAME."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The missing validation is in bcm_rx_setup(), reached only via local PF_CAN SOCK_DGRAM CAN_BCM syscalls (socket/connect/sendmsg RX_SETUP with RX_RTR_FRAME); it is not triggered by remote IP services or by CAN bus traffic alone.\nAC:L - An attacker reliably installs a malformed RTR-reply frame with a single RX_SETUP sendmsg and can trigger bcm_can_tx() by sending or waiting for a matching RTR on the bound interface, with no races or layout dependencies beyond their control.\nPR:L - can_create(), bcm_connect(), and bcm_sendmsg() perform no capability checks; any local user with access to a CAN interface (including vcan created with CAP_NET_ADMIN in an unprivileged user namespace) can open BCM sockets and program RX_SETUP RTR replies.\nUI:N - Exploitation requires only the attacker opening a BCM socket and sending RX_SETUP messages; no victim interaction such as mounting filesystems or opening files is needed once local CAN access exists.\nS:U - Impact is kernel memory corruption and unauthorized CAN frame transmission within the same host security domain; it does not cross VM, container, or IOMMU boundaries even when frames reach an adjacent vehicle or industrial CAN segment.\nC:H - Unvalidated cf-\u003elen values are stored in op-\u003eframes and later passed to bcm_can_tx()/can_send(); many CAN driver ndo_start_xmit paths memcpy(cf-\u003edata, cf-\u003elen) trusting len, enabling out-of-bounds kernel reads when invalid lengths bypass or race skb validation.\nI:H - Attacker-controlled len in the RTR-reply frame can drive out-of-bounds memcpy writes in CAN USB/SPI/hardware xmit paths and inject attacker-crafted frame payloads onto safety-critical automotive, factory, or embedded CAN buses when RTR requests are answered.\nA:H - Out-of-bounds accesses in CAN driver transmit paths from trusted-but-invalid len values can cause kernel WARN/Oops/panic on hardened builds, and repeated malformed RTR-reply transmission attempts can wedge TX queues or disrupt CAN service on affected systems."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:36:00.857Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/cc1f9569f1c1adf74fa69d6f716a31b58a2fc6ce"
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          "url": "https://git.kernel.org/stable/c/204f2b232717bc470ddb9e1da1d27dd9c6ef0caa"
        },
        {
          "url": "https://git.kernel.org/stable/c/e061624c0a86c3c26a2bf017e432fbc93ad68f3a"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d966cdee006911d3957e1a4e72cb93c39cd8c1e"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/59bfddea64159594feb62ef11b7d7a33c8ee3783"
        },
        {
          "url": "https://git.kernel.org/stable/c/62ec41f364648be79d54d94d0d240ee326948afd"
        }
      ],
      "title": "can: bcm: validate frame length in bcm_rx_setup() for RTR replies",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72114",
    "datePublished": "2026-08-15T05:52:54.750Z",
    "dateReserved": "2026-08-09T03:40:39.906Z",
    "dateUpdated": "2026-08-19T16:36:00.857Z",
    "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.

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-FXHV-RJVF-632G

CVE-2026-72114 (GCVE-0-2026-72114)

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