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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-19 16:36
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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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          "programFiles": [
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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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."
            }
          ]
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        "dateUpdated": "2026-08-19T16:36:00.857Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/204f2b232717bc470ddb9e1da1d27dd9c6ef0caa"
        },
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          "url": "https://git.kernel.org/stable/c/e061624c0a86c3c26a2bf017e432fbc93ad68f3a"
        },
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          "url": "https://git.kernel.org/stable/c/7d966cdee006911d3957e1a4e72cb93c39cd8c1e"
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        {
          "url": "https://git.kernel.org/stable/c/62ec41f364648be79d54d94d0d240ee326948afd"
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      "title": "can: bcm: validate frame length in bcm_rx_setup() for RTR replies",
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    "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",
  "vulnerability-lookup:meta": {
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      "date": "2026-08-24",
      "epss": "0.00164",
      "percentile": "0.05783"
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with\\nRX_RTR_FRAME.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/can/bcm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"cc1f9569f1c1adf74fa69d6f716a31b58a2fc6ce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"204f2b232717bc470ddb9e1da1d27dd9c6ef0caa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"e061624c0a86c3c26a2bf017e432fbc93ad68f3a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"7d966cdee006911d3957e1a4e72cb93c39cd8c1e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"1b475c0c72f44622a320a4386ce9e76f85e69bc7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"deb6a697cce3f021e731df543597f37a5e54caab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"59bfddea64159594feb62ef11b7d7a33c8ee3783\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"62ec41f364648be79d54d94d0d240ee326948afd\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/can/bcm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.25\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.25\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1b475c0c72f44622a320a4386ce9e76f85e69bc7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/204f2b232717bc470ddb9e1da1d27dd9c6ef0caa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/59bfddea64159594feb62ef11b7d7a33c8ee3783\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/62ec41f364648be79d54d94d0d240ee326948afd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7d966cdee006911d3957e1a4e72cb93c39cd8c1e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc1f9569f1c1adf74fa69d6f716a31b58a2fc6ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/deb6a697cce3f021e731df543597f37a5e54caab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e061624c0a86c3c26a2bf017e432fbc93ad68f3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T22:45:12+00:00",
      "cve": "CVE-2026-72114",
      "id": "CVE-2026-72114",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: bcm: validate frame length in bcm_rx_setup() for RTR replies",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72114.json",
      "version": "3"
    }
  }
}



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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

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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.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.