CVE-2026-72117 (GCVE-0-2026-72117)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-19 16:36
VLAI
Title
can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()
Summary
In the Linux kernel, the following vulnerability has been resolved: can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler() For an rx op subscribed on all interfaces (ifindex == 0), the same op is registered once in the shared per-netns wildcard filter list, so bcm_rx_handler() can run concurrently on different CPUs for frames arriving on different net devices. op->rx_stamp and op->rx_ifindex were written before bcm_rx_update_lock was taken, allowing concurrent writers to race each other - including a torn store of the 64-bit rx_stamp on 32-bit platforms. Beyond a torn store bcm_send_to_user() must report the timestamp/ifindex of the very same frame whose content it is delivering. So the assignment is placed in the same unbroken bcm_rx_update_lock section as the content comparison. As a side effect, the RTR-request frame feature (which never reach bcm_send_to_user()) no longer updates rx_stamp/rx_ifindex, since only the notification path needs them.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < b64f60c468d149aca22ea56bb842b9730215aaa5 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 4b97410f4bba18d2ee2784c8e089104f387bc27c (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 656ff69ef235699035e57d9e1ae417e62a38aa7f (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 136de17f38630307991c59aa7080012a99451783 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < c312b750bb5ac3348cfc85dab25e90937bd4d251 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8 (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)
guessed Create a notification for this product.
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        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5"
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    "datePublished": "2026-08-15T05:52:56.991Z",
    "dateReserved": "2026-08-09T03:40:39.906Z",
    "dateUpdated": "2026-08-19T16:36:08.847Z",
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        "descriptions": [
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()\n\nFor an rx op subscribed on all interfaces (ifindex == 0), the same op\nis registered once in the shared per-netns wildcard filter list, so\nbcm_rx_handler() can run concurrently on different CPUs for frames\narriving on different net devices.\n\nop-\u003erx_stamp and op-\u003erx_ifindex were written before bcm_rx_update_lock was\ntaken, allowing concurrent writers to race each other - including a torn\nstore of the 64-bit rx_stamp on 32-bit platforms.\n\nBeyond a torn store bcm_send_to_user() must report the timestamp/ifindex\nof the very same frame whose content it is delivering. So the assignment\nis placed in the same unbroken bcm_rx_update_lock section as the content\ncomparison.\n\nAs a side effect, the RTR-request frame feature (which never reach\nbcm_send_to_user()) no longer updates rx_stamp/rx_ifindex, since only\nthe notification path needs them."
          }
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        "lastModified": "2026-08-19T17:20:58.287",
        "metrics": {},
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-19T05:26:16+00:00",
      "cve": "CVE-2026-72117",
      "id": "CVE-2026-72117",
      "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: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72117.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:29:29Z",
      "cve": "CVE-2026-72117",
      "id": "CVE-2026-72117",
      "initial_release_date": "2026-08-29T01:08:33Z",
      "product_status:known_affected": "362",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72117",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72117.json",
      "version": "4"
    }
  }
}



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