CVE-2026-80991 (GCVE-0-2026-80991)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-21 12:47
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ravb: serialize PTP clock teardown ravb_ptp_interrupt() can race with ravb_ptp_stop() and pass the clock to ptp_clock_event() while ptp_clock_unregister() is freeing it. This can lead to a use-after-free. Use READ_ONCE() and WRITE_ONCE() for lockless access to the clock pointer. Atomically detach it with xchg() before disabling PTP interrupts, then synchronize all IRQs which can invoke ravb_ptp_interrupt() before unregistering the detached clock. A handler which read the old pointer completes before the clock is unregistered, while later handlers read NULL and skip the event.
References
Impacted products
Vendor Product Version
Linux Linux Version: a0d2f20650e81407d8e51ad2cbdc492861c74e9c
Version: a0d2f20650e81407d8e51ad2cbdc492861c74e9c
Version: a0d2f20650e81407d8e51ad2cbdc492861c74e9c
Version: a0d2f20650e81407d8e51ad2cbdc492861c74e9c
Version: a0d2f20650e81407d8e51ad2cbdc492861c74e9c
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/renesas/ravb.h",
            "drivers/net/ethernet/renesas/ravb_main.c",
            "drivers/net/ethernet/renesas/ravb_ptp.c"
          ],
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/renesas/ravb.h",
            "drivers/net/ethernet/renesas/ravb_main.c",
            "drivers/net/ethernet/renesas/ravb_ptp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "4.2"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.160",
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            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ravb: serialize PTP clock teardown\n\nravb_ptp_interrupt() can race with ravb_ptp_stop() and pass the clock to\nptp_clock_event() while ptp_clock_unregister() is freeing it. This can\nlead to a use-after-free.\n\nUse READ_ONCE() and WRITE_ONCE() for lockless access to the clock pointer.\nAtomically detach it with xchg() before disabling PTP interrupts, then\nsynchronize all IRQs which can invoke ravb_ptp_interrupt() before\nunregistering the detached clock.\n\nA handler which read the old pointer completes before the clock is\nunregistered, while later handlers read NULL and skip the event."
        }
      ],
      "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 UAF is reached from the ravb gPTP IRQ handler (ravb_interrupt/ravb_multi_interrupt \u2192 ravb_ptp_interrupt \u2192 ptp_clock_event) racing local ravb_ptp_stop teardown (close, suspend, TX-timeout work, ethtool ringparam). GIS_PTCF capture IRQs come from the on-chip AVB timer, not from parsing received Ethernet frames.\nAC:L - The attacker drives both sides: ordinary sockets or automotive idle autosuspend trigger ravb_ptp_stop, and PTP_EXTTS_REQUEST on /dev/ptpX (write fd, no CAP_SYS_TIME) enables capture IRQs. Pre-fix stop cleared GIC then called ptp_clock_unregister without synchronize_irq, so an in-flight handler can be raced repeatedly.\nPR:L - On Renesas R-Car/RZ automotive and industrial systems, unprivileged traffic arms ravb_tx_timeout_work and platform autosleep calls ravb_close without CAP_NET_ADMIN; EXTTS enable needs only a writable PTP chardev, not host root. This matches CVE-2025-21801 and CVE-2023-52509 ravb scoring.\nUI:N - Interface teardown runs from the TX watchdog or from automatic suspend/idle power management on the affected platforms, with no separate victim user action required.\nS:U - The use-after-free corrupts the host kernel\u0027s struct ptp_clock heap object within a single kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - ptp_clock_event takes ptp-\u003etsevqs_lock and walks the timestamp queue list after ptp_clock_release has kfree\u0027d the clock, so reclaiming that slab provides an arbitrary kernel-memory read primitive.\nI:H - The same IRQ-context UAF writes via enqueue_external_timestamp into list-queue objects the attacker can reclaim, yielding a kernel heap write primitive suitable for control-flow hijacking.\nA:H - Use-after-free of struct ptp_clock in hardirq context causes a kernel oops or panic and takes down the system\u0027s primary Ethernet interface."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:47:22.150Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b917f37bfcce919a969d66a044580a95b11df31c"
        },
        {
          "url": "https://git.kernel.org/stable/c/695acb5534a9e366efb47b40c7487fc56488b09b"
        },
        {
          "url": "https://git.kernel.org/stable/c/67a82e6f886beed0de8f8da08bb767e68fba952d"
        },
        {
          "url": "https://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25"
        },
        {
          "url": "https://git.kernel.org/stable/c/1cb9663789c5b7a12fcd419fcca6d6254c398252"
        }
      ],
      "title": "net: ravb: serialize PTP clock teardown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80991",
    "datePublished": "2026-09-11T19:42:48.187Z",
    "dateReserved": "2026-08-26T14:34:25.811Z",
    "dateUpdated": "2026-10-21T12:47:22.150Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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