CVE-2026-53300 (GCVE-0-2026-53300)

Vulnerability from cvelistv5 – Published: 2026-06-26 19:40 – Updated: 2026-06-28 06:41
VLAI
Title
net: enetc: fix NTMP DMA use-after-free issue
Summary
In the Linux kernel, the following vulnerability has been resolved: net: enetc: fix NTMP DMA use-after-free issue The AI-generated review reported a potential DMA use-after-free issue [1]. If netc_xmit_ntmp_cmd() times out and returns an error, the pending command is not explicitly aborted, while ntmp_free_data_mem() unconditionally frees the DMA buffer. If the buffer has already been reallocated elsewhere, this may lead to silent memory corruption. Because the hardware eventually processes the pending command and perform a DMA write of the response to the physical address of the freed buffer. To resolve this issue, this patch does the following modifications: 1. Convert cbdr->ring_lock from a spinlock to a mutex The lock was originally a spinlock in case NTMP operations might be invoked from atomic context. After downstream support for all NTMP tables, no such usage has materialized. A mutex lock is now required because the driver now needs to reclaim used BDs and release associated DMA memory within the lock's context, while dma_free_coherent() might sleep. 2. Introduce software command BD (struct netc_swcbd) The hardware write-back overwrites the addr and len fields of the BD, so the driver cannot rely on the hardware BD to free the associated DMA memory. The driver now maintains a software shadow BD storing the DMA buffer pointer, DMA address, and size. And netc_xmit_ntmp_cmd() only reclaims older BDs when the number of used BDs reaches NETC_CBDR_CLEAN_WORK (16). The software BD enables correct DMA memory release. With this, struct ntmp_dma_buf and ntmp_free_data_mem() are no longer needed and are removed. 3. Require callers to hold ring_lock across netc_xmit_ntmp_cmd() netc_xmit_ntmp_cmd() releases the ring_lock before the caller finishes consuming the response. At this point, if a concurrent thread submits a new command, it may trigger ntmp_clean_cbdr() and free the DMA buffer while it is still in use. Move ring_lock ownership to the caller to ensure the response buffer cannot be reclaimed prematurely. So the helpers ntmp_select_and_lock_cbdr() and ntmp_unlock_cbdr() are added. These changes eliminate the DMA use-after-free condition and ensure safe and consistent BD reclamation and DMA buffer lifecycle management.
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
Linux Linux Affected: 4701073c3debd16d7f534f3eb808bd9b50601c0c , < 37c8933064be714ee672b0a0523c2fd045b73b3d (git)
Affected: 4701073c3debd16d7f534f3eb808bd9b50601c0c , < 655d9ce9b1d3db0aa5271acb5e5101c66bd0d58b (git)
Affected: 4701073c3debd16d7f534f3eb808bd9b50601c0c , < 3cade698881eb238f88cbbfec82acc2110440a3f (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/freescale/enetc/ntmp.c",
            "drivers/net/ethernet/freescale/enetc/ntmp_private.h",
            "include/linux/fsl/ntmp.h"
          ],
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          "vendor": "Linux",
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            "drivers/net/ethernet/freescale/enetc/ntmp_private.h",
            "include/linux/fsl/ntmp.h"
          ],
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          "vendor": "Linux",
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              "versionType": "semver"
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              "operator": "OR"
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      "descriptions": [
        {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: enetc: fix NTMP DMA use-after-free issue\n\nThe AI-generated review reported a potential DMA use-after-free issue\n[1]. If netc_xmit_ntmp_cmd() times out and returns an error, the pending\ncommand is not explicitly aborted, while ntmp_free_data_mem()\nunconditionally frees the DMA buffer. If the buffer has already been\nreallocated elsewhere, this may lead to silent memory corruption. Because\nthe hardware eventually processes the pending command and perform a DMA\nwrite of the response to the physical address of the freed buffer.\n\nTo resolve this issue, this patch does the following modifications:\n\n1. Convert cbdr-\u003ering_lock from a spinlock to a mutex\n\nThe lock was originally a spinlock in case NTMP operations might be\ninvoked from atomic context. After downstream support for all NTMP\ntables, no such usage has materialized. A mutex lock is now required\nbecause the driver now needs to reclaim used BDs and release associated\nDMA memory within the lock\u0027s context, while dma_free_coherent() might\nsleep.\n\n2. Introduce software command BD (struct netc_swcbd)\n\nThe hardware write-back overwrites the addr and len fields of the BD,\nso the driver cannot rely on the hardware BD to free the associated DMA\nmemory. The driver now maintains a software shadow BD storing the DMA\nbuffer pointer, DMA address, and size. And netc_xmit_ntmp_cmd() only\nreclaims older BDs when the number of used BDs reaches\nNETC_CBDR_CLEAN_WORK (16). The software BD enables correct DMA memory\nrelease. With this, struct ntmp_dma_buf and ntmp_free_data_mem() are no\nlonger needed and are removed.\n\n3. Require callers to hold ring_lock across netc_xmit_ntmp_cmd()\n\nnetc_xmit_ntmp_cmd() releases the ring_lock before the caller finishes\nconsuming the response. At this point, if a concurrent thread submits\na new command, it may trigger ntmp_clean_cbdr() and free the DMA buffer\nwhile it is still in use. Move ring_lock ownership to the caller to\nensure the response buffer cannot be reclaimed prematurely. So the\nhelpers ntmp_select_and_lock_cbdr() and ntmp_unlock_cbdr() are added.\n\nThese changes eliminate the DMA use-after-free condition and ensure safe\nand consistent BD reclamation and DMA buffer lifecycle management."
        }
      ],
      "metrics": [
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            "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"
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      "providerMetadata": {
        "dateUpdated": "2026-06-28T06:41:28.036Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/37c8933064be714ee672b0a0523c2fd045b73b3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/655d9ce9b1d3db0aa5271acb5e5101c66bd0d58b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3cade698881eb238f88cbbfec82acc2110440a3f"
        }
      ],
      "title": "net: enetc: fix NTMP DMA use-after-free issue",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53300",
    "datePublished": "2026-06-26T19:40:57.186Z",
    "dateReserved": "2026-06-09T07:44:35.397Z",
    "dateUpdated": "2026-06-28T06:41:28.036Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-06-28",
      "epss": "0.00124",
      "percentile": "0.02471"
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Convert cbdr-\u003ering_lock from a spinlock to a mutex\\n\\nThe lock was originally a spinlock in case NTMP operations might be\\ninvoked from atomic context. After downstream support for all NTMP\\ntables, no such usage has materialized. A mutex lock is now required\\nbecause the driver now needs to reclaim used BDs and release associated\\nDMA memory within the lock\u0027s context, while dma_free_coherent() might\\nsleep.\\n\\n2. Introduce software command BD (struct netc_swcbd)\\n\\nThe hardware write-back overwrites the addr and len fields of the BD,\\nso the driver cannot rely on the hardware BD to free the associated DMA\\nmemory. The driver now maintains a software shadow BD storing the DMA\\nbuffer pointer, DMA address, and size. And netc_xmit_ntmp_cmd() only\\nreclaims older BDs when the number of used BDs reaches\\nNETC_CBDR_CLEAN_WORK (16). The software BD enables correct DMA memory\\nrelease. With this, struct ntmp_dma_buf and ntmp_free_data_mem() are no\\nlonger needed and are removed.\\n\\n3. Require callers to hold ring_lock across netc_xmit_ntmp_cmd()\\n\\nnetc_xmit_ntmp_cmd() releases the ring_lock before the caller finishes\\nconsuming the response. At this point, if a concurrent thread submits\\na new command, it may trigger ntmp_clean_cbdr() and free the DMA buffer\\nwhile it is still in use. Move ring_lock ownership to the caller to\\nensure the response buffer cannot be reclaimed prematurely. So the\\nhelpers ntmp_select_and_lock_cbdr() and ntmp_unlock_cbdr() are added.\\n\\nThese changes eliminate the DMA use-after-free condition and ensure safe\\nand consistent BD reclamation and DMA buffer lifecycle management.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/freescale/enetc/ntmp.c\",\"drivers/net/ethernet/freescale/enetc/ntmp_private.h\",\"include/linux/fsl/ntmp.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4701073c3debd16d7f534f3eb808bd9b50601c0c\",\"lessThan\":\"37c8933064be714ee672b0a0523c2fd045b73b3d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4701073c3debd16d7f534f3eb808bd9b50601c0c\",\"lessThan\":\"655d9ce9b1d3db0aa5271acb5e5101c66bd0d58b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4701073c3debd16d7f534f3eb808bd9b50601c0c\",\"lessThan\":\"3cade698881eb238f88cbbfec82acc2110440a3f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/freescale/enetc/ntmp.c\",\"drivers/net/ethernet/freescale/enetc/ntmp_private.h\",\"include/linux/fsl/ntmp.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"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/37c8933064be714ee672b0a0523c2fd045b73b3d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3cade698881eb238f88cbbfec82acc2110440a3f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/655d9ce9b1d3db0aa5271acb5e5101c66bd0d58b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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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.

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  • 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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