CVE-2026-52971 (GCVE-0-2026-52971)
Vulnerability from cvelistv5
Published
2026-06-24 16:28
Modified
2026-10-19 19:47
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: ena: PHC: Fix potential use-after-free in get_timestamp Move the phc->active check and resp pointer assignment to after acquiring the spinlock. Previously, phc->active was checked without holding the lock, and resp was cached from ena_dev->phc.virt_addr before the lock was acquired. If ena_com_phc_destroy() runs between the lockless active check and the lock acquisition, it sets active=false, releases the lock, frees the DMA memory, and sets virt_addr=NULL. The get_timestamp path would then read a NULL virt_addr and dereference it. With both the active check and the pointer read under the lock, destroy cannot free the memory while get_timestamp is using it.
References
Impacted products
Vendor Product Version
Linux Linux Version: e0ea34158ee8c4f7536cd781010339ff28c0d24c
Version: e0ea34158ee8c4f7536cd781010339ff28c0d24c
Version: e0ea34158ee8c4f7536cd781010339ff28c0d24c
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-52971",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T15:23:43.033960Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-362",
                "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-19T19:47:11.012Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/amazon/ena/ena_com.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98",
              "status": "affected",
              "version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c",
              "versionType": "git"
            },
            {
              "lessThan": "ca9ed40f28949353911dcb524ff8fff2f3409c97",
              "status": "affected",
              "version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c",
              "versionType": "git"
            },
            {
              "lessThan": "e42c755582f0960e684298762f0ab927b3778376",
              "status": "affected",
              "version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/amazon/ena/ena_com.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ena: PHC: Fix potential use-after-free in get_timestamp\n\nMove the phc-\u003eactive check and resp pointer assignment to after\nacquiring the spinlock. Previously, phc-\u003eactive was checked without\nholding the lock, and resp was cached from ena_dev-\u003ephc.virt_addr\nbefore the lock was acquired.\n\nIf ena_com_phc_destroy() runs between the lockless active check and\nthe lock acquisition, it sets active=false, releases the lock, frees\nthe DMA memory, and sets virt_addr=NULL. The get_timestamp path would\nthen read a NULL virt_addr and dereference it.\n\nWith both the active check and the pointer read under the lock,\ndestroy cannot free the memory while get_timestamp is using it."
        }
      ],
      "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 vulnerable ENA PHC timestamp path is reached through local PTP clock access such as opening `/dev/ptpN` and invoking `clock_gettime()`/PTP ioctls, not by remote network packets.\nAC:L - The bug is a retryable race between timestamp retrieval and ENA PHC destroy during reset/reinit, and repeated local timestamp calls can exercise the vulnerable window without special memory layout assumptions.\nPR:L - The generic PTP gettime path has no capability check; the attacker only needs local access to the PTP character device/file descriptor, which is a low-privilege local access condition.\nUI:N - No victim action is required once the attacker can access the local PTP clock interface and race it with reset/destruction activity.\nS:U - The vulnerability affects kernel memory within the same host kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free of a coherent DMA response buffer whose contents are read back through timestamp retrieval, and under the required higher-severity rule UAF is treated as capable of high confidentiality impact.\nI:H - The stale response pointer is written through after free (`req_id` update) and may corrupt reused kernel/DMA memory, so under the UAF guidance this supports high integrity impact.\nA:H - The stale or NULL/freed pointer dereference can oops or panic the kernel during timestamp retrieval, causing high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:32:13.881Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97"
        },
        {
          "url": "https://git.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376"
        }
      ],
      "title": "net: ena: PHC: Fix potential use-after-free in get_timestamp",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52971",
    "datePublished": "2026-06-24T16:28:49.637Z",
    "dateReserved": "2026-06-09T07:44:35.375Z",
    "dateUpdated": "2026-10-19T19:47:11.012Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"cna\": {\"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:32:13.881Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: ena: PHC: Fix potential use-after-free in get_timestamp\\n\\nMove the phc-\u003eactive check and resp pointer assignment to after\\nacquiring the spinlock. Previously, phc-\u003eactive was checked without\\nholding the lock, and resp was cached from ena_dev-\u003ephc.virt_addr\\nbefore the lock was acquired.\\n\\nIf ena_com_phc_destroy() runs between the lockless active check and\\nthe lock acquisition, it sets active=false, releases the lock, frees\\nthe DMA memory, and sets virt_addr=NULL. The get_timestamp path would\\nthen read a NULL virt_addr and dereference it.\\n\\nWith both the active check and the pointer read under the lock,\\ndestroy cannot free the memory while get_timestamp is using it.\"}], \"metrics\": [{\"cvssV3_1\": {\"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\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerable ENA PHC timestamp path is reached through local PTP clock access such as opening `/dev/ptpN` and invoking `clock_gettime()`/PTP ioctls, not by remote network packets.\\nAC:L - The bug is a retryable race between timestamp retrieval and ENA PHC destroy during reset/reinit, and repeated local timestamp calls can exercise the vulnerable window without special memory layout assumptions.\\nPR:L - The generic PTP gettime path has no capability check; the attacker only needs local access to the PTP character device/file descriptor, which is a low-privilege local access condition.\\nUI:N - No victim action is required once the attacker can access the local PTP clock interface and race it with reset/destruction activity.\\nS:U - The vulnerability affects kernel memory within the same host kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\\nC:H - This is a use-after-free of a coherent DMA response buffer whose contents are read back through timestamp retrieval, and under the required higher-severity rule UAF is treated as capable of high confidentiality impact.\\nI:H - The stale response pointer is written through after free (`req_id` update) and may corrupt reused kernel/DMA memory, so under the UAF guidance this supports high integrity impact.\\nA:H - The stale or NULL/freed pointer dereference can oops or panic the kernel during timestamp retrieval, causing high availability impact.\"}]}], \"affected\": [{\"product\": \"Linux\", \"vendor\": \"Linux\", \"defaultStatus\": \"unaffected\", \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"programFiles\": [\"drivers/net/ethernet/amazon/ena/ena_com.c\"], \"versions\": [{\"version\": \"e0ea34158ee8c4f7536cd781010339ff28c0d24c\", \"lessThan\": \"95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"e0ea34158ee8c4f7536cd781010339ff28c0d24c\", \"lessThan\": \"ca9ed40f28949353911dcb524ff8fff2f3409c97\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"e0ea34158ee8c4f7536cd781010339ff28c0d24c\", \"lessThan\": \"e42c755582f0960e684298762f0ab927b3778376\", \"status\": \"affected\", \"versionType\": \"git\"}]}, {\"product\": \"Linux\", \"vendor\": \"Linux\", \"defaultStatus\": \"affected\", \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"programFiles\": [\"drivers/net/ethernet/amazon/ena/ena_com.c\"], \"versions\": [{\"version\": \"6.17\", \"status\": \"affected\"}, {\"version\": \"0\", \"lessThan\": \"6.17\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"6.18.33\", \"lessThanOrEqual\": \"6.18.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"7.0.10\", \"lessThanOrEqual\": \"7.0.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"7.1\", \"lessThanOrEqual\": \"*\", \"status\": \"unaffected\", \"versionType\": \"original_commit_for_fix\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.17\", \"versionEndExcluding\": \"6.18.33\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.17\", \"versionEndExcluding\": \"7.0.10\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.17\", \"versionEndExcluding\": \"7.1\"}]}]}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98\"}, {\"url\": \"https://git.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97\"}, {\"url\": \"https://git.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376\"}], \"title\": \"net: ena: PHC: Fix potential use-after-free in get_timestamp\", \"x_generator\": {\"engine\": \"bippy-1.2.0\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-52971\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:23:43.033960Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-362\", \"description\": \"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:23:43.610Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-52971\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2026-06-09T07:44:35.375Z\", \"datePublished\": \"2026-06-24T16:28:49.637Z\", \"dateUpdated\": \"2026-10-19T19:47:11.012Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.