CVE-2025-38037 (GCVE-0-2025-38037)
Vulnerability from cvelistv5
Published
2025-06-18 09:33
Modified
2025-07-15 15:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: vxlan: Annotate FDB data races The 'used' and 'updated' fields in the FDB entry structure can be accessed concurrently by multiple threads, leading to reports such as [1]. Can be reproduced using [2]. Suppress these reports by annotating these accesses using READ_ONCE() / WRITE_ONCE(). [1] BUG: KCSAN: data-race in vxlan_xmit / vxlan_xmit write to 0xffff942604d263a8 of 8 bytes by task 286 on cpu 0: vxlan_xmit+0xb29/0x2380 dev_hard_start_xmit+0x84/0x2f0 __dev_queue_xmit+0x45a/0x1650 packet_xmit+0x100/0x150 packet_sendmsg+0x2114/0x2ac0 __sys_sendto+0x318/0x330 __x64_sys_sendto+0x76/0x90 x64_sys_call+0x14e8/0x1c00 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff942604d263a8 of 8 bytes by task 287 on cpu 2: vxlan_xmit+0xadf/0x2380 dev_hard_start_xmit+0x84/0x2f0 __dev_queue_xmit+0x45a/0x1650 packet_xmit+0x100/0x150 packet_sendmsg+0x2114/0x2ac0 __sys_sendto+0x318/0x330 __x64_sys_sendto+0x76/0x90 x64_sys_call+0x14e8/0x1c00 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000fffbac6e -> 0x00000000fffbac6f Reported by Kernel Concurrency Sanitizer on: CPU: 2 UID: 0 PID: 287 Comm: mausezahn Not tainted 6.13.0-rc7-01544-gb4b270f11a02 #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014 [2] #!/bin/bash set +H echo whitelist > /sys/kernel/debug/kcsan echo !vxlan_xmit > /sys/kernel/debug/kcsan ip link add name vx0 up type vxlan id 10010 dstport 4789 local 192.0.2.1 bridge fdb add 00:11:22:33:44:55 dev vx0 self static dst 198.51.100.1 taskset -c 0 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q & taskset -c 2 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q &
References
Impacted products
Vendor Product Version
Linux Linux Version: d342894c5d2f8c7df194c793ec4059656e09ca31
Version: d342894c5d2f8c7df194c793ec4059656e09ca31
Version: d342894c5d2f8c7df194c793ec4059656e09ca31
Version: d342894c5d2f8c7df194c793ec4059656e09ca31
Version: d342894c5d2f8c7df194c793ec4059656e09ca31
Version: d342894c5d2f8c7df194c793ec4059656e09ca31
Version: d342894c5d2f8c7df194c793ec4059656e09ca31
Version: d342894c5d2f8c7df194c793ec4059656e09ca31
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/vxlan/vxlan_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "02a33b1035a307453a1da6ce0a1bf3676be287d7",
              "status": "affected",
              "version": "d342894c5d2f8c7df194c793ec4059656e09ca31",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "e033da39fc6abbddab6c29624acef80757f273fa",
              "status": "affected",
              "version": "d342894c5d2f8c7df194c793ec4059656e09ca31",
              "versionType": "git"
            },
            {
              "lessThan": "784b78295a3a58bf052339dd669e6e03710220d3",
              "status": "affected",
              "version": "d342894c5d2f8c7df194c793ec4059656e09ca31",
              "versionType": "git"
            },
            {
              "lessThan": "13cba3f837903f7184d6e9b6137d5165ffe82a8f",
              "status": "affected",
              "version": "d342894c5d2f8c7df194c793ec4059656e09ca31",
              "versionType": "git"
            },
            {
              "lessThan": "a6644aeb8ddf196dec5f8e782293c36f065df4d7",
              "status": "affected",
              "version": "d342894c5d2f8c7df194c793ec4059656e09ca31",
              "versionType": "git"
            },
            {
              "lessThan": "4eceb7eae6ea7c950384c34e6dbbe872c981935f",
              "status": "affected",
              "version": "d342894c5d2f8c7df194c793ec4059656e09ca31",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "d342894c5d2f8c7df194c793ec4059656e09ca31",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/vxlan/vxlan_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.7"
            },
            {
              "lessThan": "3.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.294",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.238",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.185",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.31",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.294",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.238",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.185",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.141",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.93",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.31",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.9",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: Annotate FDB data races\n\nThe \u0027used\u0027 and \u0027updated\u0027 fields in the FDB entry structure can be\naccessed concurrently by multiple threads, leading to reports such as\n[1]. Can be reproduced using [2].\n\nSuppress these reports by annotating these accesses using\nREAD_ONCE() / WRITE_ONCE().\n\n[1]\nBUG: KCSAN: data-race in vxlan_xmit / vxlan_xmit\n\nwrite to 0xffff942604d263a8 of 8 bytes by task 286 on cpu 0:\n vxlan_xmit+0xb29/0x2380\n dev_hard_start_xmit+0x84/0x2f0\n __dev_queue_xmit+0x45a/0x1650\n packet_xmit+0x100/0x150\n packet_sendmsg+0x2114/0x2ac0\n __sys_sendto+0x318/0x330\n __x64_sys_sendto+0x76/0x90\n x64_sys_call+0x14e8/0x1c00\n do_syscall_64+0x9e/0x1a0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nread to 0xffff942604d263a8 of 8 bytes by task 287 on cpu 2:\n vxlan_xmit+0xadf/0x2380\n dev_hard_start_xmit+0x84/0x2f0\n __dev_queue_xmit+0x45a/0x1650\n packet_xmit+0x100/0x150\n packet_sendmsg+0x2114/0x2ac0\n __sys_sendto+0x318/0x330\n __x64_sys_sendto+0x76/0x90\n x64_sys_call+0x14e8/0x1c00\n do_syscall_64+0x9e/0x1a0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nvalue changed: 0x00000000fffbac6e -\u003e 0x00000000fffbac6f\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 2 UID: 0 PID: 287 Comm: mausezahn Not tainted 6.13.0-rc7-01544-gb4b270f11a02 #5\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014\n\n[2]\n #!/bin/bash\n\n set +H\n echo whitelist \u003e /sys/kernel/debug/kcsan\n echo !vxlan_xmit \u003e /sys/kernel/debug/kcsan\n\n ip link add name vx0 up type vxlan id 10010 dstport 4789 local 192.0.2.1\n bridge fdb add 00:11:22:33:44:55 dev vx0 self static dst 198.51.100.1\n taskset -c 0 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q \u0026\n taskset -c 2 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q \u0026"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-15T15:43:54.094Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/02a33b1035a307453a1da6ce0a1bf3676be287d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/87d076987a9ba106c83412fcd113656f71af05a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/e033da39fc6abbddab6c29624acef80757f273fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/784b78295a3a58bf052339dd669e6e03710220d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/13cba3f837903f7184d6e9b6137d5165ffe82a8f"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6644aeb8ddf196dec5f8e782293c36f065df4d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/4eceb7eae6ea7c950384c34e6dbbe872c981935f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f6205f8215f12a96518ac9469ff76294ae7bd612"
        }
      ],
      "title": "vxlan: Annotate FDB data races",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38037",
    "datePublished": "2025-06-18T09:33:23.551Z",
    "dateReserved": "2025-04-16T04:51:23.978Z",
    "dateUpdated": "2025-07-15T15:43:54.094Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38037\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T10:15:36.030\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvxlan: Annotate FDB data races\\n\\nThe \u0027used\u0027 and \u0027updated\u0027 fields in the FDB entry structure can be\\naccessed concurrently by multiple threads, leading to reports such as\\n[1]. Can be reproduced using [2].\\n\\nSuppress these reports by annotating these accesses using\\nREAD_ONCE() / WRITE_ONCE().\\n\\n[1]\\nBUG: KCSAN: data-race in vxlan_xmit / vxlan_xmit\\n\\nwrite to 0xffff942604d263a8 of 8 bytes by task 286 on cpu 0:\\n vxlan_xmit+0xb29/0x2380\\n dev_hard_start_xmit+0x84/0x2f0\\n __dev_queue_xmit+0x45a/0x1650\\n packet_xmit+0x100/0x150\\n packet_sendmsg+0x2114/0x2ac0\\n __sys_sendto+0x318/0x330\\n __x64_sys_sendto+0x76/0x90\\n x64_sys_call+0x14e8/0x1c00\\n do_syscall_64+0x9e/0x1a0\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\nread to 0xffff942604d263a8 of 8 bytes by task 287 on cpu 2:\\n vxlan_xmit+0xadf/0x2380\\n dev_hard_start_xmit+0x84/0x2f0\\n __dev_queue_xmit+0x45a/0x1650\\n packet_xmit+0x100/0x150\\n packet_sendmsg+0x2114/0x2ac0\\n __sys_sendto+0x318/0x330\\n __x64_sys_sendto+0x76/0x90\\n x64_sys_call+0x14e8/0x1c00\\n do_syscall_64+0x9e/0x1a0\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\nvalue changed: 0x00000000fffbac6e -\u003e 0x00000000fffbac6f\\n\\nReported by Kernel Concurrency Sanitizer on:\\nCPU: 2 UID: 0 PID: 287 Comm: mausezahn Not tainted 6.13.0-rc7-01544-gb4b270f11a02 #5\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014\\n\\n[2]\\n #!/bin/bash\\n\\n set +H\\n echo whitelist \u003e /sys/kernel/debug/kcsan\\n echo !vxlan_xmit \u003e /sys/kernel/debug/kcsan\\n\\n ip link add name vx0 up type vxlan id 10010 dstport 4789 local 192.0.2.1\\n bridge fdb add 00:11:22:33:44:55 dev vx0 self static dst 198.51.100.1\\n taskset -c 0 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q \u0026\\n taskset -c 2 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q \u0026\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: vxlan: Anotaci\u00f3n de ejecuciones de datos FDB. M\u00faltiples subprocesos pueden acceder simult\u00e1neamente a los campos \\\"usado\\\" y \\\"actualizado\\\" de la estructura de entrada FDB, lo que genera informes como [1]. Se puede reproducir con [2]. Para suprimir estos informes, anote estos accesos con READ_ONCE() / WRITE_ONCE(). [1] ERROR: KCSAN: ejecuci\u00f3n de datos en vxlan_xmit / vxlan_xmit escribe en 0xffff942604d263a8 de 8 bytes por la tarea 286 en la CPU 0: vxlan_xmit+0xb29/0x2380 dev_hard_start_xmit+0x84/0x2f0 __dev_queue_xmit+0x45a/0x1650 packet_xmit+0x100/0x150 packet_sendmsg+0x2114/0x2ac0 __sys_sendto+0x318/0x330 __x64_sys_sendto+0x76/0x90 x64_sys_call+0x14e8/0x1c00 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f lectura a 0xffff942604d263a8 de 8 bytes por la tarea 287 en la CPU 2: vxlan_xmit+0xadf/0x2380 dev_hard_start_xmit+0x84/0x2f0 __dev_queue_xmit+0x45a/0x1650 packet_xmit+0x100/0x150 packet_sendmsg+0x2114/0x2ac0 __sys_sendto+0x318/0x330 __x64_sys_sendto+0x76/0x90 x64_sys_call+0x14e8/0x1c00 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f valor cambiado: 0x00000000fffbac6e -\u0026gt; 0x00000000fffbac6f Informado por Kernel Concurrency Sanitizer en: CPU: 2 UID: 0 PID: 287 Comm: mausezahn No contaminado 6.13.0-rc7-01544-gb4b270f11a02 #5 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 01/04/2014 [2] #!/bin/bash set +H echo whitelist \u0026gt; /sys/kernel/debug/kcsan echo !vxlan_xmit \u0026gt; /sys/kernel/debug/kcsan ip enlace agregar nombre vx0 activo tipo vxlan id 10010 dstport 4789 local 192.0.2.1 puente fdb agregar 00:11:22:33:44:55 dev vx0 self static dst 198.51.100.1 conjunto de tareas -c 0 mausezahn vx0 -a propio -b 00:11:22:33:44:55 -c 0 -q \u0026amp; conjunto de tareas -c 2 mausezahn vx0 -a propio -b 00:11:22:33:44:55 -c 0 -q \u0026amp;\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/02a33b1035a307453a1da6ce0a1bf3676be287d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/13cba3f837903f7184d6e9b6137d5165ffe82a8f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4eceb7eae6ea7c950384c34e6dbbe872c981935f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/784b78295a3a58bf052339dd669e6e03710220d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/87d076987a9ba106c83412fcd113656f71af05a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6644aeb8ddf196dec5f8e782293c36f065df4d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e033da39fc6abbddab6c29624acef80757f273fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6205f8215f12a96518ac9469ff76294ae7bd612\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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