CVE-2025-38037 (GCVE-0-2025-38037)

Vulnerability from cvelistv5 – Published: 2025-06-18 09:33 – Updated: 2026-05-11 21:20
VLAI
Title
vxlan: Annotate FDB data races
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 &
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d342894c5d2f8c7df194c793ec4059656e09ca31 , < 02a33b1035a307453a1da6ce0a1bf3676be287d7 (git)
Affected: d342894c5d2f8c7df194c793ec4059656e09ca31 , < 87d076987a9ba106c83412fcd113656f71af05a1 (git)
Affected: d342894c5d2f8c7df194c793ec4059656e09ca31 , < e033da39fc6abbddab6c29624acef80757f273fa (git)
Affected: d342894c5d2f8c7df194c793ec4059656e09ca31 , < 784b78295a3a58bf052339dd669e6e03710220d3 (git)
Affected: d342894c5d2f8c7df194c793ec4059656e09ca31 , < 13cba3f837903f7184d6e9b6137d5165ffe82a8f (git)
Affected: d342894c5d2f8c7df194c793ec4059656e09ca31 , < a6644aeb8ddf196dec5f8e782293c36f065df4d7 (git)
Affected: d342894c5d2f8c7df194c793ec4059656e09ca31 , < 4eceb7eae6ea7c950384c34e6dbbe872c981935f (git)
Affected: d342894c5d2f8c7df194c793ec4059656e09ca31 , < f6205f8215f12a96518ac9469ff76294ae7bd612 (git)
Create a notification for this product.
Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 5.4.294 , ≤ 5.4.* (semver)
Unaffected: 5.10.238 , ≤ 5.10.* (semver)
Unaffected: 5.15.185 , ≤ 5.15.* (semver)
Unaffected: 6.1.141 , ≤ 6.1.* (semver)
Unaffected: 6.6.93 , ≤ 6.6.* (semver)
Unaffected: 6.12.31 , ≤ 6.12.* (semver)
Unaffected: 6.14.9 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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      "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"
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/02a33b1035a307453a1da6ce0a1bf3676be287d7"
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        {
          "url": "https://git.kernel.org/stable/c/87d076987a9ba106c83412fcd113656f71af05a1"
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        {
          "url": "https://git.kernel.org/stable/c/f6205f8215f12a96518ac9469ff76294ae7bd612"
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      "title": "vxlan: Annotate FDB data races",
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  "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": "2026-05-11T21:20:04.072Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38037\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T10:15:36.030\",\"lastModified\":\"2025-12-18T21:36:09.150\",\"vulnStatus\":\"Analyzed\",\"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\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.7\",\"versionEndExcluding\":\"5.4.294\",\"matchCriteriaId\":\"D5472512-F3A1-4BB5-92C2-E32A9AD7740F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.238\",\"matchCriteriaId\":\"0DAAEF7F-D560-47FC-8B65-20404DB82432\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.185\",\"matchCriteriaId\":\"E11820B2-24BD-40A8-9E6B-5BC447252321\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.141\",\"matchCriteriaId\":\"7CEA8241-A858-4009-B4EE-31C62772811A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.93\",\"matchCriteriaId\":\"50A4A9DE-24AB-4FB4-AACD-85D8EABB0571\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.31\",\"matchCriteriaId\":\"1AE98841-5774-4B45-A81C-2D188DB7E5C3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.14.9\",\"matchCriteriaId\":\"A9B72DD1-715C-4101-A720-1C8D70044C06\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/02a33b1035a307453a1da6ce0a1bf3676be287d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/13cba3f837903f7184d6e9b6137d5165ffe82a8f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4eceb7eae6ea7c950384c34e6dbbe872c981935f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/784b78295a3a58bf052339dd669e6e03710220d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/87d076987a9ba106c83412fcd113656f71af05a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a6644aeb8ddf196dec5f8e782293c36f065df4d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e033da39fc6abbddab6c29624acef80757f273fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f6205f8215f12a96518ac9469ff76294ae7bd612\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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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.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.