CVE-2025-38443 (GCVE-0-2025-38443)
Vulnerability from cvelistv5
Published
2025-07-25 15:27
Modified
2025-07-28 04:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: fix uaf in nbd_genl_connect() error path There is a use-after-free issue in nbd: block nbd6: Receive control failed (result -104) block nbd6: shutting down sockets ================================================================== BUG: KASAN: slab-use-after-free in recv_work+0x694/0xa80 drivers/block/nbd.c:1022 Write of size 4 at addr ffff8880295de478 by task kworker/u33:0/67 CPU: 2 UID: 0 PID: 67 Comm: kworker/u33:0 Not tainted 6.15.0-rc5-syzkaller-00123-g2c89c1b655c0 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: nbd6-recv recv_work Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_dec include/linux/atomic/atomic-instrumented.h:592 [inline] recv_work+0x694/0xa80 drivers/block/nbd.c:1022 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> nbd_genl_connect() does not properly stop the device on certain error paths after nbd_start_device() has been called. This causes the error path to put nbd->config while recv_work continue to use the config after putting it, leading to use-after-free in recv_work. This patch moves nbd_start_device() after the backend file creation.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6497ef8df568afbf5f3e38825a4590ff41611a54
Version: 6497ef8df568afbf5f3e38825a4590ff41611a54
Version: 6497ef8df568afbf5f3e38825a4590ff41611a54
Version: 6497ef8df568afbf5f3e38825a4590ff41611a54
Version: 6497ef8df568afbf5f3e38825a4590ff41611a54
Version: 6497ef8df568afbf5f3e38825a4590ff41611a54
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/nbd.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "unaffected",
              "version": "6.6.99",
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              "version": "6.12.39",
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              "version": "6.15.7",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix uaf in nbd_genl_connect() error path\n\nThere is a use-after-free issue in nbd:\n\nblock nbd6: Receive control failed (result -104)\nblock nbd6: shutting down sockets\n==================================================================\nBUG: KASAN: slab-use-after-free in recv_work+0x694/0xa80 drivers/block/nbd.c:1022\nWrite of size 4 at addr ffff8880295de478 by task kworker/u33:0/67\n\nCPU: 2 UID: 0 PID: 67 Comm: kworker/u33:0 Not tainted 6.15.0-rc5-syzkaller-00123-g2c89c1b655c0 #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nWorkqueue: nbd6-recv recv_work\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xc3/0x670 mm/kasan/report.c:521\n kasan_report+0xe0/0x110 mm/kasan/report.c:634\n check_region_inline mm/kasan/generic.c:183 [inline]\n kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189\n instrument_atomic_read_write include/linux/instrumented.h:96 [inline]\n atomic_dec include/linux/atomic/atomic-instrumented.h:592 [inline]\n recv_work+0x694/0xa80 drivers/block/nbd.c:1022\n process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238\n process_scheduled_works kernel/workqueue.c:3319 [inline]\n worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400\n kthread+0x3c2/0x780 kernel/kthread.c:464\n ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\nnbd_genl_connect() does not properly stop the device on certain\nerror paths after nbd_start_device() has been called. This causes\nthe error path to put nbd-\u003econfig while recv_work continue to use\nthe config after putting it, leading to use-after-free in recv_work.\n\nThis patch moves nbd_start_device() after the backend file creation."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:22:25.589Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cb121c47f364b51776c4db904a6a5a90ab0a7ec5"
        },
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          "url": "https://git.kernel.org/stable/c/91fa560c73a8126868848ed6cd70607cbf8d87e2"
        },
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          "url": "https://git.kernel.org/stable/c/d46186eb7bbd9a11c145120f2d77effa8d4d44c2"
        },
        {
          "url": "https://git.kernel.org/stable/c/8586552df591e0a367eff44af0c586213eeecc3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/002aca89753f666d878ca0eb8584c372684ac4ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa9552438ebf015fc5f9f890dbfe39f0c53cf37e"
        }
      ],
      "title": "nbd: fix uaf in nbd_genl_connect() error path",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38443",
    "datePublished": "2025-07-25T15:27:26.671Z",
    "dateReserved": "2025-04-16T04:51:24.017Z",
    "dateUpdated": "2025-07-28T04:22:25.589Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38443\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-25T16:15:29.737\",\"lastModified\":\"2025-07-29T14:14:55.157\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnbd: fix uaf in nbd_genl_connect() error path\\n\\nThere is a use-after-free issue in nbd:\\n\\nblock nbd6: Receive control failed (result -104)\\nblock nbd6: shutting down sockets\\n==================================================================\\nBUG: KASAN: slab-use-after-free in recv_work+0x694/0xa80 drivers/block/nbd.c:1022\\nWrite of size 4 at addr ffff8880295de478 by task kworker/u33:0/67\\n\\nCPU: 2 UID: 0 PID: 67 Comm: kworker/u33:0 Not tainted 6.15.0-rc5-syzkaller-00123-g2c89c1b655c0 #0 PREEMPT(full)\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\\nWorkqueue: nbd6-recv recv_work\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:94 [inline]\\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\\n print_address_description mm/kasan/report.c:408 [inline]\\n print_report+0xc3/0x670 mm/kasan/report.c:521\\n kasan_report+0xe0/0x110 mm/kasan/report.c:634\\n check_region_inline mm/kasan/generic.c:183 [inline]\\n kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189\\n instrument_atomic_read_write include/linux/instrumented.h:96 [inline]\\n atomic_dec include/linux/atomic/atomic-instrumented.h:592 [inline]\\n recv_work+0x694/0xa80 drivers/block/nbd.c:1022\\n process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238\\n process_scheduled_works kernel/workqueue.c:3319 [inline]\\n worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400\\n kthread+0x3c2/0x780 kernel/kthread.c:464\\n ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153\\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\\n \u003c/TASK\u003e\\n\\nnbd_genl_connect() does not properly stop the device on certain\\nerror paths after nbd_start_device() has been called. This causes\\nthe error path to put nbd-\u003econfig while recv_work continue to use\\nthe config after putting it, leading to use-after-free in recv_work.\\n\\nThis patch moves nbd_start_device() after the backend file creation.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nbd: correcci\u00f3n de uaf en la ruta de error nbd_genl_connect() Hay un problema de use-after-free en nbd: bloque nbd6: Error en el control de recepci\u00f3n (resultado -104) bloque nbd6: apagado de sockets ================================================================== BUG: KASAN: slab-use-after-free in recv_work+0x694/0xa80 drivers/block/nbd.c:1022 Write of size 4 at addr ffff8880295de478 by task kworker/u33:0/67 CPU: 2 UID: 0 PID: 67 Comm: kworker/u33:0 Not tainted 6.15.0-rc5-syzkaller-00123-g2c89c1b655c0 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: nbd6-recv recv_work Call Trace:  __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_dec include/linux/atomic/atomic-instrumented.h:592 [inline] recv_work+0x694/0xa80 drivers/block/nbd.c:1022 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245  nbd_genl_connect() no detiene correctamente el dispositivo en ciertas rutas de error despu\u00e9s de llamar a nbd_start_device(). Esto provoca que la ruta de error coloque nbd-\u0026gt;config mientras que recv_work sigue usando la configuraci\u00f3n despu\u00e9s de colocarla, lo que provoca un error de use-after-free en recv_work. Esta correcci\u00f3n mueve nbd_start_device() despu\u00e9s de la creaci\u00f3n del archivo de backend.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/002aca89753f666d878ca0eb8584c372684ac4ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8586552df591e0a367eff44af0c586213eeecc3f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91fa560c73a8126868848ed6cd70607cbf8d87e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa9552438ebf015fc5f9f890dbfe39f0c53cf37e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb121c47f364b51776c4db904a6a5a90ab0a7ec5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d46186eb7bbd9a11c145120f2d77effa8d4d44c2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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