CVE-2025-38666 (GCVE-0-2025-38666)
Vulnerability from cvelistv5
Published
2025-08-22 16:02
Modified
2025-11-03 17:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: appletalk: Fix use-after-free in AARP proxy probe The AARP proxy‐probe routine (aarp_proxy_probe_network) sends a probe, releases the aarp_lock, sleeps, then re-acquires the lock. During that window an expire timer thread (__aarp_expire_timer) can remove and kfree() the same entry, leading to a use-after-free. race condition: cpu 0 | cpu 1 atalk_sendmsg() | atif_proxy_probe_device() aarp_send_ddp() | aarp_proxy_probe_network() mod_timer() | lock(aarp_lock) // LOCK!! timeout around 200ms | alloc(aarp_entry) and then call | proxies[hash] = aarp_entry aarp_expire_timeout() | aarp_send_probe() | unlock(aarp_lock) // UNLOCK!! lock(aarp_lock) // LOCK!! | msleep(100); __aarp_expire_timer(&proxies[ct]) | free(aarp_entry) | unlock(aarp_lock) // UNLOCK!! | | lock(aarp_lock) // LOCK!! | UAF aarp_entry !! ================================================================== BUG: KASAN: slab-use-after-free in aarp_proxy_probe_network+0x560/0x630 net/appletalk/aarp.c:493 Read of size 4 at addr ffff8880123aa360 by task repro/13278 CPU: 3 UID: 0 PID: 13278 Comm: repro Not tainted 6.15.2 #3 PREEMPT(full) Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1b0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xc1/0x630 mm/kasan/report.c:521 kasan_report+0xca/0x100 mm/kasan/report.c:634 aarp_proxy_probe_network+0x560/0x630 net/appletalk/aarp.c:493 atif_proxy_probe_device net/appletalk/ddp.c:332 [inline] atif_ioctl+0xb58/0x16c0 net/appletalk/ddp.c:857 atalk_ioctl+0x198/0x2f0 net/appletalk/ddp.c:1818 sock_do_ioctl+0xdc/0x260 net/socket.c:1190 sock_ioctl+0x239/0x6a0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x194/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcb/0x250 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> Allocated: aarp_alloc net/appletalk/aarp.c:382 [inline] aarp_proxy_probe_network+0xd8/0x630 net/appletalk/aarp.c:468 atif_proxy_probe_device net/appletalk/ddp.c:332 [inline] atif_ioctl+0xb58/0x16c0 net/appletalk/ddp.c:857 atalk_ioctl+0x198/0x2f0 net/appletalk/ddp.c:1818 Freed: kfree+0x148/0x4d0 mm/slub.c:4841 __aarp_expire net/appletalk/aarp.c:90 [inline] __aarp_expire_timer net/appletalk/aarp.c:261 [inline] aarp_expire_timeout+0x480/0x6e0 net/appletalk/aarp.c:317 The buggy address belongs to the object at ffff8880123aa300 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 96 bytes inside of freed 192-byte region [ffff8880123aa300, ffff8880123aa3c0) Memory state around the buggy address: ffff8880123aa200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880123aa280: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880123aa300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880123aa380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880123aa400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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          "dateUpdated": "2025-11-03T17:40:53.180Z",
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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\nnet: appletalk: Fix use-after-free in AARP proxy probe\n\nThe AARP proxy\u2010probe routine (aarp_proxy_probe_network) sends a probe,\nreleases the aarp_lock, sleeps, then re-acquires the lock.  During that\nwindow an expire timer thread (__aarp_expire_timer) can remove and\nkfree() the same entry, leading to a use-after-free.\n\nrace condition:\n\n         cpu 0                          |            cpu 1\n    atalk_sendmsg()                     |   atif_proxy_probe_device()\n    aarp_send_ddp()                     |   aarp_proxy_probe_network()\n    mod_timer()                         |   lock(aarp_lock) // LOCK!!\n    timeout around 200ms                |   alloc(aarp_entry)\n    and then call                       |   proxies[hash] = aarp_entry\n    aarp_expire_timeout()               |   aarp_send_probe()\n                                        |   unlock(aarp_lock) // UNLOCK!!\n    lock(aarp_lock) // LOCK!!           |   msleep(100);\n    __aarp_expire_timer(\u0026proxies[ct])   |\n    free(aarp_entry)                    |\n    unlock(aarp_lock) // UNLOCK!!       |\n                                        |   lock(aarp_lock) // LOCK!!\n                                        |   UAF aarp_entry !!\n\n==================================================================\nBUG: KASAN: slab-use-after-free in aarp_proxy_probe_network+0x560/0x630 net/appletalk/aarp.c:493\nRead of size 4 at addr ffff8880123aa360 by task repro/13278\n\nCPU: 3 UID: 0 PID: 13278 Comm: repro Not tainted 6.15.2 #3 PREEMPT(full)\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1b0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xc1/0x630 mm/kasan/report.c:521\n kasan_report+0xca/0x100 mm/kasan/report.c:634\n aarp_proxy_probe_network+0x560/0x630 net/appletalk/aarp.c:493\n atif_proxy_probe_device net/appletalk/ddp.c:332 [inline]\n atif_ioctl+0xb58/0x16c0 net/appletalk/ddp.c:857\n atalk_ioctl+0x198/0x2f0 net/appletalk/ddp.c:1818\n sock_do_ioctl+0xdc/0x260 net/socket.c:1190\n sock_ioctl+0x239/0x6a0 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl fs/ioctl.c:892 [inline]\n __x64_sys_ioctl+0x194/0x200 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcb/0x250 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \u003c/TASK\u003e\n\nAllocated:\n aarp_alloc net/appletalk/aarp.c:382 [inline]\n aarp_proxy_probe_network+0xd8/0x630 net/appletalk/aarp.c:468\n atif_proxy_probe_device net/appletalk/ddp.c:332 [inline]\n atif_ioctl+0xb58/0x16c0 net/appletalk/ddp.c:857\n atalk_ioctl+0x198/0x2f0 net/appletalk/ddp.c:1818\n\nFreed:\n kfree+0x148/0x4d0 mm/slub.c:4841\n __aarp_expire net/appletalk/aarp.c:90 [inline]\n __aarp_expire_timer net/appletalk/aarp.c:261 [inline]\n aarp_expire_timeout+0x480/0x6e0 net/appletalk/aarp.c:317\n\nThe buggy address belongs to the object at ffff8880123aa300\n which belongs to the cache kmalloc-192 of size 192\nThe buggy address is located 96 bytes inside of\n freed 192-byte region [ffff8880123aa300, ffff8880123aa3c0)\n\nMemory state around the buggy address:\n ffff8880123aa200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ffff8880123aa280: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc\n\u003effff8880123aa300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                                                       ^\n ffff8880123aa380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n ffff8880123aa400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n=================================================================="
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-28T14:44:33.349Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b35694ffabb2af308a1f725d70f60fd8a47d1f3e"
        },
        {
          "url": "https://git.kernel.org/stable/c/82d19a70ced28b17a38ebf1b6978c6c7db894979"
        },
        {
          "url": "https://git.kernel.org/stable/c/186942d19c0222617ef61f50e1dba91e269a5963"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a6209e4649d45fd85d4193abc481911858ffc6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e4f1564c5b699eb89b3040688fd6b4e57922f1f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f02ea0f63dd38c41539ea290fcc1693c73aa8e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/f90b6bb203f3f38bf2b3d976113d51571df9a482"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c4a92d07b0850342d3becf2e608f805e972467c"
        }
      ],
      "title": "net: appletalk: Fix use-after-free in AARP proxy probe",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38666",
    "datePublished": "2025-08-22T16:02:58.144Z",
    "dateReserved": "2025-04-16T04:51:24.031Z",
    "dateUpdated": "2025-11-03T17:40:53.180Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38666\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-22T16:15:42.000\",\"lastModified\":\"2025-11-03T18:16:33.727\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: appletalk: Fix use-after-free in AARP proxy probe\\n\\nThe AARP proxy\u2010probe routine (aarp_proxy_probe_network) sends a probe,\\nreleases the aarp_lock, sleeps, then re-acquires the lock.  During that\\nwindow an expire timer thread (__aarp_expire_timer) can remove and\\nkfree() the same entry, leading to a use-after-free.\\n\\nrace condition:\\n\\n         cpu 0                          |            cpu 1\\n    atalk_sendmsg()                     |   atif_proxy_probe_device()\\n    aarp_send_ddp()                     |   aarp_proxy_probe_network()\\n    mod_timer()                         |   lock(aarp_lock) // LOCK!!\\n    timeout around 200ms                |   alloc(aarp_entry)\\n    and then call                       |   proxies[hash] = aarp_entry\\n    aarp_expire_timeout()               |   aarp_send_probe()\\n                                        |   unlock(aarp_lock) // UNLOCK!!\\n    lock(aarp_lock) // LOCK!!           |   msleep(100);\\n    __aarp_expire_timer(\u0026proxies[ct])   |\\n    free(aarp_entry)                    |\\n    unlock(aarp_lock) // UNLOCK!!       |\\n                                        |   lock(aarp_lock) // LOCK!!\\n                                        |   UAF aarp_entry !!\\n\\n==================================================================\\nBUG: KASAN: slab-use-after-free in aarp_proxy_probe_network+0x560/0x630 net/appletalk/aarp.c:493\\nRead of size 4 at addr ffff8880123aa360 by task repro/13278\\n\\nCPU: 3 UID: 0 PID: 13278 Comm: repro Not tainted 6.15.2 #3 PREEMPT(full)\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:94 [inline]\\n dump_stack_lvl+0x116/0x1b0 lib/dump_stack.c:120\\n print_address_description mm/kasan/report.c:408 [inline]\\n print_report+0xc1/0x630 mm/kasan/report.c:521\\n kasan_report+0xca/0x100 mm/kasan/report.c:634\\n aarp_proxy_probe_network+0x560/0x630 net/appletalk/aarp.c:493\\n atif_proxy_probe_device net/appletalk/ddp.c:332 [inline]\\n atif_ioctl+0xb58/0x16c0 net/appletalk/ddp.c:857\\n atalk_ioctl+0x198/0x2f0 net/appletalk/ddp.c:1818\\n sock_do_ioctl+0xdc/0x260 net/socket.c:1190\\n sock_ioctl+0x239/0x6a0 net/socket.c:1311\\n vfs_ioctl fs/ioctl.c:51 [inline]\\n __do_sys_ioctl fs/ioctl.c:906 [inline]\\n __se_sys_ioctl fs/ioctl.c:892 [inline]\\n __x64_sys_ioctl+0x194/0x200 fs/ioctl.c:892\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0xcb/0x250 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n \u003c/TASK\u003e\\n\\nAllocated:\\n aarp_alloc net/appletalk/aarp.c:382 [inline]\\n aarp_proxy_probe_network+0xd8/0x630 net/appletalk/aarp.c:468\\n atif_proxy_probe_device net/appletalk/ddp.c:332 [inline]\\n atif_ioctl+0xb58/0x16c0 net/appletalk/ddp.c:857\\n atalk_ioctl+0x198/0x2f0 net/appletalk/ddp.c:1818\\n\\nFreed:\\n kfree+0x148/0x4d0 mm/slub.c:4841\\n __aarp_expire net/appletalk/aarp.c:90 [inline]\\n __aarp_expire_timer net/appletalk/aarp.c:261 [inline]\\n aarp_expire_timeout+0x480/0x6e0 net/appletalk/aarp.c:317\\n\\nThe buggy address belongs to the object at ffff8880123aa300\\n which belongs to the cache kmalloc-192 of size 192\\nThe buggy address is located 96 bytes inside of\\n freed 192-byte region [ffff8880123aa300, ffff8880123aa3c0)\\n\\nMemory state around the buggy address:\\n ffff8880123aa200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n ffff8880123aa280: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc\\n\u003effff8880123aa300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n                                                       ^\\n ffff8880123aa380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\\n ffff8880123aa400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n==================================================================\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: appletalk: Correcci\u00f3n del use-after-free en la sonda de proxy AARP. La rutina de sonda de proxy AARP (aarp_proxy_probe_network) env\u00eda una sonda, libera el bloqueo aarp_lock, se suspende y luego vuelve a adquirir el bloqueo. Durante ese per\u00edodo, un subproceso del temporizador de expiraci\u00f3n (__aarp_expire_timer) puede eliminar y ejecutar kfree() en la misma entrada, lo que provoca un use-after-free. condici\u00f3n de ejecuci\u00f3n: cpu 0 | cpu 1 atalk_sendmsg() | atif_proxy_probe_device() aarp_send_ddp() | aarp_proxy_probe_network() mod_timer() | lock(aarp_lock) // \u00a1BLOQUEO! tiempo de espera de unos 200 ms | alloc(aarp_entry) y luego llamar a | proxies[hash] = aarp_entry aarp_expire_timeout() | aarp_send_probe() | unlock(aarp_lock) // \u00a1DESBLOQUEAR! lock(aarp_lock) // \u00a1BLOQUEAR! | msleep(100); __aarp_expire_timer(\u0026amp;proxies[ct]) | free(aarp_entry) | unlock(aarp_lock) // \u00a1DESBLOQUEAR! | | lock(aarp_lock) // \u00a1BLOQUEAR! | UAF aarp_entry !! ====================================================================== ERROR: KASAN: slab-use-after-free en aarp_proxy_probe_network+0x560/0x630 net/appletalk/aarp.c:493 Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff8880123aa360 por la tarea repro/13278 CPU: 3 UID: 0 PID: 13278 Comm: repro No contaminado 6.15.2 #3 PREEMPT(full) Rastreo de llamadas:  __dump_stack lib/dump_stack.c:94 [en l\u00ednea] dump_stack_lvl+0x116/0x1b0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [en l\u00ednea] print_report+0xc1/0x630 mm/kasan/report.c:521 kasan_report+0xca/0x100 mm/kasan/report.c:634 aarp_proxy_probe_network+0x560/0x630 net/appletalk/aarp.c:493 atif_proxy_probe_device net/appletalk/ddp.c:332 [en l\u00ednea] atif_ioctl+0xb58/0x16c0 net/appletalk/ddp.c:857 atalk_ioctl+0x198/0x2f0 net/appletalk/ddp.c:1818 sock_do_ioctl+0xdc/0x260 net/socket.c:1190 sock_ioctl+0x239/0x6a0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [en l\u00ednea] __do_sys_ioctl fs/ioctl.c:906 [en l\u00ednea] __se_sys_ioctl fs/ioctl.c:892 [en l\u00ednea] __x64_sys_ioctl+0x194/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [en l\u00ednea] do_syscall_64+0xcb/0x250 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f  Asignado: aarp_alloc net/appletalk/aarp.c:382 [en l\u00ednea] aarp_proxy_probe_network+0xd8/0x630 net/appletalk/aarp.c:468 atif_proxy_probe_device net/appletalk/ddp.c:332 [en l\u00ednea] atif_ioctl+0xb58/0x16c0 net/appletalk/ddp.c:857 atalk_ioctl+0x198/0x2f0 net/appletalk/ddp.c:1818 Liberado: kfree+0x148/0x4d0 mm/slub.c:4841 __aarp_expire net/appletalk/aarp.c:90 [inline] __aarp_expire_timer net/appletalk/aarp.c:261 [inline] aarp_expire_timeout+0x480/0x6e0 net/appletalk/aarp.c:317 La direcci\u00f3n con errores pertenece al objeto en ffff8880123aa300 que pertenece a la cach\u00e9 kmalloc-192 de tama\u00f1o 192 La direcci\u00f3n con errores se encuentra 96 bytes dentro de la regi\u00f3n liberada de 192 bytes [ffff8880123aa300, ffff8880123aa3c0) Estado de la memoria alrededor de la direcci\u00f3n con errores: ffff8880123aa200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880123aa280: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc \u0026gt;ffff8880123aa300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880123aa380: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ffff8880123aa400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/186942d19c0222617ef61f50e1dba91e269a5963\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2a6209e4649d45fd85d4193abc481911858ffc6f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f02ea0f63dd38c41539ea290fcc1693c73aa8e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6c4a92d07b0850342d3becf2e608f805e972467c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82d19a70ced28b17a38ebf1b6978c6c7db894979\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b35694ffabb2af308a1f725d70f60fd8a47d1f3e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e4f1564c5b699eb89b3040688fd6b4e57922f1f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f90b6bb203f3f38bf2b3d976113d51571df9a482\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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