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CVE-2025-40064 (GCVE-0-2025-40064)

Vulnerability from cvelistv5 – Published: 2025-10-28 11:48 – Updated: 2026-09-02 12:49
VLAI
Title
smc: Fix use-after-free in __pnet_find_base_ndev().
Summary
In the Linux kernel, the following vulnerability has been resolved: smc: Fix use-after-free in __pnet_find_base_ndev(). syzbot reported use-after-free of net_device in __pnet_find_base_ndev(), which was called during connect(). [0] smc_pnet_find_ism_resource() fetches sk_dst_get(sk)->dev and passes down to pnet_find_base_ndev(), where RTNL is held. Then, UAF happened at __pnet_find_base_ndev() when the dev is first used. This means dev had already been freed before acquiring RTNL in pnet_find_base_ndev(). While dev is going away, dst->dev could be swapped with blackhole_netdev, and the dev's refcnt by dst will be released. We must hold dev's refcnt before calling smc_pnet_find_ism_resource(). Also, smc_pnet_find_roce_resource() has the same problem. Let's use __sk_dst_get() and dst_dev_rcu() in the two functions. [0]: BUG: KASAN: use-after-free in __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926 Read of size 1 at addr ffff888036bac33a by task syz.0.3632/18609 CPU: 1 UID: 0 PID: 18609 Comm: syz.0.3632 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: <TASK> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926 pnet_find_base_ndev net/smc/smc_pnet.c:946 [inline] smc_pnet_find_ism_by_pnetid net/smc/smc_pnet.c:1103 [inline] smc_pnet_find_ism_resource+0xef/0x390 net/smc/smc_pnet.c:1154 smc_find_ism_device net/smc/af_smc.c:1030 [inline] smc_find_proposal_devices net/smc/af_smc.c:1115 [inline] __smc_connect+0x372/0x1890 net/smc/af_smc.c:1545 smc_connect+0x877/0xd90 net/smc/af_smc.c:1715 __sys_connect_file net/socket.c:2086 [inline] __sys_connect+0x313/0x440 net/socket.c:2105 __do_sys_connect net/socket.c:2111 [inline] __se_sys_connect net/socket.c:2108 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2108 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f47cbf8eba9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f47ccdb1038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f47cc1d5fa0 RCX: 00007f47cbf8eba9 RDX: 0000000000000010 RSI: 0000200000000280 RDI: 000000000000000b RBP: 00007f47cc011e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f47cc1d6038 R14: 00007f47cc1d5fa0 R15: 00007ffc512f8aa8 </TASK> The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888036bacd00 pfn:0x36bac flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0001243d08 ffff8880b863fdc0 0000000000000000 raw: ffff888036bacd00 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 2, migratetype Unmovable, gfp_mask 0x446dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP), pid 16741, tgid 16741 (syz-executor), ts 343313197788, free_ts 380670750466 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:4317 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:4348 __do_kmalloc_node mm/slub.c:4364 [inline] __kvmalloc_node ---truncated---
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 19:39 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0afff91c6f5ecef27715ea71e34dc2baacba1060 , < 005a7173d8e4710646043a681af36f79ce05a29b (git)
Affected: 0afff91c6f5ecef27715ea71e34dc2baacba1060 , < 302dbed4760bcd19a661cc1c282d91bb7481307e (git)
Affected: 0afff91c6f5ecef27715ea71e34dc2baacba1060 , < 08aca586482e88aab9616a3e81bc36cad22674a5 (git)
Affected: 0afff91c6f5ecef27715ea71e34dc2baacba1060 , < 233927b645cb7a14bb98d23ac72e4c7243a9f0d9 (git)
Affected: 0afff91c6f5ecef27715ea71e34dc2baacba1060 , < 3d3466878afd8d43ec0ca2facfbc7f03e40d0f79 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                "id": "CVE-2025-40064",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmc: Fix use-after-free in __pnet_find_base_ndev().\n\nsyzbot reported use-after-free of net_device in __pnet_find_base_ndev(),\nwhich was called during connect(). [0]\n\nsmc_pnet_find_ism_resource() fetches sk_dst_get(sk)-\u003edev and passes\ndown to pnet_find_base_ndev(), where RTNL is held.  Then, UAF happened\nat __pnet_find_base_ndev() when the dev is first used.\n\nThis means dev had already been freed before acquiring RTNL in\npnet_find_base_ndev().\n\nWhile dev is going away, dst-\u003edev could be swapped with blackhole_netdev,\nand the dev\u0027s refcnt by dst will be released.\n\nWe must hold dev\u0027s refcnt before calling smc_pnet_find_ism_resource().\n\nAlso, smc_pnet_find_roce_resource() has the same problem.\n\nLet\u0027s use __sk_dst_get() and dst_dev_rcu() in the two functions.\n\n[0]:\nBUG: KASAN: use-after-free in __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926\nRead of size 1 at addr ffff888036bac33a by task syz.0.3632/18609\n\nCPU: 1 UID: 0 PID: 18609 Comm: syz.0.3632 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xca/0x240 mm/kasan/report.c:482\n kasan_report+0x118/0x150 mm/kasan/report.c:595\n __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926\n pnet_find_base_ndev net/smc/smc_pnet.c:946 [inline]\n smc_pnet_find_ism_by_pnetid net/smc/smc_pnet.c:1103 [inline]\n smc_pnet_find_ism_resource+0xef/0x390 net/smc/smc_pnet.c:1154\n smc_find_ism_device net/smc/af_smc.c:1030 [inline]\n smc_find_proposal_devices net/smc/af_smc.c:1115 [inline]\n __smc_connect+0x372/0x1890 net/smc/af_smc.c:1545\n smc_connect+0x877/0xd90 net/smc/af_smc.c:1715\n __sys_connect_file net/socket.c:2086 [inline]\n __sys_connect+0x313/0x440 net/socket.c:2105\n __do_sys_connect net/socket.c:2111 [inline]\n __se_sys_connect net/socket.c:2108 [inline]\n __x64_sys_connect+0x7a/0x90 net/socket.c:2108\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f47cbf8eba9\nCode: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f47ccdb1038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a\nRAX: ffffffffffffffda RBX: 00007f47cc1d5fa0 RCX: 00007f47cbf8eba9\nRDX: 0000000000000010 RSI: 0000200000000280 RDI: 000000000000000b\nRBP: 00007f47cc011e19 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007f47cc1d6038 R14: 00007f47cc1d5fa0 R15: 00007ffc512f8aa8\n \u003c/TASK\u003e\n\nThe buggy address belongs to the physical page:\npage: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888036bacd00 pfn:0x36bac\nflags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)\nraw: 00fff00000000000 ffffea0001243d08 ffff8880b863fdc0 0000000000000000\nraw: ffff888036bacd00 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\npage_owner tracks the page as freed\npage last allocated via order 2, migratetype Unmovable, gfp_mask 0x446dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP), pid 16741, tgid 16741 (syz-executor), ts 343313197788, free_ts 380670750466\n set_page_owner include/linux/page_owner.h:32 [inline]\n post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851\n prep_new_page mm/page_alloc.c:1859 [inline]\n get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858\n __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148\n alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416\n ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:4317\n __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:4348\n __do_kmalloc_node mm/slub.c:4364 [inline]\n __kvmalloc_node\n---truncated---"
        }
      ],
      "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 vulnerability is triggered through the connect() syscall on a locally created AF_SMC socket, combined with locally driven netdev teardown (rtnl_dellink) to free the device. Although the same helpers are also reached from the server-side listen path, the freeing side of the race is not remotely controllable, so local access is the realistic delivery vector.\nAC:L - The attacker controls both sides of the race: they create the netdev and route in their own network namespace, initiate the SMC connect that caches the dst, and delete the device concurrently; the reader blocks on rtnl_lock held by the deleting task and dereferences the device immediately after netdev_run_todo() frees it, making the window wide and the trigger reliably repeatable in a loop.\nPR:L - No capability check exists on AF_SMC socket creation and the module autoloads via net-pf-43 for unprivileged users; the netdev create/delete side needs only CAP_NET_ADMIN inside a user+network namespace obtainable with unshare -Urn by any unprivileged local user.\nUI:N - The attacker performs every step \u2014 socket creation, local SMC listener, connect, and device deletion \u2014 with no action required from any other user or administrator.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed net_device is read and its adj_list is walked, yielding an attacker-influenceable pointer that is further dereferenced (dev.parent, dev_port, dev_net()-\u003enet_generic()); with a page-level heap spray of the freed kvmalloc allocation this provides an arbitrary-read oriented primitive over kernel memory.\nI:H - Controlling the freed net_device contents lets the attacker steer base_ndev to a crafted address that is then used for mutex_lock(\u0026pnettable-\u003elock) and list traversal, giving a controlled write/corruption primitive suitable for privilege escalation.\nA:H - The use-after-free reliably produces a KASAN-detected invalid access and, on production kernels, wild-pointer dereferences leading to kernel oops or panic, and it can be re-triggered at will."
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-02T12:49:24.811Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/005a7173d8e4710646043a681af36f79ce05a29b"
        },
        {
          "url": "https://git.kernel.org/stable/c/302dbed4760bcd19a661cc1c282d91bb7481307e"
        },
        {
          "url": "https://git.kernel.org/stable/c/08aca586482e88aab9616a3e81bc36cad22674a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/233927b645cb7a14bb98d23ac72e4c7243a9f0d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d3466878afd8d43ec0ca2facfbc7f03e40d0f79"
        }
      ],
      "title": "smc: Fix use-after-free in __pnet_find_base_ndev().",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40064",
    "datePublished": "2025-10-28T11:48:35.155Z",
    "dateReserved": "2025-04-16T07:20:57.159Z",
    "dateUpdated": "2026-09-02T12:49:24.811Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40064",
      "date": "2026-09-05",
      "epss": "0.0014",
      "percentile": "0.03601"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-28T01:46:26.000Z",
      "cve": "CVE-2025-40064",
      "id": "msrc_CVE-2025-40064",
      "initial_release_date": "2025-10-02T00:00:00.000Z",
      "product_status:known_affected": "14",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "smc: Fix use-after-free in __pnet_find_base_ndev().",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40064.json",
      "version": "14"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40064\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-28T12:15:40.840\",\"lastModified\":\"2026-09-02T13:16:49.977\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmc: Fix use-after-free in __pnet_find_base_ndev().\\n\\nsyzbot reported use-after-free of net_device in __pnet_find_base_ndev(),\\nwhich was called during connect(). [0]\\n\\nsmc_pnet_find_ism_resource() fetches sk_dst_get(sk)-\u003edev and passes\\ndown to pnet_find_base_ndev(), where RTNL is held.  Then, UAF happened\\nat __pnet_find_base_ndev() when the dev is first used.\\n\\nThis means dev had already been freed before acquiring RTNL in\\npnet_find_base_ndev().\\n\\nWhile dev is going away, dst-\u003edev could be swapped with blackhole_netdev,\\nand the dev\u0027s refcnt by dst will be released.\\n\\nWe must hold dev\u0027s refcnt before calling smc_pnet_find_ism_resource().\\n\\nAlso, smc_pnet_find_roce_resource() has the same problem.\\n\\nLet\u0027s use __sk_dst_get() and dst_dev_rcu() in the two functions.\\n\\n[0]:\\nBUG: KASAN: use-after-free in __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926\\nRead of size 1 at addr ffff888036bac33a by task syz.0.3632/18609\\n\\nCPU: 1 UID: 0 PID: 18609 Comm: syz.0.3632 Not tainted syzkaller #0 PREEMPT(full)\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\\n print_address_description mm/kasan/report.c:378 [inline]\\n print_report+0xca/0x240 mm/kasan/report.c:482\\n kasan_report+0x118/0x150 mm/kasan/report.c:595\\n __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926\\n pnet_find_base_ndev net/smc/smc_pnet.c:946 [inline]\\n smc_pnet_find_ism_by_pnetid net/smc/smc_pnet.c:1103 [inline]\\n smc_pnet_find_ism_resource+0xef/0x390 net/smc/smc_pnet.c:1154\\n smc_find_ism_device net/smc/af_smc.c:1030 [inline]\\n smc_find_proposal_devices net/smc/af_smc.c:1115 [inline]\\n __smc_connect+0x372/0x1890 net/smc/af_smc.c:1545\\n smc_connect+0x877/0xd90 net/smc/af_smc.c:1715\\n __sys_connect_file net/socket.c:2086 [inline]\\n __sys_connect+0x313/0x440 net/socket.c:2105\\n __do_sys_connect net/socket.c:2111 [inline]\\n __se_sys_connect net/socket.c:2108 [inline]\\n __x64_sys_connect+0x7a/0x90 net/socket.c:2108\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nRIP: 0033:0x7f47cbf8eba9\\nCode: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48\\nRSP: 002b:00007f47ccdb1038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a\\nRAX: ffffffffffffffda RBX: 00007f47cc1d5fa0 RCX: 00007f47cbf8eba9\\nRDX: 0000000000000010 RSI: 0000200000000280 RDI: 000000000000000b\\nRBP: 00007f47cc011e19 R08: 0000000000000000 R09: 0000000000000000\\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\\nR13: 00007f47cc1d6038 R14: 00007f47cc1d5fa0 R15: 00007ffc512f8aa8\\n \u003c/TASK\u003e\\n\\nThe buggy address belongs to the physical page:\\npage: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888036bacd00 pfn:0x36bac\\nflags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)\\nraw: 00fff00000000000 ffffea0001243d08 ffff8880b863fdc0 0000000000000000\\nraw: ffff888036bacd00 0000000000000000 00000000ffffffff 0000000000000000\\npage dumped because: kasan: bad access detected\\npage_owner tracks the page as freed\\npage last allocated via order 2, migratetype Unmovable, gfp_mask 0x446dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP), pid 16741, tgid 16741 (syz-executor), ts 343313197788, free_ts 380670750466\\n set_page_owner include/linux/page_owner.h:32 [inline]\\n post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851\\n prep_new_page mm/page_alloc.c:1859 [inline]\\n get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858\\n __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148\\n alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416\\n ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:4317\\n __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:4348\\n __do_kmalloc_node mm/slub.c:4364 [inline]\\n __kvmalloc_node\\n---truncated---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/smc/smc_pnet.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0afff91c6f5ecef27715ea71e34dc2baacba1060\",\"lessThan\":\"005a7173d8e4710646043a681af36f79ce05a29b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0afff91c6f5ecef27715ea71e34dc2baacba1060\",\"lessThan\":\"302dbed4760bcd19a661cc1c282d91bb7481307e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0afff91c6f5ecef27715ea71e34dc2baacba1060\",\"lessThan\":\"08aca586482e88aab9616a3e81bc36cad22674a5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0afff91c6f5ecef27715ea71e34dc2baacba1060\",\"lessThan\":\"233927b645cb7a14bb98d23ac72e4c7243a9f0d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0afff91c6f5ecef27715ea71e34dc2baacba1060\",\"lessThan\":\"3d3466878afd8d43ec0ca2facfbc7f03e40d0f79\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/smc/smc_pnet.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.187\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.156\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.108\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17.3\",\"lessThanOrEqual\":\"6.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-16T19:39:09.971835Z\",\"id\":\"CVE-2025-40064\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/005a7173d8e4710646043a681af36f79ce05a29b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/08aca586482e88aab9616a3e81bc36cad22674a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/233927b645cb7a14bb98d23ac72e4c7243a9f0d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/302dbed4760bcd19a661cc1c282d91bb7481307e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3d3466878afd8d43ec0ca2facfbc7f03e40d0f79\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-04T08:02:34+00:00",
      "cve": "CVE-2025-40064",
      "id": "CVE-2025-40064",
      "initial_release_date": "2025-10-28T00:00:00+00:00",
      "product_status:fixed": "1970",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smc: Fix use-after-free in __pnet_find_base_ndev()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40064.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-40064\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-16T19:39:09.971835Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-16T19:39:15.695Z\"}}], \"cna\": {\"title\": \"smc: Fix use-after-free in __pnet_find_base_ndev().\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerability is triggered through the connect() syscall on a locally created AF_SMC socket, combined with locally driven netdev teardown (rtnl_dellink) to free the device. Although the same helpers are also reached from the server-side listen path, the freeing side of the race is not remotely controllable, so local access is the realistic delivery vector.\\nAC:L - The attacker controls both sides of the race: they create the netdev and route in their own network namespace, initiate the SMC connect that caches the dst, and delete the device concurrently; the reader blocks on rtnl_lock held by the deleting task and dereferences the device immediately after netdev_run_todo() frees it, making the window wide and the trigger reliably repeatable in a loop.\\nPR:L - No capability check exists on AF_SMC socket creation and the module autoloads via net-pf-43 for unprivileged users; the netdev create/delete side needs only CAP_NET_ADMIN inside a user+network namespace obtainable with unshare -Urn by any unprivileged local user.\\nUI:N - The attacker performs every step \\u2014 socket creation, local SMC listener, connect, and device deletion \\u2014 with no action required from any other user or administrator.\\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The freed net_device is read and its adj_list is walked, yielding an attacker-influenceable pointer that is further dereferenced (dev.parent, dev_port, dev_net()-\u003enet_generic()); with a page-level heap spray of the freed kvmalloc allocation this provides an arbitrary-read oriented primitive over kernel memory.\\nI:H - Controlling the freed net_device contents lets the attacker steer base_ndev to a crafted address that is then used for mutex_lock(\u0026pnettable-\u003elock) and list traversal, giving a controlled write/corruption primitive suitable for privilege escalation.\\nA:H - The use-after-free reliably produces a KASAN-detected invalid access and, on production kernels, wild-pointer dereferences leading to kernel oops or panic, and it can be re-triggered at will.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0afff91c6f5ecef27715ea71e34dc2baacba1060\", \"lessThan\": \"005a7173d8e4710646043a681af36f79ce05a29b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0afff91c6f5ecef27715ea71e34dc2baacba1060\", \"lessThan\": \"302dbed4760bcd19a661cc1c282d91bb7481307e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0afff91c6f5ecef27715ea71e34dc2baacba1060\", \"lessThan\": \"08aca586482e88aab9616a3e81bc36cad22674a5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0afff91c6f5ecef27715ea71e34dc2baacba1060\", \"lessThan\": \"233927b645cb7a14bb98d23ac72e4c7243a9f0d9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0afff91c6f5ecef27715ea71e34dc2baacba1060\", \"lessThan\": \"3d3466878afd8d43ec0ca2facfbc7f03e40d0f79\", \"versionType\": \"git\"}], \"programFiles\": [\"net/smc/smc_pnet.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.19\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.19\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.187\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.156\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.108\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.17.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/smc/smc_pnet.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/005a7173d8e4710646043a681af36f79ce05a29b\"}, {\"url\": \"https://git.kernel.org/stable/c/302dbed4760bcd19a661cc1c282d91bb7481307e\"}, {\"url\": \"https://git.kernel.org/stable/c/08aca586482e88aab9616a3e81bc36cad22674a5\"}, {\"url\": \"https://git.kernel.org/stable/c/233927b645cb7a14bb98d23ac72e4c7243a9f0d9\"}, {\"url\": \"https://git.kernel.org/stable/c/3d3466878afd8d43ec0ca2facfbc7f03e40d0f79\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmc: Fix use-after-free in __pnet_find_base_ndev().\\n\\nsyzbot reported use-after-free of net_device in __pnet_find_base_ndev(),\\nwhich was called during connect(). [0]\\n\\nsmc_pnet_find_ism_resource() fetches sk_dst_get(sk)-\u003edev and passes\\ndown to pnet_find_base_ndev(), where RTNL is held.  Then, UAF happened\\nat __pnet_find_base_ndev() when the dev is first used.\\n\\nThis means dev had already been freed before acquiring RTNL in\\npnet_find_base_ndev().\\n\\nWhile dev is going away, dst-\u003edev could be swapped with blackhole_netdev,\\nand the dev\u0027s refcnt by dst will be released.\\n\\nWe must hold dev\u0027s refcnt before calling smc_pnet_find_ism_resource().\\n\\nAlso, smc_pnet_find_roce_resource() has the same problem.\\n\\nLet\u0027s use __sk_dst_get() and dst_dev_rcu() in the two functions.\\n\\n[0]:\\nBUG: KASAN: use-after-free in __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926\\nRead of size 1 at addr ffff888036bac33a by task syz.0.3632/18609\\n\\nCPU: 1 UID: 0 PID: 18609 Comm: syz.0.3632 Not tainted syzkaller #0 PREEMPT(full)\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\\n print_address_description mm/kasan/report.c:378 [inline]\\n print_report+0xca/0x240 mm/kasan/report.c:482\\n kasan_report+0x118/0x150 mm/kasan/report.c:595\\n __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926\\n pnet_find_base_ndev net/smc/smc_pnet.c:946 [inline]\\n smc_pnet_find_ism_by_pnetid net/smc/smc_pnet.c:1103 [inline]\\n smc_pnet_find_ism_resource+0xef/0x390 net/smc/smc_pnet.c:1154\\n smc_find_ism_device net/smc/af_smc.c:1030 [inline]\\n smc_find_proposal_devices net/smc/af_smc.c:1115 [inline]\\n __smc_connect+0x372/0x1890 net/smc/af_smc.c:1545\\n smc_connect+0x877/0xd90 net/smc/af_smc.c:1715\\n __sys_connect_file net/socket.c:2086 [inline]\\n __sys_connect+0x313/0x440 net/socket.c:2105\\n __do_sys_connect net/socket.c:2111 [inline]\\n __se_sys_connect net/socket.c:2108 [inline]\\n __x64_sys_connect+0x7a/0x90 net/socket.c:2108\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nRIP: 0033:0x7f47cbf8eba9\\nCode: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48\\nRSP: 002b:00007f47ccdb1038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a\\nRAX: ffffffffffffffda RBX: 00007f47cc1d5fa0 RCX: 00007f47cbf8eba9\\nRDX: 0000000000000010 RSI: 0000200000000280 RDI: 000000000000000b\\nRBP: 00007f47cc011e19 R08: 0000000000000000 R09: 0000000000000000\\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\\nR13: 00007f47cc1d6038 R14: 00007f47cc1d5fa0 R15: 00007ffc512f8aa8\\n \u003c/TASK\u003e\\n\\nThe buggy address belongs to the physical page:\\npage: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888036bacd00 pfn:0x36bac\\nflags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)\\nraw: 00fff00000000000 ffffea0001243d08 ffff8880b863fdc0 0000000000000000\\nraw: ffff888036bacd00 0000000000000000 00000000ffffffff 0000000000000000\\npage dumped because: kasan: bad access detected\\npage_owner tracks the page as freed\\npage last allocated via order 2, migratetype Unmovable, gfp_mask 0x446dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP), pid 16741, tgid 16741 (syz-executor), ts 343313197788, free_ts 380670750466\\n set_page_owner include/linux/page_owner.h:32 [inline]\\n post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851\\n prep_new_page mm/page_alloc.c:1859 [inline]\\n get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858\\n __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148\\n alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416\\n ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:4317\\n __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:4348\\n __do_kmalloc_node mm/slub.c:4364 [inline]\\n __kvmalloc_node\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.187\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.156\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.108\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17.3\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18\", \"versionStartIncluding\": \"4.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-09-02T12:49:24.811Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-40064\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-02T12:49:24.811Z\", \"dateReserved\": \"2025-04-16T07:20:57.159Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-10-28T11:48:35.155Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.

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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.