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

Vulnerability from cvelistv5 – Published: 2025-10-28 11:48 – Updated: 2026-05-11 21:41
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
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0afff91c6f5ecef27715ea71e34dc2baacba1060 , < 233927b645cb7a14bb98d23ac72e4c7243a9f0d9 (git)
Affected: 0afff91c6f5ecef27715ea71e34dc2baacba1060 , < 3d3466878afd8d43ec0ca2facfbc7f03e40d0f79 (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_pnet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "233927b645cb7a14bb98d23ac72e4c7243a9f0d9",
              "status": "affected",
              "version": "0afff91c6f5ecef27715ea71e34dc2baacba1060",
              "versionType": "git"
            },
            {
              "lessThan": "3d3466878afd8d43ec0ca2facfbc7f03e40d0f79",
              "status": "affected",
              "version": "0afff91c6f5ecef27715ea71e34dc2baacba1060",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_pnet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.3",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:41:47.014Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2026-05-11T21:41:47.014Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40064",
      "date": "2026-06-05",
      "epss": "0.00027",
      "percentile": "0.08092"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40064\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-28T12:15:40.840\",\"lastModified\":\"2025-10-30T15:05:32.197\",\"vulnStatus\":\"Awaiting Analysis\",\"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---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/233927b645cb7a14bb98d23ac72e4c7243a9f0d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3d3466878afd8d43ec0ca2facfbc7f03e40d0f79\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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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

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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.