CVE-2025-40257 (GCVE-0-2025-40257)

Vulnerability from cvelistv5 – Published: 2025-12-04 16:08 – Updated: 2026-06-02 13:00
VLAI
Title
mptcp: fix a race in mptcp_pm_del_add_timer()
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix a race in mptcp_pm_del_add_timer() mptcp_pm_del_add_timer() can call sk_stop_timer_sync(sk, &entry->add_timer) while another might have free entry already, as reported by syzbot. Add RCU protection to fix this issue. Also change confusing add_timer variable with stop_timer boolean. syzbot report: BUG: KASAN: slab-use-after-free in __timer_delete_sync+0x372/0x3f0 kernel/time/timer.c:1616 Read of size 4 at addr ffff8880311e4150 by task kworker/1:1/44 CPU: 1 UID: 0 PID: 44 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: events mptcp_worker 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 __timer_delete_sync+0x372/0x3f0 kernel/time/timer.c:1616 sk_stop_timer_sync+0x1b/0x90 net/core/sock.c:3631 mptcp_pm_del_add_timer+0x283/0x310 net/mptcp/pm.c:362 mptcp_incoming_options+0x1357/0x1f60 net/mptcp/options.c:1174 tcp_data_queue+0xca/0x6450 net/ipv4/tcp_input.c:5361 tcp_rcv_established+0x1335/0x2670 net/ipv4/tcp_input.c:6441 tcp_v4_do_rcv+0x98b/0xbf0 net/ipv4/tcp_ipv4.c:1931 tcp_v4_rcv+0x252a/0x2dc0 net/ipv4/tcp_ipv4.c:2374 ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:239 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6079 [inline] __netif_receive_skb+0x143/0x380 net/core/dev.c:6192 process_backlog+0x31e/0x900 net/core/dev.c:6544 __napi_poll+0xb6/0x540 net/core/dev.c:7594 napi_poll net/core/dev.c:7657 [inline] net_rx_action+0x5f7/0xda0 net/core/dev.c:7784 handle_softirqs+0x22f/0x710 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] __local_bh_enable_ip+0x1a0/0x2e0 kernel/softirq.c:302 mptcp_pm_send_ack net/mptcp/pm.c:210 [inline] mptcp_pm_addr_send_ack+0x41f/0x500 net/mptcp/pm.c:-1 mptcp_pm_worker+0x174/0x320 net/mptcp/pm.c:1002 mptcp_worker+0xd5/0x1170 net/mptcp/protocol.c:2762 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Allocated by task 44: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_noprof+0x1ef/0x6c0 mm/slub.c:5748 kmalloc_noprof include/linux/slab.h:957 [inline] mptcp_pm_alloc_anno_list+0x104/0x460 net/mptcp/pm.c:385 mptcp_pm_create_subflow_or_signal_addr+0xf9d/0x1360 net/mptcp/pm_kernel.c:355 mptcp_pm_nl_fully_established net/mptcp/pm_kernel.c:409 [inline] __mptcp_pm_kernel_worker+0x417/0x1ef0 net/mptcp/pm_kernel.c:1529 mptcp_pm_worker+0x1ee/0x320 net/mptcp/pm.c:1008 mptcp_worker+0xd5/0x1170 net/mptcp/protocol.c:2762 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 6630: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object m ---truncated---
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < 9be29f8e7ce4e147e56caac2c3a0ce3573cf9c17 (git)
Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < e2d1ad207174a7cd7903dd27a00db4b2dfa6c64b (git)
Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < 385ddc0f008f24d1e7d03be998b3a98a37bd29ff (git)
Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < c602cc344b4b8d41515fec3ffa98457ac963ee12 (git)
Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < 6d3275d4ca62e2c02e1b7e8cd32db59df91c14b7 (git)
Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < bbbd75346c8e6490b19c2ba90f38ea66ccf352b2 (git)
Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < 426358d9be7ce3518966422f87b96f1bad27295f (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.118 , ≤ 6.6.* (semver)
Unaffected: 6.12.60 , ≤ 6.12.* (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V4.0 (custom)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix a race in mptcp_pm_del_add_timer()\n\nmptcp_pm_del_add_timer() can call sk_stop_timer_sync(sk, \u0026entry-\u003eadd_timer)\nwhile another might have free entry already, as reported by syzbot.\n\nAdd RCU protection to fix this issue.\n\nAlso change confusing add_timer variable with stop_timer boolean.\n\nsyzbot report:\n\nBUG: KASAN: slab-use-after-free in __timer_delete_sync+0x372/0x3f0 kernel/time/timer.c:1616\nRead of size 4 at addr ffff8880311e4150 by task kworker/1:1/44\n\nCPU: 1 UID: 0 PID: 44 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)}\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025\nWorkqueue: events mptcp_worker\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  __timer_delete_sync+0x372/0x3f0 kernel/time/timer.c:1616\n  sk_stop_timer_sync+0x1b/0x90 net/core/sock.c:3631\n  mptcp_pm_del_add_timer+0x283/0x310 net/mptcp/pm.c:362\n  mptcp_incoming_options+0x1357/0x1f60 net/mptcp/options.c:1174\n  tcp_data_queue+0xca/0x6450 net/ipv4/tcp_input.c:5361\n  tcp_rcv_established+0x1335/0x2670 net/ipv4/tcp_input.c:6441\n  tcp_v4_do_rcv+0x98b/0xbf0 net/ipv4/tcp_ipv4.c:1931\n  tcp_v4_rcv+0x252a/0x2dc0 net/ipv4/tcp_ipv4.c:2374\n  ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:205\n  ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:239\n  NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318\n  NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318\n  __netif_receive_skb_one_core net/core/dev.c:6079 [inline]\n  __netif_receive_skb+0x143/0x380 net/core/dev.c:6192\n  process_backlog+0x31e/0x900 net/core/dev.c:6544\n  __napi_poll+0xb6/0x540 net/core/dev.c:7594\n  napi_poll net/core/dev.c:7657 [inline]\n  net_rx_action+0x5f7/0xda0 net/core/dev.c:7784\n  handle_softirqs+0x22f/0x710 kernel/softirq.c:622\n  __do_softirq kernel/softirq.c:656 [inline]\n  __local_bh_enable_ip+0x1a0/0x2e0 kernel/softirq.c:302\n  mptcp_pm_send_ack net/mptcp/pm.c:210 [inline]\n mptcp_pm_addr_send_ack+0x41f/0x500 net/mptcp/pm.c:-1\n  mptcp_pm_worker+0x174/0x320 net/mptcp/pm.c:1002\n  mptcp_worker+0xd5/0x1170 net/mptcp/protocol.c:2762\n  process_one_work kernel/workqueue.c:3263 [inline]\n  process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346\n  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427\n  kthread+0x711/0x8a0 kernel/kthread.c:463\n  ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\nAllocated by task 44:\n  kasan_save_stack mm/kasan/common.c:56 [inline]\n  kasan_save_track+0x3e/0x80 mm/kasan/common.c:77\n  poison_kmalloc_redzone mm/kasan/common.c:400 [inline]\n  __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417\n  kasan_kmalloc include/linux/kasan.h:262 [inline]\n  __kmalloc_cache_noprof+0x1ef/0x6c0 mm/slub.c:5748\n  kmalloc_noprof include/linux/slab.h:957 [inline]\n  mptcp_pm_alloc_anno_list+0x104/0x460 net/mptcp/pm.c:385\n  mptcp_pm_create_subflow_or_signal_addr+0xf9d/0x1360 net/mptcp/pm_kernel.c:355\n  mptcp_pm_nl_fully_established net/mptcp/pm_kernel.c:409 [inline]\n  __mptcp_pm_kernel_worker+0x417/0x1ef0 net/mptcp/pm_kernel.c:1529\n  mptcp_pm_worker+0x1ee/0x320 net/mptcp/pm.c:1008\n  mptcp_worker+0xd5/0x1170 net/mptcp/protocol.c:2762\n  process_one_work kernel/workqueue.c:3263 [inline]\n  process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346\n  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427\n  kthread+0x711/0x8a0 kernel/kthread.c:463\n  ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n\nFreed by task 6630:\n  kasan_save_stack mm/kasan/common.c:56 [inline]\n  kasan_save_track+0x3e/0x80 mm/kasan/common.c:77\n  __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587\n  kasan_save_free_info mm/kasan/kasan.h:406 [inline]\n  poison_slab_object m\n---truncated---"
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:45:50.143Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/9be29f8e7ce4e147e56caac2c3a0ce3573cf9c17"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2d1ad207174a7cd7903dd27a00db4b2dfa6c64b"
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          "url": "https://git.kernel.org/stable/c/385ddc0f008f24d1e7d03be998b3a98a37bd29ff"
        },
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          "url": "https://git.kernel.org/stable/c/c602cc344b4b8d41515fec3ffa98457ac963ee12"
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        {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40257",
    "datePublished": "2025-12-04T16:08:18.433Z",
    "dateReserved": "2025-04-16T07:20:57.182Z",
    "dateUpdated": "2026-06-02T13:00:10.342Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40257",
      "date": "2026-06-09",
      "epss": "0.00045",
      "percentile": "0.14032"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40257\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-04T16:16:19.503\",\"lastModified\":\"2026-06-02T14:16:32.207\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmptcp: fix a race in mptcp_pm_del_add_timer()\\n\\nmptcp_pm_del_add_timer() can call sk_stop_timer_sync(sk, \u0026entry-\u003eadd_timer)\\nwhile another might have free entry already, as reported by syzbot.\\n\\nAdd RCU protection to fix this issue.\\n\\nAlso change confusing add_timer variable with stop_timer boolean.\\n\\nsyzbot report:\\n\\nBUG: KASAN: slab-use-after-free in __timer_delete_sync+0x372/0x3f0 kernel/time/timer.c:1616\\nRead of size 4 at addr ffff8880311e4150 by task kworker/1:1/44\\n\\nCPU: 1 UID: 0 PID: 44 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)}\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025\\nWorkqueue: events mptcp_worker\\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  __timer_delete_sync+0x372/0x3f0 kernel/time/timer.c:1616\\n  sk_stop_timer_sync+0x1b/0x90 net/core/sock.c:3631\\n  mptcp_pm_del_add_timer+0x283/0x310 net/mptcp/pm.c:362\\n  mptcp_incoming_options+0x1357/0x1f60 net/mptcp/options.c:1174\\n  tcp_data_queue+0xca/0x6450 net/ipv4/tcp_input.c:5361\\n  tcp_rcv_established+0x1335/0x2670 net/ipv4/tcp_input.c:6441\\n  tcp_v4_do_rcv+0x98b/0xbf0 net/ipv4/tcp_ipv4.c:1931\\n  tcp_v4_rcv+0x252a/0x2dc0 net/ipv4/tcp_ipv4.c:2374\\n  ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:205\\n  ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:239\\n  NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318\\n  NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318\\n  __netif_receive_skb_one_core net/core/dev.c:6079 [inline]\\n  __netif_receive_skb+0x143/0x380 net/core/dev.c:6192\\n  process_backlog+0x31e/0x900 net/core/dev.c:6544\\n  __napi_poll+0xb6/0x540 net/core/dev.c:7594\\n  napi_poll net/core/dev.c:7657 [inline]\\n  net_rx_action+0x5f7/0xda0 net/core/dev.c:7784\\n  handle_softirqs+0x22f/0x710 kernel/softirq.c:622\\n  __do_softirq kernel/softirq.c:656 [inline]\\n  __local_bh_enable_ip+0x1a0/0x2e0 kernel/softirq.c:302\\n  mptcp_pm_send_ack net/mptcp/pm.c:210 [inline]\\n mptcp_pm_addr_send_ack+0x41f/0x500 net/mptcp/pm.c:-1\\n  mptcp_pm_worker+0x174/0x320 net/mptcp/pm.c:1002\\n  mptcp_worker+0xd5/0x1170 net/mptcp/protocol.c:2762\\n  process_one_work kernel/workqueue.c:3263 [inline]\\n  process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346\\n  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427\\n  kthread+0x711/0x8a0 kernel/kthread.c:463\\n  ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158\\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\\n \u003c/TASK\u003e\\n\\nAllocated by task 44:\\n  kasan_save_stack mm/kasan/common.c:56 [inline]\\n  kasan_save_track+0x3e/0x80 mm/kasan/common.c:77\\n  poison_kmalloc_redzone mm/kasan/common.c:400 [inline]\\n  __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417\\n  kasan_kmalloc include/linux/kasan.h:262 [inline]\\n  __kmalloc_cache_noprof+0x1ef/0x6c0 mm/slub.c:5748\\n  kmalloc_noprof include/linux/slab.h:957 [inline]\\n  mptcp_pm_alloc_anno_list+0x104/0x460 net/mptcp/pm.c:385\\n  mptcp_pm_create_subflow_or_signal_addr+0xf9d/0x1360 net/mptcp/pm_kernel.c:355\\n  mptcp_pm_nl_fully_established net/mptcp/pm_kernel.c:409 [inline]\\n  __mptcp_pm_kernel_worker+0x417/0x1ef0 net/mptcp/pm_kernel.c:1529\\n  mptcp_pm_worker+0x1ee/0x320 net/mptcp/pm.c:1008\\n  mptcp_worker+0xd5/0x1170 net/mptcp/protocol.c:2762\\n  process_one_work kernel/workqueue.c:3263 [inline]\\n  process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346\\n  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427\\n  kthread+0x711/0x8a0 kernel/kthread.c:463\\n  ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158\\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\\n\\nFreed by task 6630:\\n  kasan_save_stack mm/kasan/common.c:56 [inline]\\n  kasan_save_track+0x3e/0x80 mm/kasan/common.c:77\\n  __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587\\n  kasan_save_free_info mm/kasan/kasan.h:406 [inline]\\n  poison_slab_object m\\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/385ddc0f008f24d1e7d03be998b3a98a37bd29ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/426358d9be7ce3518966422f87b96f1bad27295f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6d3275d4ca62e2c02e1b7e8cd32db59df91c14b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9be29f8e7ce4e147e56caac2c3a0ce3573cf9c17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bbbd75346c8e6490b19c2ba90f38ea66ccf352b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c602cc344b4b8d41515fec3ffa98457ac963ee12\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2d1ad207174a7cd7903dd27a00db4b2dfa6c64b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-253495.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}"
  }
}


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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.