CVE-2025-38211 (GCVE-0-2025-38211)

Vulnerability from cvelistv5 – Published: 2025-07-04 13:37 – Updated: 2025-11-03 17:35
VLAI?
Title
RDMA/iwcm: Fix use-after-free of work objects after cm_id destruction
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/iwcm: Fix use-after-free of work objects after cm_id destruction The commit 59c68ac31e15 ("iw_cm: free cm_id resources on the last deref") simplified cm_id resource management by freeing cm_id once all references to the cm_id were removed. The references are removed either upon completion of iw_cm event handlers or when the application destroys the cm_id. This commit introduced the use-after-free condition where cm_id_private object could still be in use by event handler works during the destruction of cm_id. The commit aee2424246f9 ("RDMA/iwcm: Fix a use-after-free related to destroying CM IDs") addressed this use-after- free by flushing all pending works at the cm_id destruction. However, still another use-after-free possibility remained. It happens with the work objects allocated for each cm_id_priv within alloc_work_entries() during cm_id creation, and subsequently freed in dealloc_work_entries() once all references to the cm_id are removed. If the cm_id's last reference is decremented in the event handler work, the work object for the work itself gets removed, and causes the use- after-free BUG below: BUG: KASAN: slab-use-after-free in __pwq_activate_work+0x1ff/0x250 Read of size 8 at addr ffff88811f9cf800 by task kworker/u16:1/147091 CPU: 2 UID: 0 PID: 147091 Comm: kworker/u16:1 Not tainted 6.15.0-rc2+ #27 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014 Workqueue: 0x0 (iw_cm_wq) Call Trace: <TASK> dump_stack_lvl+0x6a/0x90 print_report+0x174/0x554 ? __virt_addr_valid+0x208/0x430 ? __pwq_activate_work+0x1ff/0x250 kasan_report+0xae/0x170 ? __pwq_activate_work+0x1ff/0x250 __pwq_activate_work+0x1ff/0x250 pwq_dec_nr_in_flight+0x8c5/0xfb0 process_one_work+0xc11/0x1460 ? __pfx_process_one_work+0x10/0x10 ? assign_work+0x16c/0x240 worker_thread+0x5ef/0xfd0 ? __pfx_worker_thread+0x10/0x10 kthread+0x3b0/0x770 ? __pfx_kthread+0x10/0x10 ? rcu_is_watching+0x11/0xb0 ? _raw_spin_unlock_irq+0x24/0x50 ? rcu_is_watching+0x11/0xb0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x30/0x70 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> Allocated by task 147416: kasan_save_stack+0x2c/0x50 kasan_save_track+0x10/0x30 __kasan_kmalloc+0xa6/0xb0 alloc_work_entries+0xa9/0x260 [iw_cm] iw_cm_connect+0x23/0x4a0 [iw_cm] rdma_connect_locked+0xbfd/0x1920 [rdma_cm] nvme_rdma_cm_handler+0x8e5/0x1b60 [nvme_rdma] cma_cm_event_handler+0xae/0x320 [rdma_cm] cma_work_handler+0x106/0x1b0 [rdma_cm] process_one_work+0x84f/0x1460 worker_thread+0x5ef/0xfd0 kthread+0x3b0/0x770 ret_from_fork+0x30/0x70 ret_from_fork_asm+0x1a/0x30 Freed by task 147091: kasan_save_stack+0x2c/0x50 kasan_save_track+0x10/0x30 kasan_save_free_info+0x37/0x60 __kasan_slab_free+0x4b/0x70 kfree+0x13a/0x4b0 dealloc_work_entries+0x125/0x1f0 [iw_cm] iwcm_deref_id+0x6f/0xa0 [iw_cm] cm_work_handler+0x136/0x1ba0 [iw_cm] process_one_work+0x84f/0x1460 worker_thread+0x5ef/0xfd0 kthread+0x3b0/0x770 ret_from_fork+0x30/0x70 ret_from_fork_asm+0x1a/0x30 Last potentially related work creation: kasan_save_stack+0x2c/0x50 kasan_record_aux_stack+0xa3/0xb0 __queue_work+0x2ff/0x1390 queue_work_on+0x67/0xc0 cm_event_handler+0x46a/0x820 [iw_cm] siw_cm_upcall+0x330/0x650 [siw] siw_cm_work_handler+0x6b9/0x2b20 [siw] process_one_work+0x84f/0x1460 worker_thread+0x5ef/0xfd0 kthread+0x3b0/0x770 ret_from_fork+0x30/0x70 ret_from_fork_asm+0x1a/0x30 This BUG is reproducible by repeating the blktests test case nvme/061 for the rdma transport and the siw driver. To avoid the use-after-free of cm_id_private work objects, ensure that the last reference to the cm_id is decremented not in the event handler works, but in the cm_id destruction context. For that purpose, mo ---truncated---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 59c68ac31e15ad09d2cb04734e3c8c544a95f8d4 , < 013dcdf6f03bcedbaf1669e3db71c34a197715b2 (git)
Affected: 59c68ac31e15ad09d2cb04734e3c8c544a95f8d4 , < bf7eff5e3a36c54bbe8aff7fd6dd7c07490b81c5 (git)
Affected: 59c68ac31e15ad09d2cb04734e3c8c544a95f8d4 , < 3b4a50d733acad6831f6bd9288a76a80f70650ac (git)
Affected: 59c68ac31e15ad09d2cb04734e3c8c544a95f8d4 , < 78381dc8a6b61c9bb9987d37b4d671b99767c4a1 (git)
Affected: 59c68ac31e15ad09d2cb04734e3c8c544a95f8d4 , < 23a707bbcbea468eedb398832eeb7e8e0ceafd21 (git)
Affected: 59c68ac31e15ad09d2cb04734e3c8c544a95f8d4 , < 764c9f69beabef8bdc651a7746c59f7a340d104f (git)
Affected: 59c68ac31e15ad09d2cb04734e3c8c544a95f8d4 , < fd960b5ddf4faf00da43babdd3acda68842e1f6a (git)
Affected: 59c68ac31e15ad09d2cb04734e3c8c544a95f8d4 , < 6883b680e703c6b2efddb4e7a8d891ce1803d06b (git)
Create a notification for this product.
    Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.4.296 , ≤ 5.4.* (semver)
Unaffected: 5.10.240 , ≤ 5.10.* (semver)
Unaffected: 5.15.186 , ≤ 5.15.* (semver)
Unaffected: 6.1.142 , ≤ 6.1.* (semver)
Unaffected: 6.6.95 , ≤ 6.6.* (semver)
Unaffected: 6.12.35 , ≤ 6.12.* (semver)
Unaffected: 6.15.4 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          },
          {
            "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\nRDMA/iwcm: Fix use-after-free of work objects after cm_id destruction\n\nThe commit 59c68ac31e15 (\"iw_cm: free cm_id resources on the last\nderef\") simplified cm_id resource management by freeing cm_id once all\nreferences to the cm_id were removed. The references are removed either\nupon completion of iw_cm event handlers or when the application destroys\nthe cm_id. This commit introduced the use-after-free condition where\ncm_id_private object could still be in use by event handler works during\nthe destruction of cm_id. The commit aee2424246f9 (\"RDMA/iwcm: Fix a\nuse-after-free related to destroying CM IDs\") addressed this use-after-\nfree by flushing all pending works at the cm_id destruction.\n\nHowever, still another use-after-free possibility remained. It happens\nwith the work objects allocated for each cm_id_priv within\nalloc_work_entries() during cm_id creation, and subsequently freed in\ndealloc_work_entries() once all references to the cm_id are removed.\nIf the cm_id\u0027s last reference is decremented in the event handler work,\nthe work object for the work itself gets removed, and causes the use-\nafter-free BUG below:\n\n  BUG: KASAN: slab-use-after-free in __pwq_activate_work+0x1ff/0x250\n  Read of size 8 at addr ffff88811f9cf800 by task kworker/u16:1/147091\n\n  CPU: 2 UID: 0 PID: 147091 Comm: kworker/u16:1 Not tainted 6.15.0-rc2+ #27 PREEMPT(voluntary)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014\n  Workqueue:  0x0 (iw_cm_wq)\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x6a/0x90\n   print_report+0x174/0x554\n   ? __virt_addr_valid+0x208/0x430\n   ? __pwq_activate_work+0x1ff/0x250\n   kasan_report+0xae/0x170\n   ? __pwq_activate_work+0x1ff/0x250\n   __pwq_activate_work+0x1ff/0x250\n   pwq_dec_nr_in_flight+0x8c5/0xfb0\n   process_one_work+0xc11/0x1460\n   ? __pfx_process_one_work+0x10/0x10\n   ? assign_work+0x16c/0x240\n   worker_thread+0x5ef/0xfd0\n   ? __pfx_worker_thread+0x10/0x10\n   kthread+0x3b0/0x770\n   ? __pfx_kthread+0x10/0x10\n   ? rcu_is_watching+0x11/0xb0\n   ? _raw_spin_unlock_irq+0x24/0x50\n   ? rcu_is_watching+0x11/0xb0\n   ? __pfx_kthread+0x10/0x10\n   ret_from_fork+0x30/0x70\n   ? __pfx_kthread+0x10/0x10\n   ret_from_fork_asm+0x1a/0x30\n   \u003c/TASK\u003e\n\n  Allocated by task 147416:\n   kasan_save_stack+0x2c/0x50\n   kasan_save_track+0x10/0x30\n   __kasan_kmalloc+0xa6/0xb0\n   alloc_work_entries+0xa9/0x260 [iw_cm]\n   iw_cm_connect+0x23/0x4a0 [iw_cm]\n   rdma_connect_locked+0xbfd/0x1920 [rdma_cm]\n   nvme_rdma_cm_handler+0x8e5/0x1b60 [nvme_rdma]\n   cma_cm_event_handler+0xae/0x320 [rdma_cm]\n   cma_work_handler+0x106/0x1b0 [rdma_cm]\n   process_one_work+0x84f/0x1460\n   worker_thread+0x5ef/0xfd0\n   kthread+0x3b0/0x770\n   ret_from_fork+0x30/0x70\n   ret_from_fork_asm+0x1a/0x30\n\n  Freed by task 147091:\n   kasan_save_stack+0x2c/0x50\n   kasan_save_track+0x10/0x30\n   kasan_save_free_info+0x37/0x60\n   __kasan_slab_free+0x4b/0x70\n   kfree+0x13a/0x4b0\n   dealloc_work_entries+0x125/0x1f0 [iw_cm]\n   iwcm_deref_id+0x6f/0xa0 [iw_cm]\n   cm_work_handler+0x136/0x1ba0 [iw_cm]\n   process_one_work+0x84f/0x1460\n   worker_thread+0x5ef/0xfd0\n   kthread+0x3b0/0x770\n   ret_from_fork+0x30/0x70\n   ret_from_fork_asm+0x1a/0x30\n\n  Last potentially related work creation:\n   kasan_save_stack+0x2c/0x50\n   kasan_record_aux_stack+0xa3/0xb0\n   __queue_work+0x2ff/0x1390\n   queue_work_on+0x67/0xc0\n   cm_event_handler+0x46a/0x820 [iw_cm]\n   siw_cm_upcall+0x330/0x650 [siw]\n   siw_cm_work_handler+0x6b9/0x2b20 [siw]\n   process_one_work+0x84f/0x1460\n   worker_thread+0x5ef/0xfd0\n   kthread+0x3b0/0x770\n   ret_from_fork+0x30/0x70\n   ret_from_fork_asm+0x1a/0x30\n\nThis BUG is reproducible by repeating the blktests test case nvme/061\nfor the rdma transport and the siw driver.\n\nTo avoid the use-after-free of cm_id_private work objects, ensure that\nthe last reference to the cm_id is decremented not in the event handler\nworks, but in the cm_id destruction context. For that purpose, mo\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:15:17.347Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/013dcdf6f03bcedbaf1669e3db71c34a197715b2"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf7eff5e3a36c54bbe8aff7fd6dd7c07490b81c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b4a50d733acad6831f6bd9288a76a80f70650ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/78381dc8a6b61c9bb9987d37b4d671b99767c4a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/23a707bbcbea468eedb398832eeb7e8e0ceafd21"
        },
        {
          "url": "https://git.kernel.org/stable/c/764c9f69beabef8bdc651a7746c59f7a340d104f"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd960b5ddf4faf00da43babdd3acda68842e1f6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/6883b680e703c6b2efddb4e7a8d891ce1803d06b"
        }
      ],
      "title": "RDMA/iwcm: Fix use-after-free of work objects after cm_id destruction",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38211",
    "datePublished": "2025-07-04T13:37:30.307Z",
    "dateReserved": "2025-04-16T04:51:23.994Z",
    "dateUpdated": "2025-11-03T17:35:29.579Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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  • 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.
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  • 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.



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