CVE-2025-21886

{
  "id": "CVE-2025-21886",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7cc8f681f6d4ae4478ae0f60485fc768f2b450da",
              "lessThan": "cb96ae783e7249e8e5a50c22952c0bb2983133df",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "edfb65dbb9ffd3102f3ff4dd21316158e56f1976",
              "lessThan": "a095ede2daca49d15e74d66d014883f2fa8bb924",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d3d930411ce390e532470194296658a960887773",
              "lessThan": "3d8c6f26893d55fab218ad086719de1fc9bb86ba",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/infiniband/hw/mlx5/odp.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12.13",
              "lessThan": "6.12.18",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.13.2",
              "lessThan": "6.13.6",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/infiniband/hw/mlx5/odp.c"
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2025-03-27T15:15:56.510",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3d8c6f26893d55fab218ad086719de1fc9bb86ba",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a095ede2daca49d15e74d66d014883f2fa8bb924",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cb96ae783e7249e8e5a50c22952c0bb2983133df",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix implicit ODP hang on parent deregistration\n\nFix the destroy_unused_implicit_child_mr() to prevent hanging during\nparent deregistration as of below [1].\n\nUpon entering destroy_unused_implicit_child_mr(), the reference count\nfor the implicit MR parent is incremented using:\nrefcount_inc_not_zero().\n\nA corresponding decrement must be performed if\nfree_implicit_child_mr_work() is not called.\n\nThe code has been updated to properly manage the reference count that\nwas incremented.\n\n[1]\nINFO: task python3:2157 blocked for more than 120 seconds.\nNot tainted 6.12.0-rc7+ #1633\n\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:python3         state:D stack:0     pid:2157 tgid:2157  ppid:1685   flags:0x00000000\nCall Trace:\n<TASK>\n__schedule+0x420/0xd30\nschedule+0x47/0x130\n__mlx5_ib_dereg_mr+0x379/0x5d0 [mlx5_ib]\n? __pfx_autoremove_wake_function+0x10/0x10\nib_dereg_mr_user+0x5f/0x120 [ib_core]\n? lock_release+0xc6/0x280\ndestroy_hw_idr_uobject+0x1d/0x60 [ib_uverbs]\nuverbs_destroy_uobject+0x58/0x1d0 [ib_uverbs]\nuobj_destroy+0x3f/0x70 [ib_uverbs]\nib_uverbs_cmd_verbs+0x3e4/0xbb0 [ib_uverbs]\n? __pfx_uverbs_destroy_def_handler+0x10/0x10 [ib_uverbs]\n? lock_acquire+0xc1/0x2f0\n? ib_uverbs_ioctl+0xcb/0x170 [ib_uverbs]\n? ib_uverbs_ioctl+0x116/0x170 [ib_uverbs]\n? lock_release+0xc6/0x280\nib_uverbs_ioctl+0xe7/0x170 [ib_uverbs]\n? ib_uverbs_ioctl+0xcb/0x170 [ib_uverbs]\n __x64_sys_ioctl+0x1b0/0xa70\n? kmem_cache_free+0x221/0x400\ndo_syscall_64+0x6b/0x140\nentry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0033:0x7f20f21f017b\nRSP: 002b:00007ffcfc4a77c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 00007ffcfc4a78d8 RCX: 00007f20f21f017b\nRDX: 00007ffcfc4a78c0 RSI: 00000000c0181b01 RDI: 0000000000000003\nRBP: 00007ffcfc4a78a0 R08: 000056147d125190 R09: 00007f20f1f14c60\nR10: 0000000000000001 R11: 0000000000000246 R12: 00007ffcfc4a7890\nR13: 000000000000001c R14: 000056147d100fc0 R15: 00007f20e365c9d0\n</TASK>"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: RDMA/mlx5: Se ha corregido el bloqueo implícito de ODP al cancelar el registro del padre. Se ha corregido la función destroy_unused_implicit_child_mr() para evitar que se bloquee durante la cancelación del registro del padre, como se indica a continuación [1]. Al ejecutar destroy_unused_implicit_child_mr(), el contador de referencias del padre MR implícito se incrementa mediante refcount_inc_not_zero(). Se debe realizar la decrementación correspondiente si no se llama a free_implicit_child_mr_work(). El código se ha actualizado para gestionar correctamente el contador de referencias que se incrementó. [1] INFORMACIÓN: La tarea python3:2157 se bloqueó durante más de 120 segundos. No contaminada. 6.12.0-rc7+ #1633 \"echo 0 &gt; /proc/sys/kernel/hung_task_timeout_secs\" disables this message. task:python3 state:D stack:0 pid:2157 tgid:2157 ppid:1685 flags:0x00000000 Call Trace:  __schedule+0x420/0xd30 schedule+0x47/0x130 __mlx5_ib_dereg_mr+0x379/0x5d0 [mlx5_ib] ? __pfx_autoremove_wake_function+0x10/0x10 ib_dereg_mr_user+0x5f/0x120 [ib_core] ? lock_release+0xc6/0x280 destroy_hw_idr_uobject+0x1d/0x60 [ib_uverbs] uverbs_destroy_uobject+0x58/0x1d0 [ib_uverbs] uobj_destroy+0x3f/0x70 [ib_uverbs] ib_uverbs_cmd_verbs+0x3e4/0xbb0 [ib_uverbs] ? __pfx_uverbs_destroy_def_handler+0x10/0x10 [ib_uverbs] ? lock_acquire+0xc1/0x2f0 ? ib_uverbs_ioctl+0xcb/0x170 [ib_uverbs] ? ib_uverbs_ioctl+0x116/0x170 [ib_uverbs] ? lock_release+0xc6/0x280 ib_uverbs_ioctl+0xe7/0x170 [ib_uverbs] ? ib_uverbs_ioctl+0xcb/0x170 [ib_uverbs] __x64_sys_ioctl+0x1b0/0xa70 ? kmem_cache_free+0x221/0x400 do_syscall_64+0x6b/0x140 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f20f21f017b RSP: 002b:00007ffcfc4a77c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffcfc4a78d8 RCX: 00007f20f21f017b RDX: 00007ffcfc4a78c0 RSI: 00000000c0181b01 RDI: 0000000000000003 RBP: 00007ffcfc4a78a0 R08: 000056147d125190 R09: 00007f20f1f14c60 R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffcfc4a7890 R13: 000000000000001c R14: 000056147d100fc0 R15: 00007f20e365c9d0  "
    }
  ],
  "lastModified": "2026-06-17T08:44:31.860",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "6.12.18",
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              "versionEndExcluding": "6.13.6",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}