CVE-2022-49901 (GCVE-0-2022-49901)
Vulnerability from cvelistv5
Published
2025-05-01 14:10
Modified
2026-05-11 19:08
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: blk-mq: Fix kmemleak in blk_mq_init_allocated_queue There is a kmemleak caused by modprobe null_blk.ko unreferenced object 0xffff8881acb1f000 (size 1024): comm "modprobe", pid 836, jiffies 4294971190 (age 27.068s) hex dump (first 32 bytes): 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... ff ff ff ff ff ff ff ff 00 53 99 9e ff ff ff ff .........S...... backtrace: [<000000004a10c249>] kmalloc_node_trace+0x22/0x60 [<00000000648f7950>] blk_mq_alloc_and_init_hctx+0x289/0x350 [<00000000af06de0e>] blk_mq_realloc_hw_ctxs+0x2fe/0x3d0 [<00000000e00c1872>] blk_mq_init_allocated_queue+0x48c/0x1440 [<00000000d16b4e68>] __blk_mq_alloc_disk+0xc8/0x1c0 [<00000000d10c98c3>] 0xffffffffc450d69d [<00000000b9299f48>] 0xffffffffc4538392 [<0000000061c39ed6>] do_one_initcall+0xd0/0x4f0 [<00000000b389383b>] do_init_module+0x1a4/0x680 [<0000000087cf3542>] load_module+0x6249/0x7110 [<00000000beba61b8>] __do_sys_finit_module+0x140/0x200 [<00000000fdcfff51>] do_syscall_64+0x35/0x80 [<000000003c0f1f71>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 That is because q->ma_ops is set to NULL before blk_release_queue is called. blk_mq_init_queue_data blk_mq_init_allocated_queue blk_mq_realloc_hw_ctxs for (i = 0; i < set->nr_hw_queues; i++) { old_hctx = xa_load(&q->hctx_table, i); if (!blk_mq_alloc_and_init_hctx(.., i, ..)) [1] if (!old_hctx) break; xa_for_each_start(&q->hctx_table, j, hctx, j) blk_mq_exit_hctx(q, set, hctx, j); [2] if (!q->nr_hw_queues) [3] goto err_hctxs; err_exit: q->mq_ops = NULL; [4] blk_put_queue blk_release_queue if (queue_is_mq(q)) [5] blk_mq_release(q); [1]: blk_mq_alloc_and_init_hctx failed at i != 0. [2]: The hctxs allocated by [1] are moved to q->unused_hctx_list and will be cleaned up in blk_mq_release. [3]: q->nr_hw_queues is 0. [4]: Set q->mq_ops to NULL. [5]: queue_is_mq returns false due to [4]. And blk_mq_release will not be called. The hctxs in q->unused_hctx_list are leaked. To fix it, call blk_release_queue in exception path.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2f8f1336a48bd5186de3476da0a3e2ec06d0533a
Version: 2f8f1336a48bd5186de3476da0a3e2ec06d0533a
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2022-49901",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T14:59:17.778258Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-401",
                "description": "CWE-401 Missing Release of Memory after Effective Lifetime",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T20:16:35.594Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/blk-mq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2dc97e15a54b7bdf457848aa8c663c98a24e58a6",
              "status": "affected",
              "version": "2f8f1336a48bd5186de3476da0a3e2ec06d0533a",
              "versionType": "git"
            },
            {
              "lessThan": "943f45b9399ed8b2b5190cbc797995edaa97f58f",
              "status": "affected",
              "version": "2f8f1336a48bd5186de3476da0a3e2ec06d0533a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "block/blk-mq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.2"
            },
            {
              "lessThan": "5.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.8",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-mq: Fix kmemleak in blk_mq_init_allocated_queue\n\nThere is a kmemleak caused by modprobe null_blk.ko\n\nunreferenced object 0xffff8881acb1f000 (size 1024):\n  comm \"modprobe\", pid 836, jiffies 4294971190 (age 27.068s)\n  hex dump (first 32 bytes):\n    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........\n    ff ff ff ff ff ff ff ff 00 53 99 9e ff ff ff ff  .........S......\n  backtrace:\n    [\u003c000000004a10c249\u003e] kmalloc_node_trace+0x22/0x60\n    [\u003c00000000648f7950\u003e] blk_mq_alloc_and_init_hctx+0x289/0x350\n    [\u003c00000000af06de0e\u003e] blk_mq_realloc_hw_ctxs+0x2fe/0x3d0\n    [\u003c00000000e00c1872\u003e] blk_mq_init_allocated_queue+0x48c/0x1440\n    [\u003c00000000d16b4e68\u003e] __blk_mq_alloc_disk+0xc8/0x1c0\n    [\u003c00000000d10c98c3\u003e] 0xffffffffc450d69d\n    [\u003c00000000b9299f48\u003e] 0xffffffffc4538392\n    [\u003c0000000061c39ed6\u003e] do_one_initcall+0xd0/0x4f0\n    [\u003c00000000b389383b\u003e] do_init_module+0x1a4/0x680\n    [\u003c0000000087cf3542\u003e] load_module+0x6249/0x7110\n    [\u003c00000000beba61b8\u003e] __do_sys_finit_module+0x140/0x200\n    [\u003c00000000fdcfff51\u003e] do_syscall_64+0x35/0x80\n    [\u003c000000003c0f1f71\u003e] entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThat is because q-\u003ema_ops is set to NULL before blk_release_queue is\ncalled.\n\nblk_mq_init_queue_data\n  blk_mq_init_allocated_queue\n    blk_mq_realloc_hw_ctxs\n      for (i = 0; i \u003c set-\u003enr_hw_queues; i++) {\n        old_hctx = xa_load(\u0026q-\u003ehctx_table, i);\n        if (!blk_mq_alloc_and_init_hctx(.., i, ..))\t\t[1]\n          if (!old_hctx)\n\t    break;\n\n      xa_for_each_start(\u0026q-\u003ehctx_table, j, hctx, j)\n        blk_mq_exit_hctx(q, set, hctx, j); \t\t\t[2]\n\n    if (!q-\u003enr_hw_queues)\t\t\t\t\t[3]\n      goto err_hctxs;\n\n  err_exit:\n      q-\u003emq_ops = NULL;\t\t\t  \t\t\t[4]\n\n  blk_put_queue\n    blk_release_queue\n      if (queue_is_mq(q))\t\t\t\t\t[5]\n        blk_mq_release(q);\n\n[1]: blk_mq_alloc_and_init_hctx failed at i != 0.\n[2]: The hctxs allocated by [1] are moved to q-\u003eunused_hctx_list and\nwill be cleaned up in blk_mq_release.\n[3]: q-\u003enr_hw_queues is 0.\n[4]: Set q-\u003emq_ops to NULL.\n[5]: queue_is_mq returns false due to [4]. And blk_mq_release\nwill not be called. The hctxs in q-\u003eunused_hctx_list are leaked.\n\nTo fix it, call blk_release_queue in exception path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:08:54.911Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2dc97e15a54b7bdf457848aa8c663c98a24e58a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/943f45b9399ed8b2b5190cbc797995edaa97f58f"
        }
      ],
      "title": "blk-mq: Fix kmemleak in blk_mq_init_allocated_queue",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49901",
    "datePublished": "2025-05-01T14:10:46.974Z",
    "dateReserved": "2025-05-01T14:05:17.245Z",
    "dateUpdated": "2026-05-11T19:08:54.911Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.