CVE-2026-23032 (GCVE-0-2026-23032)

Vulnerability from cvelistv5 – Published: 2026-01-31 11:42 – Updated: 2026-02-09 08:37
VLAI?
Title
null_blk: fix kmemleak by releasing references to fault configfs items
Summary
In the Linux kernel, the following vulnerability has been resolved: null_blk: fix kmemleak by releasing references to fault configfs items When CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION is enabled, the null-blk driver sets up fault injection support by creating the timeout_inject, requeue_inject, and init_hctx_fault_inject configfs items as children of the top-level nullbX configfs group. However, when the nullbX device is removed, the references taken to these fault-config configfs items are not released. As a result, kmemleak reports a memory leak, for example: unreferenced object 0xc00000021ff25c40 (size 32): comm "mkdir", pid 10665, jiffies 4322121578 hex dump (first 32 bytes): 69 6e 69 74 5f 68 63 74 78 5f 66 61 75 6c 74 5f init_hctx_fault_ 69 6e 6a 65 63 74 00 88 00 00 00 00 00 00 00 00 inject.......... backtrace (crc 1a018c86): __kmalloc_node_track_caller_noprof+0x494/0xbd8 kvasprintf+0x74/0xf4 config_item_set_name+0xf0/0x104 config_group_init_type_name+0x48/0xfc fault_config_init+0x48/0xf0 0xc0080000180559e4 configfs_mkdir+0x304/0x814 vfs_mkdir+0x49c/0x604 do_mkdirat+0x314/0x3d0 sys_mkdir+0xa0/0xd8 system_call_exception+0x1b0/0x4f0 system_call_vectored_common+0x15c/0x2ec Fix this by explicitly releasing the references to the fault-config configfs items when dropping the reference to the top-level nullbX configfs group.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea , < 1a3286edf4d48ce37f8982ff3c3b65159a5ecbb2 (git)
Affected: bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea , < d59ba448ccd595d5d65e197216cf781a87db2b28 (git)
Affected: bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea , < f1718da051282698aa8fa150bebb9724f6389fda (git)
Affected: bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea , < 40b94ec7edbbb867c4e26a1a43d2b898f04b93c5 (git)
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    Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.67 , ≤ 6.12.* (semver)
Unaffected: 6.18.7 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/null_blk/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/null_blk/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.122",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.67",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.122",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.67",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.7",
                  "versionStartIncluding": "6.4",
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                {
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                  "versionEndExcluding": "6.19",
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: fix kmemleak by releasing references to fault configfs items\n\nWhen CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION is enabled, the null-blk\ndriver sets up fault injection support by creating the timeout_inject,\nrequeue_inject, and init_hctx_fault_inject configfs items as children\nof the top-level nullbX configfs group.\n\nHowever, when the nullbX device is removed, the references taken to\nthese fault-config configfs items are not released. As a result,\nkmemleak reports a memory leak, for example:\n\nunreferenced object 0xc00000021ff25c40 (size 32):\n  comm \"mkdir\", pid 10665, jiffies 4322121578\n  hex dump (first 32 bytes):\n    69 6e 69 74 5f 68 63 74 78 5f 66 61 75 6c 74 5f  init_hctx_fault_\n    69 6e 6a 65 63 74 00 88 00 00 00 00 00 00 00 00  inject..........\n  backtrace (crc 1a018c86):\n    __kmalloc_node_track_caller_noprof+0x494/0xbd8\n    kvasprintf+0x74/0xf4\n    config_item_set_name+0xf0/0x104\n    config_group_init_type_name+0x48/0xfc\n    fault_config_init+0x48/0xf0\n    0xc0080000180559e4\n    configfs_mkdir+0x304/0x814\n    vfs_mkdir+0x49c/0x604\n    do_mkdirat+0x314/0x3d0\n    sys_mkdir+0xa0/0xd8\n    system_call_exception+0x1b0/0x4f0\n    system_call_vectored_common+0x15c/0x2ec\n\nFix this by explicitly releasing the references to the fault-config\nconfigfs items when dropping the reference to the top-level nullbX\nconfigfs group."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:37:26.714Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1a3286edf4d48ce37f8982ff3c3b65159a5ecbb2"
        },
        {
          "url": "https://git.kernel.org/stable/c/d59ba448ccd595d5d65e197216cf781a87db2b28"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1718da051282698aa8fa150bebb9724f6389fda"
        },
        {
          "url": "https://git.kernel.org/stable/c/40b94ec7edbbb867c4e26a1a43d2b898f04b93c5"
        }
      ],
      "title": "null_blk: fix kmemleak by releasing references to fault configfs items",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23032",
    "datePublished": "2026-01-31T11:42:11.640Z",
    "dateReserved": "2026-01-13T15:37:45.942Z",
    "dateUpdated": "2026-02-09T08:37:26.714Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23032\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-31T12:16:06.513\",\"lastModified\":\"2026-02-03T16:44:36.630\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnull_blk: fix kmemleak by releasing references to fault configfs items\\n\\nWhen CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION is enabled, the null-blk\\ndriver sets up fault injection support by creating the timeout_inject,\\nrequeue_inject, and init_hctx_fault_inject configfs items as children\\nof the top-level nullbX configfs group.\\n\\nHowever, when the nullbX device is removed, the references taken to\\nthese fault-config configfs items are not released. As a result,\\nkmemleak reports a memory leak, for example:\\n\\nunreferenced object 0xc00000021ff25c40 (size 32):\\n  comm \\\"mkdir\\\", pid 10665, jiffies 4322121578\\n  hex dump (first 32 bytes):\\n    69 6e 69 74 5f 68 63 74 78 5f 66 61 75 6c 74 5f  init_hctx_fault_\\n    69 6e 6a 65 63 74 00 88 00 00 00 00 00 00 00 00  inject..........\\n  backtrace (crc 1a018c86):\\n    __kmalloc_node_track_caller_noprof+0x494/0xbd8\\n    kvasprintf+0x74/0xf4\\n    config_item_set_name+0xf0/0x104\\n    config_group_init_type_name+0x48/0xfc\\n    fault_config_init+0x48/0xf0\\n    0xc0080000180559e4\\n    configfs_mkdir+0x304/0x814\\n    vfs_mkdir+0x49c/0x604\\n    do_mkdirat+0x314/0x3d0\\n    sys_mkdir+0xa0/0xd8\\n    system_call_exception+0x1b0/0x4f0\\n    system_call_vectored_common+0x15c/0x2ec\\n\\nFix this by explicitly releasing the references to the fault-config\\nconfigfs items when dropping the reference to the top-level nullbX\\nconfigfs group.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1a3286edf4d48ce37f8982ff3c3b65159a5ecbb2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/40b94ec7edbbb867c4e26a1a43d2b898f04b93c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d59ba448ccd595d5d65e197216cf781a87db2b28\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1718da051282698aa8fa150bebb9724f6389fda\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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