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

Vulnerability from cvelistv5 – Published: 2026-01-31 11:42 – Updated: 2026-06-02 13:00
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 CPE status
Linux Linux Affected: bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea , < 1a3286edf4d48ce37f8982ff3c3b65159a5ecbb2 (git)
Affected: bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea , < d59ba448ccd595d5d65e197216cf781a87db2b28 (git)
Affected: bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea , < f1718da051282698aa8fa150bebb9724f6389fda (git)
Affected: bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea , < 40b94ec7edbbb867c4e26a1a43d2b898f04b93c5 (git)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V4.0 (custom)
guessed Create a notification for this product.
Show details on NVD website
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          "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."
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T07:18:17+00:00",
      "cve": "CVE-2026-23032",
      "id": "CVE-2026-23032",
      "initial_release_date": "2026-01-31T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: null_blk: fix kmemleak by releasing references to fault configfs items",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23032.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-06-03T02:29:27Z",
      "cve": "CVE-2026-23032",
      "id": "CVE-2026-23032",
      "initial_release_date": "2026-02-01T00:23:40Z",
      "product_status:known_affected": "37",
      "product_status:known_not_affected": "137",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23032",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23032.json",
      "version": "9"
    }
  }
}



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