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
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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Siemens RUGGEDCOM RST2428P Affected: 0 , < V4.0 (custom)
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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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    "dateReserved": "2026-01-13T15:37:45.942Z",
    "dateUpdated": "2026-06-02T13:00:53.339Z",
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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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnull_blk: corrige kmemleak al liberar referencias a elementos configfs de fallo\\n\\nCuando CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION est\u00e1 habilitado, el controlador null-blk configura el soporte de inyecci\u00f3n de fallos al crear los elementos configfs timeout_inject, requeue_inject e init_hctx_fault_inject como hijos del grupo configfs nullbX de nivel superior.\\n\\nSin embargo, cuando se elimina el dispositivo nullbX, las referencias tomadas a estos elementos configfs de configuraci\u00f3n de fallos no se liberan. Como resultado, kmemleak informa de una fuga de memoria, por ejemplo:\\n\\nobjeto sin referencia 0xc00000021ff25c40 (tama\u00f1o 32):\\n  comm \u0027mkdir\u0027, pid 10665, jiffies 4322121578\\n  volcado hexadecimal (primeros 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  rastreo (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\\nSolucione esto liberando expl\u00edcitamente las referencias a los elementos configfs de configuraci\u00f3n de fallos al eliminar la referencia al grupo configfs nullbX de nivel superior.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/block/null_blk/main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea\",\"lessThan\":\"1a3286edf4d48ce37f8982ff3c3b65159a5ecbb2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea\",\"lessThan\":\"d59ba448ccd595d5d65e197216cf781a87db2b28\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea\",\"lessThan\":\"f1718da051282698aa8fa150bebb9724f6389fda\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea\",\"lessThan\":\"40b94ec7edbbb867c4e26a1a43d2b898f04b93c5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/block/null_blk/main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.122\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.67\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.7\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"RUGGEDCOM RST2428P\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"V4.0\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"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\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-253495.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.