CVE-2022-50344 (GCVE-0-2022-50344)
Vulnerability from cvelistv5
Published
2025-09-16 16:11
Modified
2025-09-16 16:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix null-ptr-deref in ext4_write_info I caught a null-ptr-deref bug as follows: ================================================================== KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 1 PID: 1589 Comm: umount Not tainted 5.10.0-02219-dirty #339 RIP: 0010:ext4_write_info+0x53/0x1b0 [...] Call Trace: dquot_writeback_dquots+0x341/0x9a0 ext4_sync_fs+0x19e/0x800 __sync_filesystem+0x83/0x100 sync_filesystem+0x89/0xf0 generic_shutdown_super+0x79/0x3e0 kill_block_super+0xa1/0x110 deactivate_locked_super+0xac/0x130 deactivate_super+0xb6/0xd0 cleanup_mnt+0x289/0x400 __cleanup_mnt+0x16/0x20 task_work_run+0x11c/0x1c0 exit_to_user_mode_prepare+0x203/0x210 syscall_exit_to_user_mode+0x5b/0x3a0 do_syscall_64+0x59/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ================================================================== Above issue may happen as follows: ------------------------------------- exit_to_user_mode_prepare task_work_run __cleanup_mnt cleanup_mnt deactivate_super deactivate_locked_super kill_block_super generic_shutdown_super shrink_dcache_for_umount dentry = sb->s_root sb->s_root = NULL <--- Here set NULL sync_filesystem __sync_filesystem sb->s_op->sync_fs > ext4_sync_fs dquot_writeback_dquots sb->dq_op->write_info > ext4_write_info ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2) d_inode(sb->s_root) s_root->d_inode <--- Null pointer dereference To solve this problem, we use ext4_journal_start_sb directly to avoid s_root being used.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3638aa1c7d87c0ca0aef23cf58cae2c48e7daca4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4a657319cfabd6199fd0b7b65bbebf6ded7a11c1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/533c60a0b97cee5daab376933f486207e6680fb7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/947264e00c46de19a016fd81218118c708fed2f3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bb420e8afc854d2a1caaa23a0c129839acfb7888
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc451578446afd03c0c21913993c08898a691435
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f34ab95162763cd7352f46df169296eec28b688d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f4b5ff0b794aa94afac7269c494550ca2f66511b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9c1f248607d5546075d3f731e7607d5571f2b60
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
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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\next4: fix null-ptr-deref in ext4_write_info\n\nI caught a null-ptr-deref bug as follows:\n==================================================================\nKASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]\nCPU: 1 PID: 1589 Comm: umount Not tainted 5.10.0-02219-dirty #339\nRIP: 0010:ext4_write_info+0x53/0x1b0\n[...]\nCall Trace:\n dquot_writeback_dquots+0x341/0x9a0\n ext4_sync_fs+0x19e/0x800\n __sync_filesystem+0x83/0x100\n sync_filesystem+0x89/0xf0\n generic_shutdown_super+0x79/0x3e0\n kill_block_super+0xa1/0x110\n deactivate_locked_super+0xac/0x130\n deactivate_super+0xb6/0xd0\n cleanup_mnt+0x289/0x400\n __cleanup_mnt+0x16/0x20\n task_work_run+0x11c/0x1c0\n exit_to_user_mode_prepare+0x203/0x210\n syscall_exit_to_user_mode+0x5b/0x3a0\n do_syscall_64+0x59/0x70\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n ==================================================================\n\nAbove issue may happen as follows:\n-------------------------------------\nexit_to_user_mode_prepare\n task_work_run\n  __cleanup_mnt\n   cleanup_mnt\n    deactivate_super\n     deactivate_locked_super\n      kill_block_super\n       generic_shutdown_super\n        shrink_dcache_for_umount\n         dentry = sb-\u003es_root\n         sb-\u003es_root = NULL              \u003c--- Here set NULL\n        sync_filesystem\n         __sync_filesystem\n          sb-\u003es_op-\u003esync_fs \u003e ext4_sync_fs\n           dquot_writeback_dquots\n            sb-\u003edq_op-\u003ewrite_info \u003e ext4_write_info\n             ext4_journal_start(d_inode(sb-\u003es_root), EXT4_HT_QUOTA, 2)\n              d_inode(sb-\u003es_root)\n               s_root-\u003ed_inode          \u003c--- Null pointer dereference\n\nTo solve this problem, we use ext4_journal_start_sb directly\nto avoid s_root being used."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-16T16:11:36.950Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/dc451578446afd03c0c21913993c08898a691435"
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          "url": "https://git.kernel.org/stable/c/533c60a0b97cee5daab376933f486207e6680fb7"
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        {
          "url": "https://git.kernel.org/stable/c/f9c1f248607d5546075d3f731e7607d5571f2b60"
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      "title": "ext4: fix null-ptr-deref in ext4_write_info",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50344",
    "datePublished": "2025-09-16T16:11:23.345Z",
    "dateReserved": "2025-09-16T16:03:27.881Z",
    "dateUpdated": "2025-09-16T16:11:36.950Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50344\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T17:15:34.070\",\"lastModified\":\"2025-09-17T14:18:55.093\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix null-ptr-deref in ext4_write_info\\n\\nI caught a null-ptr-deref bug as follows:\\n==================================================================\\nKASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]\\nCPU: 1 PID: 1589 Comm: umount Not tainted 5.10.0-02219-dirty #339\\nRIP: 0010:ext4_write_info+0x53/0x1b0\\n[...]\\nCall Trace:\\n dquot_writeback_dquots+0x341/0x9a0\\n ext4_sync_fs+0x19e/0x800\\n __sync_filesystem+0x83/0x100\\n sync_filesystem+0x89/0xf0\\n generic_shutdown_super+0x79/0x3e0\\n kill_block_super+0xa1/0x110\\n deactivate_locked_super+0xac/0x130\\n deactivate_super+0xb6/0xd0\\n cleanup_mnt+0x289/0x400\\n __cleanup_mnt+0x16/0x20\\n task_work_run+0x11c/0x1c0\\n exit_to_user_mode_prepare+0x203/0x210\\n syscall_exit_to_user_mode+0x5b/0x3a0\\n do_syscall_64+0x59/0x70\\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\\n ==================================================================\\n\\nAbove issue may happen as follows:\\n-------------------------------------\\nexit_to_user_mode_prepare\\n task_work_run\\n  __cleanup_mnt\\n   cleanup_mnt\\n    deactivate_super\\n     deactivate_locked_super\\n      kill_block_super\\n       generic_shutdown_super\\n        shrink_dcache_for_umount\\n         dentry = sb-\u003es_root\\n         sb-\u003es_root = NULL              \u003c--- Here set NULL\\n        sync_filesystem\\n         __sync_filesystem\\n          sb-\u003es_op-\u003esync_fs \u003e ext4_sync_fs\\n           dquot_writeback_dquots\\n            sb-\u003edq_op-\u003ewrite_info \u003e ext4_write_info\\n             ext4_journal_start(d_inode(sb-\u003es_root), EXT4_HT_QUOTA, 2)\\n              d_inode(sb-\u003es_root)\\n               s_root-\u003ed_inode          \u003c--- Null pointer dereference\\n\\nTo solve this problem, we use ext4_journal_start_sb directly\\nto avoid s_root being used.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3638aa1c7d87c0ca0aef23cf58cae2c48e7daca4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a657319cfabd6199fd0b7b65bbebf6ded7a11c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/533c60a0b97cee5daab376933f486207e6680fb7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/947264e00c46de19a016fd81218118c708fed2f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb420e8afc854d2a1caaa23a0c129839acfb7888\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc451578446afd03c0c21913993c08898a691435\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f34ab95162763cd7352f46df169296eec28b688d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f4b5ff0b794aa94afac7269c494550ca2f66511b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f9c1f248607d5546075d3f731e7607d5571f2b60\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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