CVE-2022-50344 (GCVE-0-2022-50344)

Vulnerability from cvelistv5 – Published: 2025-09-16 16:11 – Updated: 2026-01-14 18:22
VLAI?
Title
ext4: fix null-ptr-deref in ext4_write_info
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.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a1177825719ccef3f76ef39bbfd5ebb6087d53c7 , < dc451578446afd03c0c21913993c08898a691435 (git)
Affected: a1177825719ccef3f76ef39bbfd5ebb6087d53c7 , < f4b5ff0b794aa94afac7269c494550ca2f66511b (git)
Affected: a1177825719ccef3f76ef39bbfd5ebb6087d53c7 , < 947264e00c46de19a016fd81218118c708fed2f3 (git)
Affected: a1177825719ccef3f76ef39bbfd5ebb6087d53c7 , < 3638aa1c7d87c0ca0aef23cf58cae2c48e7daca4 (git)
Affected: a1177825719ccef3f76ef39bbfd5ebb6087d53c7 , < f34ab95162763cd7352f46df169296eec28b688d (git)
Affected: a1177825719ccef3f76ef39bbfd5ebb6087d53c7 , < 533c60a0b97cee5daab376933f486207e6680fb7 (git)
Affected: a1177825719ccef3f76ef39bbfd5ebb6087d53c7 , < 4a657319cfabd6199fd0b7b65bbebf6ded7a11c1 (git)
Affected: a1177825719ccef3f76ef39bbfd5ebb6087d53c7 , < bb420e8afc854d2a1caaa23a0c129839acfb7888 (git)
Affected: a1177825719ccef3f76ef39bbfd5ebb6087d53c7 , < f9c1f248607d5546075d3f731e7607d5571f2b60 (git)
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    Linux Linux Affected: 3.6
Unaffected: 0 , < 3.6 (semver)
Unaffected: 4.9.331 , ≤ 4.9.* (semver)
Unaffected: 4.14.296 , ≤ 4.14.* (semver)
Unaffected: 4.19.262 , ≤ 4.19.* (semver)
Unaffected: 5.4.220 , ≤ 5.4.* (semver)
Unaffected: 5.10.150 , ≤ 5.10.* (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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          "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."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/dc451578446afd03c0c21913993c08898a691435"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4b5ff0b794aa94afac7269c494550ca2f66511b"
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          "url": "https://git.kernel.org/stable/c/947264e00c46de19a016fd81218118c708fed2f3"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50344",
    "datePublished": "2025-09-16T16:11:23.345Z",
    "dateReserved": "2025-09-16T16:03:27.881Z",
    "dateUpdated": "2026-01-14T18:22:58.181Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
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\"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.9.331\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.296\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.262\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.220\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.150\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.75\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.19.17\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.19.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/super.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/dc451578446afd03c0c21913993c08898a691435\"}, {\"url\": \"https://git.kernel.org/stable/c/f4b5ff0b794aa94afac7269c494550ca2f66511b\"}, {\"url\": \"https://git.kernel.org/stable/c/947264e00c46de19a016fd81218118c708fed2f3\"}, {\"url\": \"https://git.kernel.org/stable/c/3638aa1c7d87c0ca0aef23cf58cae2c48e7daca4\"}, {\"url\": \"https://git.kernel.org/stable/c/f34ab95162763cd7352f46df169296eec28b688d\"}, {\"url\": \"https://git.kernel.org/stable/c/533c60a0b97cee5daab376933f486207e6680fb7\"}, {\"url\": \"https://git.kernel.org/stable/c/4a657319cfabd6199fd0b7b65bbebf6ded7a11c1\"}, {\"url\": \"https://git.kernel.org/stable/c/bb420e8afc854d2a1caaa23a0c129839acfb7888\"}, {\"url\": \"https://git.kernel.org/stable/c/f9c1f248607d5546075d3f731e7607d5571f2b60\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.331\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.296\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.262\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.220\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.150\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.75\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19.17\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.3\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"3.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-23T13:28:53.932Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-50344\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-14T18:22:58.181Z\", \"dateReserved\": \"2025-09-16T16:03:27.881Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-16T16:11:23.345Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

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.