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

Vulnerability from cvelistv5 – Published: 2025-09-16 16:11 – Updated: 2026-05-11 19:17
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:20 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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          "title": "ext4: fix null-ptr-deref in ext4_write_info",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "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": "2026-01-14T18:22:58.181Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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