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
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)
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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)
guessed Create a notification for this product.
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            },
            {
              "url": "https://git.kernel.org/stable/c/4a657319cfabd6199fd0b7b65bbebf6ded7a11c1"
            },
            {
              "url": "https://git.kernel.org/stable/c/bb420e8afc854d2a1caaa23a0c129839acfb7888"
            },
            {
              "url": "https://git.kernel.org/stable/c/f9c1f248607d5546075d3f731e7607d5571f2b60"
            }
          ],
          "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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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

Author Source Type Date Other

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.