{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-50344", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-50344", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-09-16T16:11:23.345Z", "updatedAt": "2026-05-11T19:17:37.555Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ext4: fix null-ptr-deref in ext4_write_info", "summary": "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->s_root\n sb->s_root = NULL <--- Here set NULL\n sync_filesystem\n __sync_filesystem\n sb->s_op->sync_fs > ext4_sync_fs\n dquot_writeback_dquots\n sb->dq_op->write_info > ext4_write_info\n ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2)\n d_inode(sb->s_root)\n s_root->d_inode <--- Null pointer dereference\n\nTo solve this problem, we use ext4_journal_start_sb directly\nto avoid s_root being used.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "status": "affected", "versionType": "git", "lessThan": "dc451578446afd03c0c21913993c08898a691435" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "status": "affected", "versionType": "git", "lessThan": "f4b5ff0b794aa94afac7269c494550ca2f66511b" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "status": "affected", "versionType": "git", "lessThan": "947264e00c46de19a016fd81218118c708fed2f3" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "status": "affected", "versionType": "git", "lessThan": "3638aa1c7d87c0ca0aef23cf58cae2c48e7daca4" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "status": "affected", "versionType": "git", "lessThan": "f34ab95162763cd7352f46df169296eec28b688d" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "status": "affected", "versionType": "git", "lessThan": "533c60a0b97cee5daab376933f486207e6680fb7" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "status": "affected", "versionType": "git", "lessThan": "4a657319cfabd6199fd0b7b65bbebf6ded7a11c1" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "status": "affected", "versionType": "git", "lessThan": "bb420e8afc854d2a1caaa23a0c129839acfb7888" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "status": "affected", "versionType": "git", "lessThan": "f9c1f248607d5546075d3f731e7607d5571f2b60" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.6", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.6" }, { "version": "4.9.331", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.296", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.262", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.220", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.150", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.75", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.19.17", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.19.*" }, { "version": "6.0.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }