{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50344", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-16T16:03:27.881Z", "datePublished": "2025-09-16T16:11:23.345Z", "dateUpdated": "2026-05-11T19:17:37.555Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:17:37.555Z" }, "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->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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ext4/super.c" ], "versions": [ { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "lessThan": "dc451578446afd03c0c21913993c08898a691435", "status": "affected", "versionType": "git" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "lessThan": "f4b5ff0b794aa94afac7269c494550ca2f66511b", "status": "affected", "versionType": "git" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "lessThan": "947264e00c46de19a016fd81218118c708fed2f3", "status": "affected", "versionType": "git" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "lessThan": "3638aa1c7d87c0ca0aef23cf58cae2c48e7daca4", "status": "affected", "versionType": "git" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "lessThan": "f34ab95162763cd7352f46df169296eec28b688d", "status": "affected", "versionType": "git" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "lessThan": "533c60a0b97cee5daab376933f486207e6680fb7", "status": "affected", "versionType": "git" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "lessThan": "4a657319cfabd6199fd0b7b65bbebf6ded7a11c1", "status": "affected", "versionType": "git" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "lessThan": "bb420e8afc854d2a1caaa23a0c129839acfb7888", "status": "affected", "versionType": "git" }, { "version": "a1177825719ccef3f76ef39bbfd5ebb6087d53c7", "lessThan": "f9c1f248607d5546075d3f731e7607d5571f2b60", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ext4/super.c" ], "versions": [ { "version": "3.6", "status": "affected" }, { "version": "0", "lessThan": "3.6", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.331", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.296", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.262", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.220", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.150", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.75", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.3", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "4.9.331" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "4.14.296" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "4.19.262" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "5.4.220" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "5.10.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "5.15.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "5.19.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "6.0.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "6.1" } ] } ] } ], "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" } ], "title": "ext4: fix null-ptr-deref in ext4_write_info", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-50344", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T18:20:39.263791Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T18:22:58.181Z" } } ] } }