{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50673", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-09T01:26:45.991Z", "datePublished": "2025-12-09T01:29:25.220Z", "dateUpdated": "2026-08-05T08:59:21.383Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:59:21.383Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_orphan_cleanup\n\nI caught a issue as follows:\n==================================================================\n BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0\n Read of size 8 at addr ffff88814b13f378 by task mount/710\n\n CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370\n Call Trace:\n \n dump_stack_lvl+0x73/0x9f\n print_report+0x25d/0x759\n kasan_report+0xc0/0x120\n __asan_load8+0x99/0x140\n __list_add_valid+0x28/0x1a0\n ext4_orphan_cleanup+0x564/0x9d0 [ext4]\n __ext4_fill_super+0x48e2/0x5300 [ext4]\n ext4_fill_super+0x19f/0x3a0 [ext4]\n get_tree_bdev+0x27b/0x450\n ext4_get_tree+0x19/0x30 [ext4]\n vfs_get_tree+0x49/0x150\n path_mount+0xaae/0x1350\n do_mount+0xe2/0x110\n __x64_sys_mount+0xf0/0x190\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n \n [...]\n==================================================================\n\nAbove issue may happen as follows:\n-------------------------------------\next4_fill_super\n ext4_orphan_cleanup\n --- loop1: assume last_orphan is 12 ---\n list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan)\n ext4_truncate --> return 0\n ext4_inode_attach_jinode --> return -ENOMEM\n iput(inode) --> free inode<12>\n --- loop2: last_orphan is still 12 ---\n list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);\n // use inode<12> and trigger UAF\n\nTo solve this issue, we need to propagate the return value of\next4_inode_attach_jinode() appropriately." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached only through the local VFS mount path (mount → ext4_fill_super → ext4_orphan_cleanup → ext4_process_orphan → ext4_truncate); it is not reachable from network protocol handlers or packet processing.\nAC:L - An attacker who crafts an ext4 image with truncate orphans (nlink>0, non-block-aligned i_size) controls the on-disk state that forces the attach_jinode path; on memory-constrained deployments (Android/embedded/IoT) that ENOMEM is reliably inducible, after which orphan cleanup loops on the same inode and the UAF is deterministic.\nPR:N - No privileges on the target are required—only a malicious ext4 image (USB/SD, disk image, or media presented to udisks/Android vold automount); the attacker need not hold CAP_SYS_ADMIN on the victim host.\nUI:R - ext4 lacks FS_USERNS_MOUNT and mount_capable() requires capable(CAP_SYS_ADMIN) in the init user namespace, so a user or automount daemon must mount the attacker-supplied image for the orphan-cleanup UAF to run.\nS:U - Impact is a host-kernel heap use-after-free during local mount/orphan cleanup within the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - This is a confirmed KASAN use-after-free of an ext4 inode on the orphan list; per UAF guidance, reclaim of the freed object enables arbitrary kernel memory disclosure primitives.\nI:H - The UAF corrupts the orphan list via list_add on a freed inode and enables heap spraying/arbitrary write and control-flow hijack primitives, so integrity impact is High.\nA:H - The KASAN report shows a kernel oops on the freed inode during orphan cleanup, and the stuck s_last_orphan loop can hang or crash the mount path, yielding High availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ext4/inode.c" ], "versions": [ { "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13", "lessThan": "7f801a1593cb957f73659732836b2dafbdfc7709", "status": "affected", "versionType": "git" }, { "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13", "lessThan": "026a4490b5381229a30f23d073b58e8e35ee6858", "status": "affected", "versionType": "git" }, { "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13", "lessThan": "7223d5e75f26352354ea2c0ccf8b579821b52adf", "status": "affected", "versionType": "git" }, { "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13", "lessThan": "cf0e0817b0f925b70d101d7014ea81b7094e1159", "status": "affected", "versionType": "git" }, { "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13", "lessThan": "c2bdbd4c69308835d1b6f6ba74feeccbfe113478", "status": "affected", "versionType": "git" }, { "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13", "lessThan": "7908b8a541b1578cc61b4da7f19b604a931441da", "status": "affected", "versionType": "git" }, { "version": "2c98eb5ea249767bbc11cf4e70e91d5b0458ed13", "lessThan": "a71248b1accb2b42e4980afef4fa4a27fa0e36f5", "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/inode.c" ], "versions": [ { "version": "4.10", "status": "affected" }, { "version": "0", "lessThan": "4.10", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.270", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.87", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.18", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.4", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "4.10", "versionEndExcluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "5.15.87" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.0.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7f801a1593cb957f73659732836b2dafbdfc7709" }, { "url": "https://git.kernel.org/stable/c/026a4490b5381229a30f23d073b58e8e35ee6858" }, { "url": "https://git.kernel.org/stable/c/7223d5e75f26352354ea2c0ccf8b579821b52adf" }, { "url": "https://git.kernel.org/stable/c/cf0e0817b0f925b70d101d7014ea81b7094e1159" }, { "url": "https://git.kernel.org/stable/c/c2bdbd4c69308835d1b6f6ba74feeccbfe113478" }, { "url": "https://git.kernel.org/stable/c/7908b8a541b1578cc61b4da7f19b604a931441da" }, { "url": "https://git.kernel.org/stable/c/a71248b1accb2b42e4980afef4fa4a27fa0e36f5" } ], "title": "ext4: fix use-after-free in ext4_orphan_cleanup", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-06-16T15:48:47.172262Z", "id": "CVE-2022-50673", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-16T15:49:02.082Z" } } ] } }