{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49349", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.544Z", "datePublished": "2025-02-26T02:11:02.993Z", "dateUpdated": "2026-08-05T08:54:51.229Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:54:51.229Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_rename_dir_prepare\n\nWe got issue as follows:\nEXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue\next4_get_first_dir_block: bh->b_data=0xffff88810bee6000 len=34478\next4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh->b_data=0xffff88810bee6000\next4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae\n==================================================================\nBUG: KASAN: use-after-free in ext4_rename_dir_prepare+0x152/0x220\nRead of size 4 at addr ffff88810beee6ae by task rep/1895\n\nCPU: 13 PID: 1895 Comm: rep Not tainted 5.10.0+ #241\nCall Trace:\n dump_stack+0xbe/0xf9\n print_address_description.constprop.0+0x1e/0x220\n kasan_report.cold+0x37/0x7f\n ext4_rename_dir_prepare+0x152/0x220\n ext4_rename+0xf44/0x1ad0\n ext4_rename2+0x11c/0x170\n vfs_rename+0xa84/0x1440\n do_renameat2+0x683/0x8f0\n __x64_sys_renameat+0x53/0x60\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\nRIP: 0033:0x7f45a6fc41c9\nRSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f45a6fc41c9\nRDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005\nRBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080\nR10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0\nR13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000\n\nThe buggy address belongs to the page:\npage:00000000440015ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x10beee\nflags: 0x200000000000000()\nraw: 0200000000000000 ffffea00043ff4c8 ffffea0004325608 0000000000000000\nraw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff88810beee580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n>ffff88810beee680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ^\n ffff88810beee700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n==================================================================\nDisabling lock debugging due to kernel taint\next4_rename_dir_prepare: [2] parent_de->inode=3537895424\next4_rename_dir_prepare: [3] dir=0xffff888124170140\next4_rename_dir_prepare: [4] ino=2\next4_rename_dir_prepare: ent->dir->i_ino=2 parent=-757071872\n\nReason is first directory entry which 'rec_len' is 34478, then will get illegal\nparent entry. Now, we do not check directory entry after read directory block\nin 'ext4_get_first_dir_block'.\nTo solve this issue, check directory entry in 'ext4_get_first_dir_block'.\n\n[ Trigger an ext4_error() instead of just warning if the directory is\n missing a '.' or '..' entry. Also make sure we return an error code\n if the file system is corrupted. -TYT ]" } ], "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 via the local VFS rename path (renameat → vfs_rename → ext4_rename → ext4_rename_dir_prepare → ext4_get_first_dir_block) after mounting a crafted ext4 image; there is no network-protocol or packet-processing entry into this path.\nAC:L - A crafted first directory entry with an oversized rec_len (e.g. 34478) deterministically makes ext4_next_entry compute a parent_de past the buffer_head into freed memory; the attacker fully controls on-disk dirents with no race or attacker-uncontrollable layout required.\nPR:N - The attacker needs no privileges on the target—only a malicious ext4 image (USB/SD/loop); ext4 lacks FS_USERNS_MOUNT, so CAP_SYS_ADMIN belongs to the victim or automount path that mounts the volume.\nUI:R - Exploitation requires a user or automount/storage daemon to mount the attacker-supplied ext4 volume and then rename a crafted directory so the corrupt '.' / '..' walk runs in ext4_rename_dir_prepare.\nS:U - Impact is host-kernel heap/page UAF within the same OS security authority; this is standard local privilege escalation, not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - KASAN demonstrates a use-after-free read of parent_de->inode from a freed page; UAF reclaim/heap spray yields arbitrary kernel read primitives, scored Confidentiality High per UAF guidance.\nI:H - If sprayed freed-page contents satisfy the parent inode check, ext4_rename_dir_finish writes through the dangling parent_de pointer (parent_de->inode = dir_ino), yielding a UAF write / control-flow hijack primitive scored Integrity High.\nA:H - The demonstrated KASAN use-after-free in ext4_rename_dir_prepare and subsequent dangling-pointer use can oops/panic the kernel even without full exploitation, so Availability impact is High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ext4/namei.c" ], "versions": [ { "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4", "lessThan": "1a3a15bf6f9963d755270cbdb282863b84839195", "status": "affected", "versionType": "git" }, { "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4", "lessThan": "97f802a652a749422dede32071d29a53cf4bd034", "status": "affected", "versionType": "git" }, { "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4", "lessThan": "10801095224de0d0ab06ae60698680c1f883a3ae", "status": "affected", "versionType": "git" }, { "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4", "lessThan": "eaecf7ebfd5dd09038a80b14be46b844f54cfc5c", "status": "affected", "versionType": "git" }, { "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4", "lessThan": "dd887f83ea54aea5b780a84527e23ab95f777fed", "status": "affected", "versionType": "git" }, { "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4", "lessThan": "364380c00912bed9b5d99eb485018360b0ecf64f", "status": "affected", "versionType": "git" }, { "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4", "lessThan": "0ff38b99fa075ddd246487a28cb9af049f4ceef1", "status": "affected", "versionType": "git" }, { "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4", "lessThan": "4a2bea60cf7ff957b3eda0b17750d483876a02fa", "status": "affected", "versionType": "git" }, { "version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4", "lessThan": "0be698ecbe4471fcad80e81ec6a05001421041b3", "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/namei.c" ], "versions": [ { "version": "3.8", "status": "affected" }, { "version": "0", "lessThan": "3.8", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.318", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.283", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.247", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.198", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.121", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.46", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.14", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "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": "3.8", "versionEndExcluding": "4.9.318" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "4.14.283" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "4.19.247" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.4.198" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.10.121" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.15.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.17.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.18.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1a3a15bf6f9963d755270cbdb282863b84839195" }, { "url": "https://git.kernel.org/stable/c/97f802a652a749422dede32071d29a53cf4bd034" }, { "url": "https://git.kernel.org/stable/c/10801095224de0d0ab06ae60698680c1f883a3ae" }, { "url": "https://git.kernel.org/stable/c/eaecf7ebfd5dd09038a80b14be46b844f54cfc5c" }, { "url": "https://git.kernel.org/stable/c/dd887f83ea54aea5b780a84527e23ab95f777fed" }, { "url": "https://git.kernel.org/stable/c/364380c00912bed9b5d99eb485018360b0ecf64f" }, { "url": "https://git.kernel.org/stable/c/0ff38b99fa075ddd246487a28cb9af049f4ceef1" }, { "url": "https://git.kernel.org/stable/c/4a2bea60cf7ff957b3eda0b17750d483876a02fa" }, { "url": "https://git.kernel.org/stable/c/0be698ecbe4471fcad80e81ec6a05001421041b3" } ], "title": "ext4: fix use-after-free in ext4_rename_dir_prepare", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-49349", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-27T18:16:42.619044Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-27T18:22:33.920Z" } } ] } }