{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-49347", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.543Z", "datePublished": "2025-02-26T02:11:01.983Z", "dateUpdated": "2026-05-11T18:57:56.471Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T18:57:56.471Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug_on in ext4_writepages\n\nwe got issue as follows:\nEXT4-fs error (device loop0): ext4_mb_generate_buddy:1141: group 0, block bitmap and bg descriptor inconsistent: 25 vs 31513 free cls\n------------[ cut here ]------------\nkernel BUG at fs/ext4/inode.c:2708!\ninvalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 2 PID: 2147 Comm: rep Not tainted 5.18.0-rc2-next-20220413+ #155\nRIP: 0010:ext4_writepages+0x1977/0x1c10\nRSP: 0018:ffff88811d3e7880 EFLAGS: 00010246\nRAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88811c098000\nRDX: 0000000000000000 RSI: ffff88811c098000 RDI: 0000000000000002\nRBP: ffff888128140f50 R08: ffffffffb1ff6387 R09: 0000000000000000\nR10: 0000000000000007 R11: ffffed10250281ea R12: 0000000000000001\nR13: 00000000000000a4 R14: ffff88811d3e7bb8 R15: ffff888128141028\nFS: 00007f443aed9740(0000) GS:ffff8883aef00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020007200 CR3: 000000011c2a4000 CR4: 00000000000006e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n do_writepages+0x130/0x3a0\n filemap_fdatawrite_wbc+0x83/0xa0\n filemap_flush+0xab/0xe0\n ext4_alloc_da_blocks+0x51/0x120\n __ext4_ioctl+0x1534/0x3210\n __x64_sys_ioctl+0x12c/0x170\n do_syscall_64+0x3b/0x90\n\nIt may happen as follows:\n1. write inline_data inode\nvfs_write\n new_sync_write\n ext4_file_write_iter\n ext4_buffered_write_iter\n generic_perform_write\n ext4_da_write_begin\n ext4_da_write_inline_data_begin -> If inline data size too\n small will allocate block to write, then mapping will has\n dirty page\n ext4_da_convert_inline_data_to_extent ->clear EXT4_STATE_MAY_INLINE_DATA\n2. fallocate\ndo_vfs_ioctl\n ioctl_preallocate\n vfs_fallocate\n ext4_fallocate\n ext4_convert_inline_data\n ext4_convert_inline_data_nolock\n ext4_map_blocks -> fail will goto restore data\n ext4_restore_inline_data\n ext4_create_inline_data\n ext4_write_inline_data\n ext4_set_inode_state -> set inode EXT4_STATE_MAY_INLINE_DATA\n3. writepages\n__ext4_ioctl\n ext4_alloc_da_blocks\n filemap_flush\n filemap_fdatawrite_wbc\n do_writepages\n ext4_writepages\n if (ext4_has_inline_data(inode))\n BUG_ON(ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))\n\nThe root cause of this issue is we destory inline data until call\next4_writepages under delay allocation mode. But there maybe already\nconvert from inline to extent. To solve this issue, we call\nfilemap_flush first.."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/inline.c"], "versions": [{"version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "lessThan": "19918ec7717d87d5ab825884a46b26b21375d7ce", "status": "affected", "versionType": "git"}, {"version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "lessThan": "b2b78f5bf2d453dda3903955efee059260787a42", "status": "affected", "versionType": "git"}, {"version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "lessThan": "de1732b5c1693ad489c5d254f124f67cb775f37d", "status": "affected", "versionType": "git"}, {"version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "lessThan": "73fd5b19285197078ee8a2e651d75d5b094a4de9", "status": "affected", "versionType": "git"}, {"version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "lessThan": "1b061af037646c9cdb0afd8a8d2f1e1c06285866", "status": "affected", "versionType": "git"}, {"version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "lessThan": "18a759f7f99f0b65a08ff5b7e745fc405a42bde4", "status": "affected", "versionType": "git"}, {"version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "lessThan": "1cde35417edc0370fb0179a4e38b78a15350a8d0", "status": "affected", "versionType": "git"}, {"version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "lessThan": "013f12bdedb96816aaa27ee04349f4433d361f52", "status": "affected", "versionType": "git"}, {"version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "lessThan": "ef09ed5d37b84d18562b30cf7253e57062d0db05", "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/inline.c"], "versions": [{"version": "3.8", "status": "affected"}, {"version": "0", "lessThan": "3.8", 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But there maybe already\nconvert from inline to extent. To solve this issue, we call\nfilemap_flush first.."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: correcci\u00f3n de bug_on en ext4_writepages. Tenemos el siguiente problema: Error EXT4-fs (dispositivo loop0): ext4_mb_generate_buddy:1141: grupo 0, mapa de bits de bloque y descriptor de fondo inconsistentes: 25 frente a 31513 cls libres ------------[ corte aqu\u00ed ]------------ \u00a1ERROR del kernel en fs/ext4/inode.c:2708! c\u00f3digo de operaci\u00f3n no v\u00e1lido: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 2 PID: 2147 Comm: rep No contaminado 5.18.0-rc2-next-20220413+ #155 RIP: 0010:ext4_writepages+0x1977/0x1c10 RSP: 0018:ffff88811d3e7880 EFLAGS: 00010246 RAX: 000000000000000 RBX: 0000000000000001 RCX: ffff88811c098000 RDX: 0000000000000000 RSI: ffff88811c098000 RDI: 00000000000000002 RBP: ffff888128140f50 R08: ffffffffb1ff6387 R09: 0000000000000000 R10: 0000000000000007 R11: ffffed10250281ea R12: 000000000000001 R13: 00000000000000a4 R14: ffff88811d3e7bb8 R15: ffff888128141028 FS: 00007f443aed9740(0000) GS:ffff8883aef00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020007200 CR3: 000000011c2a4000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas: do_writepages+0x130/0x3a0 filemap_fdatawrite_wbc+0x83/0xa0 filemap_flush+0xab/0xe0 ext4_alloc_da_blocks+0x51/0x120 __ext4_ioctl+0x1534/0x3210 __x64_sys_ioctl+0x12c/0x170 do_syscall_64+0x3b/0x90 Puede suceder de la siguiente manera: 1. escribir inline_data inodo vfs_write new_sync_write ext4_file_write_iter ext4_buffered_write_iter generic_perform_write ext4_da_write_begin ext4_da_write_inline_data_begin -&gt; Si el tama\u00f1o de los datos en l\u00ednea es demasiado peque\u00f1o, se asignar\u00e1 un bloque para escribir, luego la asignaci\u00f3n tendr\u00e1 una p\u00e1gina sucia ext4_da_convert_inline_data_to_extent -&gt; borrar EXT4_STATE_MAY_INLINE_DATA 2. fallocate do_vfs_ioctl ioctl_preallocate vfs_fallocate ext4_fallocate ext4_convert_inline_data ext4_convert_inline_data_nolock ext4_map_blocks -&gt; falla ir\u00e1 a restaurar datos ext4_restore_inline_data ext4_crear_inline_data ext4_write_inline_data ext4_set_inode_state -&gt; establecer inodo EXT4_STATE_MAY_INLINE_DATA 3. writepages __ext4_ioctl ext4_alloc_da_blocks filemap_flush filemap_fdatawrite_wbc do_writepages ext4_writepages si (ext4_has_inline_data(inodo)) BUG_ON(ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) La causa principal de este problema es que destruimos los datos en l\u00ednea hasta que llamamos a ext4_writepages en el modo de asignaci\u00f3n de demora. Pero es posible que ya hayamos convertido de en l\u00ednea a extendido. Para resolver este problema, primero llamamos a filemap_flush."}], "id": "CVE-2022-49347", "lastModified": "2025-09-22T20:28:12.087", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-02-26T07:01:11.433", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/013f12bdedb96816aaa27ee04349f4433d361f52"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/18a759f7f99f0b65a08ff5b7e745fc405a42bde4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/19918ec7717d87d5ab825884a46b26b21375d7ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1b061af037646c9cdb0afd8a8d2f1e1c06285866"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1cde35417edc0370fb0179a4e38b78a15350a8d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73fd5b19285197078ee8a2e651d75d5b094a4de9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b2b78f5bf2d453dda3903955efee059260787a42"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/de1732b5c1693ad489c5d254f124f67cb775f37d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ef09ed5d37b84d18562b30cf7253e57062d0db05"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2022:7683", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-425.3.1.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-11-08T00:00:00Z"}, {"advisory": "RHSA-2022:8267", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}, {"advisory": "RHSA-2022:8267", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}], "bugzilla": {"description": "kernel: ext4: fix bug_on in ext4_writepages", "id": "2347821", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347821"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\next4: fix bug_on in ext4_writepages\nwe got issue as follows:\nEXT4-fs error (device loop0): ext4_mb_generate_buddy:1141: group 0, block bitmap and bg descriptor inconsistent: 25 vs 31513 free cls\n------------[ cut here ]------------\nkernel BUG at fs/ext4/inode.c:2708!\ninvalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 2 PID: 2147 Comm: rep Not tainted 5.18.0-rc2-next-20220413+ #155\nRIP: 0010:ext4_writepages+0x1977/0x1c10\nRSP: 0018:ffff88811d3e7880 EFLAGS: 00010246\nRAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88811c098000\nRDX: 0000000000000000 RSI: ffff88811c098000 RDI: 0000000000000002\nRBP: ffff888128140f50 R08: ffffffffb1ff6387 R09: 0000000000000000\nR10: 0000000000000007 R11: ffffed10250281ea R12: 0000000000000001\nR13: 00000000000000a4 R14: ffff88811d3e7bb8 R15: ffff888128141028\nFS: 00007f443aed9740(0000) GS:ffff8883aef00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020007200 CR3: 000000011c2a4000 CR4: 00000000000006e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n<TASK>\ndo_writepages+0x130/0x3a0\nfilemap_fdatawrite_wbc+0x83/0xa0\nfilemap_flush+0xab/0xe0\next4_alloc_da_blocks+0x51/0x120\n__ext4_ioctl+0x1534/0x3210\n__x64_sys_ioctl+0x12c/0x170\ndo_syscall_64+0x3b/0x90\nIt may happen as follows:\n1. write inline_data inode\nvfs_write\nnew_sync_write\next4_file_write_iter\next4_buffered_write_iter\ngeneric_perform_write\next4_da_write_begin\next4_da_write_inline_data_begin -> If inline data size too\nsmall will allocate block to write, then mapping will has\ndirty page\next4_da_convert_inline_data_to_extent ->clear EXT4_STATE_MAY_INLINE_DATA\n2. fallocate\ndo_vfs_ioctl\nioctl_preallocate\nvfs_fallocate\next4_fallocate\next4_convert_inline_data\next4_convert_inline_data_nolock\next4_map_blocks -> fail will goto restore data\next4_restore_inline_data\next4_create_inline_data\next4_write_inline_data\next4_set_inode_state -> set inode EXT4_STATE_MAY_INLINE_DATA\n3. writepages\n__ext4_ioctl\next4_alloc_da_blocks\nfilemap_flush\nfilemap_fdatawrite_wbc\ndo_writepages\next4_writepages\nif (ext4_has_inline_data(inode))\nBUG_ON(ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))\nThe root cause of this issue is we destory inline data until call\next4_writepages under delay allocation mode. But there maybe already\nconvert from inline to extent. To solve this issue, we call\nfilemap_flush first.."], "name": "CVE-2022-49347", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49347\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49347\nhttps://lore.kernel.org/linux-cve-announce/2025022642-CVE-2022-49347-6ba6@gregkh/T"], "threat_severity": "Moderate"}

{}