{ "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-2022-49347", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49347", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-02-26T02:11:01.983Z", "updatedAt": "2026-05-11T18:57:56.471Z", "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 bug_on in ext4_writepages", "summary": "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 \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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "status": "affected", "versionType": "git", "lessThan": "19918ec7717d87d5ab825884a46b26b21375d7ce" }, { "version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "status": "affected", "versionType": "git", "lessThan": "b2b78f5bf2d453dda3903955efee059260787a42" }, { "version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "status": "affected", "versionType": "git", "lessThan": "de1732b5c1693ad489c5d254f124f67cb775f37d" }, { "version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "status": "affected", "versionType": "git", "lessThan": "73fd5b19285197078ee8a2e651d75d5b094a4de9" }, { "version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "status": "affected", "versionType": "git", "lessThan": "1b061af037646c9cdb0afd8a8d2f1e1c06285866" }, { "version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "status": "affected", "versionType": "git", "lessThan": "18a759f7f99f0b65a08ff5b7e745fc405a42bde4" }, { "version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "status": "affected", "versionType": "git", "lessThan": "1cde35417edc0370fb0179a4e38b78a15350a8d0" }, { "version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "status": "affected", "versionType": "git", "lessThan": "013f12bdedb96816aaa27ee04349f4433d361f52" }, { "version": "3c47d54170b6a678875566b1b8d6dcf57904e49b", "status": "affected", "versionType": "git", "lessThan": "ef09ed5d37b84d18562b30cf7253e57062d0db05" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.8", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.8" }, { "version": "4.9.318", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.283", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.247", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.198", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.121", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.46", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.17.14", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.17.*" }, { "version": "5.18.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.18.*" }, { "version": "5.19", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }