{ "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-2022-49708", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49708", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-02-26T02:24:26.142Z", "updatedAt": "2026-05-23T15:22:46.811Z", "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 ext4_mb_use_inode_pa", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug_on ext4_mb_use_inode_pa\n\nHulk Robot reported a BUG_ON:\n==================================================================\nkernel BUG at fs/ext4/mballoc.c:3211!\n[...]\nRIP: 0010:ext4_mb_mark_diskspace_used.cold+0x85/0x136f\n[...]\nCall Trace:\n ext4_mb_new_blocks+0x9df/0x5d30\n ext4_ext_map_blocks+0x1803/0x4d80\n ext4_map_blocks+0x3a4/0x1a10\n ext4_writepages+0x126d/0x2c30\n do_writepages+0x7f/0x1b0\n __filemap_fdatawrite_range+0x285/0x3b0\n file_write_and_wait_range+0xb1/0x140\n ext4_sync_file+0x1aa/0xca0\n vfs_fsync_range+0xfb/0x260\n do_fsync+0x48/0xa0\n[...]\n==================================================================\n\nAbove issue may happen as follows:\n-------------------------------------\ndo_fsync\n vfs_fsync_range\n ext4_sync_file\n file_write_and_wait_range\n __filemap_fdatawrite_range\n do_writepages\n ext4_writepages\n mpage_map_and_submit_extent\n mpage_map_one_extent\n ext4_map_blocks\n ext4_mb_new_blocks\n ext4_mb_normalize_request\n >>> start + size <= ac->ac_o_ex.fe_logical\n ext4_mb_regular_allocator\n ext4_mb_simple_scan_group\n ext4_mb_use_best_found\n ext4_mb_new_preallocation\n ext4_mb_new_inode_pa\n ext4_mb_use_inode_pa\n >>> set ac->ac_b_ex.fe_len <= 0\n ext4_mb_mark_diskspace_used\n >>> BUG_ON(ac->ac_b_ex.fe_len <= 0);\n\nwe can easily reproduce this problem with the following commands:\n\t`fallocate -l100M disk`\n\t`mkfs.ext4 -b 1024 -g 256 disk`\n\t`mount disk /mnt`\n\t`fsstress -d /mnt -l 0 -n 1000 -p 1`\n\nThe size must be smaller than or equal to EXT4_BLOCKS_PER_GROUP.\nTherefore, \"start + size <= ac->ac_o_ex.fe_logical\" may occur\nwhen the size is truncated. So start should be the start position of\nthe group where ac_o_ex.fe_logical is located after alignment.\nIn addition, when the value of fe_logical or EXT4_BLOCKS_PER_GROUP\nis very large, the value calculated by start_off is more accurate.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "fc6c2da174edd7a7b760b12c60d432d300e05cca", "status": "affected", "versionType": "git", "lessThan": "6880fb2e64331b9fdc85d3f32b1d7e81ad8703f1" }, { "version": "cd648b8a8fd5071d232242d5ee7ee3c0815776af", "status": "affected", "versionType": "git", "lessThan": "a37c1359714da42517dd19d36fc3c4d17edba832" }, { "version": "cd648b8a8fd5071d232242d5ee7ee3c0815776af", "status": "affected", "versionType": "git", "lessThan": "5707d721d1819db57dba57b1d4623034fcb32047" }, { "version": "cd648b8a8fd5071d232242d5ee7ee3c0815776af", "status": "affected", "versionType": "git", "lessThan": "a6b31616e5afe1d3972cb0682a373e50597faf5c" }, { "version": "cd648b8a8fd5071d232242d5ee7ee3c0815776af", "status": "affected", "versionType": "git", "lessThan": "6fdaf31ad5f3d3afab744dfd9a8b0d9142aa881f" }, { "version": "cd648b8a8fd5071d232242d5ee7ee3c0815776af", "status": "affected", "versionType": "git", "lessThan": "90f0f9d45dff0128c0fca0d2358c4153b024afa6" }, { "version": "cd648b8a8fd5071d232242d5ee7ee3c0815776af", "status": "affected", "versionType": "git", "lessThan": "887a3e9ad4b8309a2266bce7ae749b2bf1f7a687" }, { "version": "cd648b8a8fd5071d232242d5ee7ee3c0815776af", "status": "affected", "versionType": "git", "lessThan": "a08f789d2ab5242c07e716baf9a835725046be89" }, { "version": "f213db429b883a2d5403de0b1ce92fb7d7ee979e", "status": "affected", "versionType": "git" }, { "version": "98f58e05231f835dfb09359e3b5e3a886fe8f189", "status": "affected", "versionType": "git" }, { "version": "c1664e9bcf6291c0ceb8599f57c8cf493526abe6", "status": "affected", "versionType": "git" }, { "version": "37cf4ab1ba60c30ca9fd0fe3b9993b24cb87886a", "status": "affected", "versionType": "git" }, { "version": "75f37dab088eb84ff25a49e59371f01ea3f44aa7", "status": "affected", "versionType": "git" }, { "version": "8774c73cf6963310395823ed7077ea12943ea0f3", "status": "affected", "versionType": "git" }, { "version": "c4fbdc0124799f1772f4d886b7f2e1a6f881d195", "status": "affected", "versionType": "git" }, { "version": "4.9.14", "status": "affected", "versionType": "semver", "lessThan": "4.9.320" }, { "version": "3.2.89", "status": "affected", "versionType": "semver", "lessThan": "3.3" }, { "version": "3.10.107", "status": "affected", "versionType": "semver", "lessThan": "3.11" }, { "version": "3.12.72", "status": "affected", "versionType": "semver", "lessThan": "3.13" }, { "version": "3.16.44", "status": "affected", "versionType": "semver", "lessThan": "3.17" }, { "version": "4.1.40", "status": "affected", "versionType": "semver", "lessThan": "4.2" }, { "version": "4.4.53", "status": "affected", "versionType": "semver", "lessThan": "4.5" }, { "version": "4.10.2", "status": "affected", "versionType": "semver", "lessThan": "4.11" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.11", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.11" }, { "version": "4.9.320", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.285", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.249", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.200", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.124", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.49", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.18.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.18.*" }, { "version": "5.19", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }