CVE-2022-49708

{"id": "CVE-2022-49708", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2025-02-26T07:01:46.607", "references": [{"url": "https://git.kernel.org/stable/c/5707d721d1819db57dba57b1d4623034fcb32047", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6880fb2e64331b9fdc85d3f32b1d7e81ad8703f1", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6fdaf31ad5f3d3afab744dfd9a8b0d9142aa881f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/887a3e9ad4b8309a2266bce7ae749b2bf1f7a687", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/90f0f9d45dff0128c0fca0d2358c4153b024afa6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a08f789d2ab5242c07e716baf9a835725046be89", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a37c1359714da42517dd19d36fc3c4d17edba832", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a6b31616e5afe1d3972cb0682a373e50597faf5c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-617"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: correcci\u00f3n de bug_on ext4_mb_use_inode_pa Hulk Robot inform\u00f3 de un BUG_ON: ================================================================== kernel BUG at fs/ext4/mballoc.c:3211! [...] RIP: 0010:ext4_mb_mark_diskspace_used.cold+0x85/0x136f [...] Call Trace: ext4_mb_new_blocks+0x9df/0x5d30 ext4_ext_map_blocks+0x1803/0x4d80 ext4_map_blocks+0x3a4/0x1a10 ext4_writepages+0x126d/0x2c30 do_writepages+0x7f/0x1b0 __filemap_fdatawrite_range+0x285/0x3b0 file_write_and_wait_range+0xb1/0x140 ext4_sync_file+0x1aa/0xca0 vfs_fsync_range+0xfb/0x260 do_fsync+0x48/0xa0 [...] ================================================================== El problema anterior puede ocurrir de la siguiente manera: ------------------------------------- do_fsync vfs_fsync_range ext4_sync_file file_write_and_wait_range __filemap_fdatawrite_range do_writepages ext4_writepages mpage_map_and_submit_extent mpage_map_one_extent ext4_map_blocks ext4_mb_new_blocks ext4_mb_normalize_request &gt;&gt;&gt; start + size &lt;= ac-&gt;ac_o_ex.fe_logical ext4_mb_regular_allocator ext4_mb_simple_scan_group ext4_mb_use_best_found ext4_mb_new_preallocation ext4_mb_new_inode_pa ext4_mb_use_inode_pa &gt;&gt;&gt; set ac-&gt;ac_b_ex.fe_len &lt;= 0 ext4_mb_mark_diskspace_used &gt;&gt;&gt; BUG_ON(ac-&gt;ac_b_ex.fe_len &lt;= 0); podemos reproducir f\u00e1cilmente este problema con los siguientes comandos: `fallocate -l100M disk` `mkfs.ext4 -b 1024 -g 256 disk` `mount disk /mnt` `fsstress -d /mnt -l 0 -n 1000 -p 1` El tama\u00f1o debe ser menor o igual que EXT4_BLOCKS_PER_GROUP. Por lo tanto, puede aparecer \"start + size &lt;= ac-&gt;ac_o_ex.fe_logical\" cuando se trunca el tama\u00f1o. Por lo tanto, start debe ser la posici\u00f3n de inicio del grupo donde se encuentra ac_o_ex.fe_logical despu\u00e9s de la alineaci\u00f3n. Adem\u00e1s, cuando el valor de fe_logical o EXT4_BLOCKS_PER_GROUP es muy grande, el valor calculado por start_off es m\u00e1s preciso."}], "lastModified": "2025-10-24T15:53:52.730", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "62DA6B02-03A2-4BF6-B720-FF7688D0A6B7", "versionEndExcluding": "3.3", "versionStartIncluding": "3.2.89"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "76F03B46-D851-4BA1-BC94-1AA30AF8A93A", "versionEndExcluding": "3.11", "versionStartIncluding": "3.10.107"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "81CC1290-60AE-4CA1-9004-33F526A126CC", "versionEndExcluding": "3.13", "versionStartIncluding": "3.12.72"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9AC8E500-E50C-4CE7-BBB5-1AD2CEA1A297", "versionEndExcluding": "3.17", "versionStartIncluding": "3.16.44"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C80CE5E2-CA96-47D4-9D8C-220E0BD14249", "versionEndExcluding": "4.2", "versionStartIncluding": "4.1.40"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5AB7644C-B4B9-4495-AD26-3659130E9E74", "versionEndExcluding": "4.5", "versionStartIncluding": "4.4.53"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A7B11069-C394-4A5B-95FB-528C6F703405", "versionEndExcluding": "4.9.320", "versionStartIncluding": "4.9.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "233A43F4-DE2A-465E-88B0-7DCA43A9FE44", "versionEndExcluding": "4.14.285", "versionStartIncluding": "4.10.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8A08E48B-CA77-4A21-9558-17D61C146BE9", "versionEndExcluding": "4.19.249", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "80B2AE57-4A7E-40BB-8C83-33D4436CE199", "versionEndExcluding": "5.4.200", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6442F2CD-FF1C-4574-9948-138835E635D7", "versionEndExcluding": "5.10.124", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "697D250E-E0A4-41BE-BB54-96385E129206", "versionEndExcluding": "5.15.49", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CDD33A19-B51E-4090-A47B-073098916815", "versionEndExcluding": "5.18.6", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.19:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A8C30C2D-F82D-4D37-AB48-D76ABFBD5377"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.19:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BF8547FC-C849-4F1B-804B-A93AE2F04A92"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}