{"id":"CVE-2026-43067","summary":"ext4: handle wraparound when searching for blocks for indirect mapped blocks","details":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: handle wraparound when searching for blocks for indirect mapped blocks\n\nCommit 4865c768b563 (\"ext4: always allocate blocks only from groups\ninode can use\") restricts what blocks will be allocated for indirect\nblock based files to block numbers that fit within 32-bit block\nnumbers.\n\nHowever, when using a review bot running on the latest Gemini LLM to\ncheck this commit when backporting into an LTS based kernel, it raised\nthis concern:\n\n   If ac-\u003eac_g_ex.fe_group is \u003e= ngroups (for instance, if the goal\n   group was populated via stream allocation from s_mb_last_groups),\n   then start will be \u003e= ngroups.\n\n   Does this allow allocating blocks beyond the 32-bit limit for\n   indirect block mapped files? The commit message mentions that\n   ext4_mb_scan_groups_linear() takes care to not select unsupported\n   groups. However, its loop uses group = *start, and the very first\n   iteration will call ext4_mb_scan_group() with this unsupported\n   group because next_linear_group() is only called at the end of the\n   iteration.\n\nAfter reviewing the code paths involved and considering the LLM\nreview, I determined that this can happen when there is a file system\nwhere some files/directories are extent-mapped and others are\nindirect-block mapped.  To address this, add a safety clamp in\next4_mb_scan_groups().","modified":"2026-08-12T03:51:47.225717828Z","published":"2026-05-05T15:23:26.717Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43067.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/12624c5b724a81e14e532972b40d863b0de3b7d1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2a368ccddfc492a0aa951e2caef2985f20e96503"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4bec4a498ce86314d470ae6144120461f2138c29"},{"type":"WEB","url":"https://git.kernel.org/stable/c/83170a05908b6cf2fb3235d3065bf613ff866f3c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bb81702370fad22c06ca12b6e1648754dbc37e0f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f89bba144938921a2249237ad04a0183ff3f8930"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43067.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43067"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9d89b9d55e25cb340c5b4b769876edc551b7a9ff"},{"fixed":"f89bba144938921a2249237ad04a0183ff3f8930"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1b0edd6022a3f44ce87fea9959a9310f4628fbea"},{"fixed":"83170a05908b6cf2fb3235d3065bf613ff866f3c"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9eea2f57d11b30049ff996ac3eff6e0dc8089e5f"},{"fixed":"4bec4a498ce86314d470ae6144120461f2138c29"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"34c803edc0b3365a42efcf9815acab63b4cf54e0"},{"fixed":"12624c5b724a81e14e532972b40d863b0de3b7d1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"321ed8d559c951e71ad2d2d69a4cf0445644e865"},{"fixed":"2a368ccddfc492a0aa951e2caef2985f20e96503"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4865c768b563deff1b6a6384e74a62f143427b42"},{"fixed":"bb81702370fad22c06ca12b6e1648754dbc37e0f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"16fce6b6c0b247258c6c217fce5a48abf50f6964"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.203"},{"fixed":"5.16"}]}],"versions":["v6.1.167","v6.6.133","v6.6.132","v6.6.131","v6.6.130","v6.12.79","v6.12.78","v6.12.77","v6.18.20","v6.18.19","v6.18.18","v6.18.17","v6.18.16","v6.18.15","v6.18.14","v6.19.10","v6.19.9","v6.19.8","v6.19.7","v6.19.6","v6.19.5","v6.19.4","v5.15.202","v5.15.201","v5.15.200","v5.15.199","v5.15.198","v5.15.197","v5.15.196","v5.15.195","v5.15.194","v5.15.193","v5.15.192","v5.15.191","v5.15.190","v5.15.189","v5.15.188","v5.15.187","v5.15.186","v5.15.185","v5.15.184","v5.15.183","v5.15.182","v5.15.181","v5.15.180","v5.15.179","v5.15.178","v5.15.177","v5.15.176","v5.15.175","v5.15.174","v5.15.173","v5.15.172","v5.15.171","v5.15.170","v5.15.169","v5.15.168","v5.15.167","v5.15.166","v5.15.165","v5.15.164","v5.15.163","v5.15.162","v5.15.161","v5.15.160","v5.15.159","v5.15.158","v5.15.157","v5.15.156","v5.15.155","v5.15.154","v5.15.153","v5.15.152","v5.15.151","v5.15.150","v5.15.149","v5.15.148","v5.15.147","v5.15.146","v5.15.145","v5.15.144","v5.15.143","v5.15.142","v5.15.141","v5.15.140","v5.15.139","v5.15.138","v5.15.137","v5.15.136","v5.15.135","v5.15.134","v5.15.133","v5.15.132","v5.15.131","v5.15.130","v5.15.129","v5.15.128","v5.15.127","v5.15.126","v5.15.125","v5.15.124","v5.15.123","v5.15.122","v5.15.121","v5.15.120","v5.15.119","v5.15.118","v5.15.117","v5.15.116","v5.15.115","v5.15.114","v5.15.113","v5.15.112","v5.15.111","v5.15.110","v5.15.109","v5.15.108","v5.15.107","v5.15.106","v5.15.105","v5.15.104","v5.15.103","v5.15.102","v5.15.101","v5.15.100","v5.15.99","v5.15.98","v5.15.97","v5.15.96","v5.15.95","v5.15.94","v5.15.93","v5.15.92","v5.15.91","v5.15.90","v5.15.89","v5.15.88","v5.15.87","v5.15.86","v5.15.85","v5.15.84","v5.15.83","v5.15.82","v5.15.81","v5.15.80","v5.15.79","v5.15.78","v5.15.77","v5.15.76","v5.15.75","v5.15.74","v5.15.73","v5.15.72","v5.15.71","v5.15.70","v5.15.69","v5.15.68","v5.15.67","v5.15.66","v5.15.65","v5.15.64","v5.15.63","v5.15.62","v5.15.61","v5.15.60","v5.15.59","v5.15.58","v5.15.57","v5.15.56","v5.15.55","v5.15.54","v5.15.53","v5.15.52","v5.15.51","v5.15.50","v5.15.49","v5.15.48","v5.15.47","v5.15.46","v5.15.45","v5.15.44","v5.15.43","v5.15.42","v5.15.41","v5.15.40","v5.15.39","v5.15.38","v5.15.37","v5.15.36","v5.15.35","v5.15.34","v5.15.33","v5.15.32","v5.15.31","v5.15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