{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43067", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.981Z", "datePublished": "2026-05-05T15:23:26.717Z", "dateUpdated": "2026-05-05T15:23:26.717Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-05T15:23:26.717Z"}, "descriptions": [{"lang": "en", "value": "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->ac_g_ex.fe_group is >= ngroups (for instance, if the goal\n group was populated via stream allocation from s_mb_last_groups),\n then start will be >= 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()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/mballoc.c"], "versions": [{"version": "9d89b9d55e25cb340c5b4b769876edc551b7a9ff", "lessThan": "f89bba144938921a2249237ad04a0183ff3f8930", "status": "affected", "versionType": "git"}, {"version": "1b0edd6022a3f44ce87fea9959a9310f4628fbea", "lessThan": "83170a05908b6cf2fb3235d3065bf613ff866f3c", "status": "affected", "versionType": "git"}, {"version": "9eea2f57d11b30049ff996ac3eff6e0dc8089e5f", "lessThan": "4bec4a498ce86314d470ae6144120461f2138c29", "status": "affected", "versionType": "git"}, {"version": "34c803edc0b3365a42efcf9815acab63b4cf54e0", "lessThan": "12624c5b724a81e14e532972b40d863b0de3b7d1", "status": "affected", "versionType": "git"}, {"version": "321ed8d559c951e71ad2d2d69a4cf0445644e865", "lessThan": "2a368ccddfc492a0aa951e2caef2985f20e96503", "status": "affected", "versionType": "git"}, {"version": "4865c768b563deff1b6a6384e74a62f143427b42", "lessThan": "bb81702370fad22c06ca12b6e1648754dbc37e0f", "status": "affected", "versionType": "git"}, {"version": "16fce6b6c0b247258c6c217fce5a48abf50f6964", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/mballoc.c"], "versions": [{"version": "6.1.167", "lessThan": "6.1.168", "status": "affected", "versionType": "semver"}, {"version": "6.6.130", "lessThan": "6.6.134", "status": "affected", "versionType": "semver"}, {"version": "6.12.77", "lessThan": "6.12.80", "status": "affected", "versionType": "semver"}, {"version": "6.18.14", "lessThan": "6.18.21", "status": "affected", "versionType": "semver"}, {"version": "6.19.4", "lessThan": "6.19.11", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.167", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.130", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.77", "versionEndExcluding": "6.12.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.14", "versionEndExcluding": "6.18.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.4", "versionEndExcluding": "6.19.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.203"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f89bba144938921a2249237ad04a0183ff3f8930"}, {"url": "https://git.kernel.org/stable/c/83170a05908b6cf2fb3235d3065bf613ff866f3c"}, {"url": "https://git.kernel.org/stable/c/4bec4a498ce86314d470ae6144120461f2138c29"}, {"url": "https://git.kernel.org/stable/c/12624c5b724a81e14e532972b40d863b0de3b7d1"}, {"url": "https://git.kernel.org/stable/c/2a368ccddfc492a0aa951e2caef2985f20e96503"}, {"url": "https://git.kernel.org/stable/c/bb81702370fad22c06ca12b6e1648754dbc37e0f"}], "title": "ext4: handle wraparound when searching for blocks for indirect mapped blocks", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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->ac_g_ex.fe_group is >= ngroups (for instance, if the goal\n group was populated via stream allocation from s_mb_last_groups),\n then start will be >= 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()."}], "id": "CVE-2026-43067", "lastModified": "2026-05-05T16:16:15.937", "metrics": {}, "published": "2026-05-05T16:16:15.937", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/12624c5b724a81e14e532972b40d863b0de3b7d1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2a368ccddfc492a0aa951e2caef2985f20e96503"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4bec4a498ce86314d470ae6144120461f2138c29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/83170a05908b6cf2fb3235d3065bf613ff866f3c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bb81702370fad22c06ca12b6e1648754dbc37e0f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f89bba144938921a2249237ad04a0183ff3f8930"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d89b9d55e25cb340c5b4b769876edc551b7a9ff,f89bba144938921a2249237ad04a0183ff3f8930)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1b0edd6022a3f44ce87fea9959a9310f4628fbea,83170a05908b6cf2fb3235d3065bf613ff866f3c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9eea2f57d11b30049ff996ac3eff6e0dc8089e5f,4bec4a498ce86314d470ae6144120461f2138c29)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[34c803edc0b3365a42efcf9815acab63b4cf54e0,12624c5b724a81e14e532972b40d863b0de3b7d1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[321ed8d559c951e71ad2d2d69a4cf0445644e865,2a368ccddfc492a0aa951e2caef2985f20e96503)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4865c768b563deff1b6a6384e74a62f143427b42,bb81702370fad22c06ca12b6e1648754dbc37e0f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[16fce6b6c0b247258c6c217fce5a48abf50f6964,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.167,6.1.168)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.130,6.6.134)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.77,6.12.80)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.14,6.18.21)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.19.4,6.19.11)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-05T18:00:12.708089+00:00", "updated": "2026-05-05T18:00:13.730035+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-190"]}