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This prevents the filesystem from entering an\ninconsistent state where the inline data flag is set but the file size\nexceeds what can be stored inline.\n\nWithout this fix, the following sequence causes a kernel BUG_ON():\n\n1. Mount filesystem with inode that has inline flag set and small size\n2. truncate(file, 50MB) - grows size but inline flag remains set\n3. sendfile() attempts to write data\n4. ext4_write_inline_data() hits BUG_ON(write_size > inline_capacity)\n\nThe crash occurs because ext4_write_inline_data() expects inline storage\nto accommodate the write, but the actual inline capacity (~60 bytes for\ni_block + ~96 bytes for xattrs) is far smaller than the file size and\nwrite request.\n\nThe fix checks if the new size from setattr exceeds the inode's actual\ninline capacity (EXT4_I(inode)->i_inline_size) and converts the file to\nextent-based storage before proceeding with the size change.\n\nThis addresses the root cause by ensuring the inline data flag and file\nsize remain consistent during truncate operations."}], "id": "CVE-2026-31452", "lastModified": "2026-05-06T20:12:35.460", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "[email protected]", "type": "Primary"}]}, "published": "2026-04-22T14:16:39.460", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/07c1a31af18290054da3d18221b8bf58983c5d3a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/110d7ef602659ce4d7947c5480f7ca2779696aaf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/699bac4d4c951974d55b045c983d1de777215949"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7920dcc571cef3d8aa9ee109c136125d61d41669"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/93cb2d103e5c707de0f7ad58a39b7f0fddc27aa6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c047332be7195833a5c5126816c2502df8269fe4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed9356a30e59c7cc3198e7fc46cfedf3767b9b17"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f53a5d9f32924bc2a810d2df243b7714da58b636"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ext4: convert inline data to extents when truncate exceeds inline size", "id": "2460722", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460722"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-130", "details": ["A flaw was found in the Linux kernel's ext4 filesystem. A local user could exploit a vulnerability where the `truncate()` function, when used to expand a file beyond its inline data capacity, fails to properly convert the file to extent-based storage. This inconsistency can lead to a kernel crash (BUG_ON) if a subsequent write operation, such as `sendfile()`, attempts to write data to the oversized inline file. This issue results in a denial of service."], "name": "CVE-2026-31452", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31452\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31452\nhttps://lore.kernel.org/linux-cve-announce/2026042248-CVE-2026-31452-9f5b@gregkh/T"], "threat_severity": "Moderate"}

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