{"id":"CVE-2026-74308","title":"ext4: fix kernel BUG in ext4_write_inline_data_end","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix kernel BUG in ext4_write_inline_data_end\n\nWhen the data=journal mount option is used, the ext4_journalled_write_end()\nfunction incorrectly calls ext4_write_in…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < 13db1ccae4d38f6d9296ee74aa1d39b429959ddb","Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < 260830a9a706f5d335398236fc788ce32f220de1","Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < 9808ae9fae996afa942bd963a39c9b1cdeebd0bd","Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < f00f5c0dd55319bc33b76f72c853bda0e0a32eda","Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < 0ae42b51607240990614e0843f0d3529aaff62cc","Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < ad09aa45965d3fafaf9963bc78109b73c0f9ac8d","Linux 3.8"],"published":"2026-08-15","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:29:41.200Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74308","references":[{"url":"https://git.kernel.org/stable/c/13db1ccae4d38f6d9296ee74aa1d39b429959ddb"},{"url":"https://git.kernel.org/stable/c/260830a9a706f5d335398236fc788ce32f220de1"},{"url":"https://git.kernel.org/stable/c/9808ae9fae996afa942bd963a39c9b1cdeebd0bd"},{"url":"https://git.kernel.org/stable/c/f00f5c0dd55319bc33b76f72c853bda0e0a32eda"},{"url":"https://git.kernel.org/stable/c/0ae42b51607240990614e0843f0d3529aaff62cc"},{"url":"https://git.kernel.org/stable/c/ad09aa45965d3fafaf9963bc78109b73c0f9ac8d"}],"tags":["cve.org"],"epss":0.00173,"epssPercentile":0.06711,"ingestedAt":"2026-11-05T15:02:32.535Z","slug":"CVE-2026-74308","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\next4: fix kernel BUG in ext4_write_inline_data_end\n\nWhen the data=journal mount option is used, the ext4_journalled_write_end()\nfunction incorrectly calls ext4_write_inline_data_end() without checking\nif the EXT4_STATE_MAY_INLINE_DATA flag is still set on the inode.\n\nIf a previous attempt to convert the inline data to an extent failed (e.g.\ndue to ENOSPC), the EXT4_STATE_MAY_INLINE_DATA flag is cleared, but\nthe EXT4_INODE_INLINE_DATA flag remains set. In this scenario, the next\ncall to ext4_write_begin() will not prepare the inline data xattr for\nwriting, but ext4_journalled_write_end() will incorrectly attempt to write\nto it, triggering a BUG_ON(pos + len > EXT4_I(inode)->i_inline_size) in\next4_write_inline_data() since i_inline_size was not expanded.\n\nFix this by ensuring that ext4_journalled_write_end() only calls\next4_write_inline_data_end() if the EXT4_STATE_MAY_INLINE_DATA flag is\nset, mirroring the behavior of ext4_write_end() and ext4_da_write_end().\n\n## Affected\n\n- `Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < 13db1ccae4d38f6d9296ee74aa1d39b429959ddb`\n- `Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < 260830a9a706f5d335398236fc788ce32f220de1`\n- `Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < 9808ae9fae996afa942bd963a39c9b1cdeebd0bd`\n- `Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < f00f5c0dd55319bc33b76f72c853bda0e0a32eda`\n- `Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < 0ae42b51607240990614e0843f0d3529aaff62cc`\n- `Linux >= 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb < ad09aa45965d3fafaf9963bc78109b73c0f9ac8d`\n- `Linux 3.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}