cve-2024-26704
Vulnerability from cvelistv5
Published
2024-04-03 14:55
Modified
2024-09-11 17:33
Severity
Summary
ext4: fix double-free of blocks due to wrong extents moved_len
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website


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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26704\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-03T15:15:53.193\",\"lastModified\":\"2024-06-27T12:15:20.167\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix double-free of blocks due to wrong extents moved_len\\n\\nIn ext4_move_extents(), moved_len is only updated when all moves are\\nsuccessfully executed, and only discards orig_inode and donor_inode\\npreallocations when moved_len is not zero. When the loop fails to exit\\nafter successfully moving some extents, moved_len is not updated and\\nremains at 0, so it does not discard the preallocations.\\n\\nIf the moved extents overlap with the preallocated extents, the\\noverlapped extents are freed twice in ext4_mb_release_inode_pa() and\\next4_process_freed_data() (as described in commit 94d7c16cbbbd (\\\"ext4:\\nFix double-free of blocks with EXT4_IOC_MOVE_EXT\\\")), and bb_free is\\nincremented twice. Hence when trim is executed, a zero-division bug is\\ntriggered in mb_update_avg_fragment_size() because bb_free is not zero\\nand bb_fragments is zero.\\n\\nTherefore, update move_len after each extent move to avoid the issue.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: corrige la doble liberaci\u00f3n de bloques debido a extensiones incorrectas. moving_len En ext4_move_extents(), move_len solo se actualiza cuando todos los movimientos se ejecutan exitosamente y solo descarta las preasignaciones de orig_inode y donante_inode cuando se mueve_len no es cero. Cuando el bucle no sale despu\u00e9s de mover con \u00e9xito algunas extensiones, moving_len no se actualiza y permanece en 0, por lo que no descarta las asignaciones previas. Si las extensiones movidas se superponen con las extensiones preasignadas, las extensiones superpuestas se liberan dos veces en ext4_mb_release_inode_pa() y ext4_process_freed_data() (como se describe en el commit 94d7c16cbbbd (\\\"ext4: corrige la doble liberaci\u00f3n de bloques con EXT4_IOC_MOVE_EXT\\\")), y se incrementa bb_free dos veces. Por lo tanto, cuando se ejecuta trim, se activa un error de divisi\u00f3n cero en mb_update_avg_fragment_size() porque bb_free no es cero y bb_fragments es cero. Por lo tanto, actualice move_len despu\u00e9s de cada movimiento de extensi\u00f3n para evitar el problema.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/185eab30486ba3e7bf8b9c2e049c79a06ffd2bc1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2883940b19c38d5884c8626483811acf4d7e148f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/55583e899a5357308274601364741a83e78d6ac4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/559ddacb90da1d8786dd8ec4fd76bbfa404eaef6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/afba9d11320dad5ce222ac8964caf64b7b4bedb1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/afbcad9ae7d6d11608399188f03a837451b6b3a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b4fbb89d722cbb16beaaea234b7230faaaf68c71\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d033a555d9a1cf53dbf3301af7199cc4a4c8f537\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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