CVE-2023-53270
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix i_disksize exceeding i_size problem in paritally written case
It is possible for i_disksize can exceed i_size, triggering a warning.
generic_perform_write copied = iov_iter_copy_from_user_atomic(len) // copied < len ext4_da_write_end | ext4_update_i_disksize | new_i_size = pos + copied; | WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize) // update i_disksize | generic_write_end | copied = block_write_end(copied, len) // copied = 0 | if (unlikely(copied < len)) | if (!PageUptodate(page)) | copied = 0; | if (pos + copied > inode->i_size) // return false if (unlikely(copied == 0)) goto again; if (unlikely(iov_iter_fault_in_readable(i, bytes))) { status = -EFAULT; break; }
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We get i_disksize greater than i_size here, which could trigger WARNING check 'i_size_read(inode) < EXT4_I(inode)->i_disksize' while doing dio:
ext4_dio_write_iter iomap_dio_rw __iomap_dio_rw // return err, length is not aligned to 512 ext4_handle_inode_extension WARN_ON_ONCE(i_size_read(inode) < EXT4_I(inode)->i_disksize) // Oops
Fix it by updating 'copied' value before updating i_disksize just like ext4_write_inline_data_end() does.
A reproducer can be found in the buganizer link below.
Detalles técnicos trazas, registros y código del informe original
WARNING: CPU: 2 PID: 2609 at fs/ext4/file.c:319 CPU: 2 PID: 2609 Comm: aa Not tainted 6.3.0-rc2 RIP: 0010:ext4_file_write_iter+0xbc7 Call Trace: vfs_write+0x3b1 ksys_write+0x77 do_syscall_64+0x39
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.15%
- Percentil entre todas las CVEs puntuadas: 4
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/18eb23891aeae3229baf8c7c23b76be3364e1967
- https://git.kernel.org/stable/c/1dedde690303c05ef732b7c5c8356fdf60a4ade3
- https://git.kernel.org/stable/c/3ecea2fee14227712694c8b54ad99d471e61de92
- https://git.kernel.org/stable/c/53877ed201baa6b58f7ce9df92664a839113c30e
- https://git.kernel.org/stable/c/d30090eb546d993ea3f3023452540c476ea614a5
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix i_disksize exceeding i_size problem in paritally written case\n\nIt is possible for i_disksize can exceed i_size, triggering a warning.\n\ngeneric_perform_write\n copied = iov_iter_copy_from_user_atomic(len) // copied < len\n ext4_da_write_end\n | ext4_update_i_disksize\n | new_i_size = pos + copied;\n | WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize) // update i_disksize\n | generic_write_end\n | copied = block_write_end(copied, len) // copied = 0\n | if (unlikely(copied < len))\n | if (!PageUptodate(page))\n | copied = 0;\n | if (pos + copied > inode->i_size) // return false\n if (unlikely(copied == 0))\n goto again;\n if (unlikely(iov_iter_fault_in_readable(i, bytes))) {\n status = -EFAULT;\n break;\n }\n\nWe get i_disksize greater than i_size here, which could trigger WARNING\ncheck 'i_size_read(inode) < EXT4_I(inode)->i_disksize' while doing dio:\n\next4_dio_write_iter\n iomap_dio_rw\n __iomap_dio_rw // return err, length is not aligned to 512\n ext4_handle_inode_extension\n WARN_ON_ONCE(i_size_read(inode) < EXT4_I(inode)->i_disksize) // Oops\n\n WARNING: CPU: 2 PID: 2609 at fs/ext4/file.c:319\n CPU: 2 PID: 2609 Comm: aa Not tainted 6.3.0-rc2\n RIP: 0010:ext4_file_write_iter+0xbc7\n Call Trace:\n vfs_write+0x3b1\n ksys_write+0x77\n do_syscall_64+0x39\n\nFix it by updating 'copied' value before updating i_disksize just like\next4_write_inline_data_end() does.\n\nA reproducer can be found in the buganizer link below."
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