{"id":"CVE-2023-53101","title":"ext4: zero i_disksize when initializing the bootloader inode","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: zero i_disksize when initializing the bootloader inode\n\nIf the boot loader inode has never been used before, the\nEXT4_IOC_SWAP_BOOT inode will initialize it, incl…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < d6c1447e483c05dbcfb3ff77ac04237a82070b8c","Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 59eee0cdf8c036f554add97a4da7c06d7a9ff34a","Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 0d8a6c9a6415999fee1259ccf1796480c026b7d6","Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 3f00c476da8fe7c4c34ea16abb55d74127120413","Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 01a821aacc64d4b05dafd239dbc9b7856686002f","Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 9cb27b1e76f0cc886ac09055bc41c0ab3f205167","Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 9e9a4cc5486356158554f6ad73027d8635a48b34","Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < f5361da1e60d54ec81346aee8e3d8baf1be0b762","Linux 3.10"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:17:14.306407Z"},"published":"2025-05-02","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:21:00.964Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-53101","references":[{"url":"https://git.kernel.org/stable/c/d6c1447e483c05dbcfb3ff77ac04237a82070b8c"},{"url":"https://git.kernel.org/stable/c/59eee0cdf8c036f554add97a4da7c06d7a9ff34a"},{"url":"https://git.kernel.org/stable/c/0d8a6c9a6415999fee1259ccf1796480c026b7d6"},{"url":"https://git.kernel.org/stable/c/3f00c476da8fe7c4c34ea16abb55d74127120413"},{"url":"https://git.kernel.org/stable/c/01a821aacc64d4b05dafd239dbc9b7856686002f"},{"url":"https://git.kernel.org/stable/c/9cb27b1e76f0cc886ac09055bc41c0ab3f205167"},{"url":"https://git.kernel.org/stable/c/9e9a4cc5486356158554f6ad73027d8635a48b34"},{"url":"https://git.kernel.org/stable/c/f5361da1e60d54ec81346aee8e3d8baf1be0b762"}],"tags":["cve.org"],"epss":0.00204,"epssPercentile":0.10481,"ingestedAt":"2026-11-05T22:38:31.769Z","slug":"CVE-2023-53101","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\next4: zero i_disksize when initializing the bootloader inode\n\nIf the boot loader inode has never been used before, the\nEXT4_IOC_SWAP_BOOT inode will initialize it, including setting the\ni_size to 0.  However, if the \"never before used\" boot loader has a\nnon-zero i_size, then i_disksize will be non-zero, and the\ninconsistency between i_size and i_disksize can trigger a kernel\nwarning:\n\n WARNING: CPU: 0 PID: 2580 at fs/ext4/file.c:319\n CPU: 0 PID: 2580 Comm: bb Not tainted 6.3.0-rc1-00004-g703695902cfa\n RIP: 0010:ext4_file_write_iter+0xbc7/0xd10\n Call Trace:\n  vfs_write+0x3b1/0x5c0\n  ksys_write+0x77/0x160\n  __x64_sys_write+0x22/0x30\n  do_syscall_64+0x39/0x80\n\nReproducer:\n 1. create corrupted image and mount it:\n       mke2fs -t ext4 /tmp/foo.img 200\n       debugfs -wR \"sif <5> size 25700\" /tmp/foo.img\n       mount -t ext4 /tmp/foo.img /mnt\n       cd /mnt\n       echo 123 > file\n 2. Run the reproducer program:\n       posix_memalign(&buf, 1024, 1024)\n       fd = open(\"file\", O_RDWR | O_DIRECT);\n       ioctl(fd, EXT4_IOC_SWAP_BOOT);\n       write(fd, buf, 1024);\n\nFix this by setting i_disksize as well as i_size to zero when\ninitiaizing the boot loader inode.\n\n## Affected\n\n- `Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < d6c1447e483c05dbcfb3ff77ac04237a82070b8c`\n- `Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 59eee0cdf8c036f554add97a4da7c06d7a9ff34a`\n- `Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 0d8a6c9a6415999fee1259ccf1796480c026b7d6`\n- `Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 3f00c476da8fe7c4c34ea16abb55d74127120413`\n- `Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 01a821aacc64d4b05dafd239dbc9b7856686002f`\n- `Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 9cb27b1e76f0cc886ac09055bc41c0ab3f205167`\n- `Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < 9e9a4cc5486356158554f6ad73027d8635a48b34`\n- `Linux >= 393d1d1d76933886d5e1ce603214c9987589c6d5 < f5361da1e60d54ec81346aee8e3d8baf1be0b762`\n- `Linux 3.10`\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":[]}