{"id":"CVE-2023-53101","summary":"ext4: zero i_disksize when initializing the bootloader inode","details":"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, 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 \u003c5\u003e size 25700\" /tmp/foo.img\n       mount -t ext4 /tmp/foo.img /mnt\n       cd /mnt\n       echo 123 \u003e 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.","modified":"2026-04-11T12:46:40.845547Z","published":"2025-05-02T15:55:43.804Z","related":["SUSE-SU-2025:01918-1","SUSE-SU-2025:01966-1","SUSE-SU-2025:01983-1","SUSE-SU-2025:02173-1","SUSE-SU-2025:02262-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53101.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/01a821aacc64d4b05dafd239dbc9b7856686002f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0d8a6c9a6415999fee1259ccf1796480c026b7d6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3f00c476da8fe7c4c34ea16abb55d74127120413"},{"type":"WEB","url":"https://git.kernel.org/stable/c/59eee0cdf8c036f554add97a4da7c06d7a9ff34a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9cb27b1e76f0cc886ac09055bc41c0ab3f205167"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9e9a4cc5486356158554f6ad73027d8635a48b34"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d6c1447e483c05dbcfb3ff77ac04237a82070b8c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f5361da1e60d54ec81346aee8e3d8baf1be0b762"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53101.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53101"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"393d1d1d76933886d5e1ce603214c9987589c6d5"},{"fixed":"d6c1447e483c05dbcfb3ff77ac04237a82070b8c"},{"fixed":"59eee0cdf8c036f554add97a4da7c06d7a9ff34a"},{"fixed":"0d8a6c9a6415999fee1259ccf1796480c026b7d6"},{"fixed":"3f00c476da8fe7c4c34ea16abb55d74127120413"},{"fixed":"01a821aacc64d4b05dafd239dbc9b7856686002f"},{"fixed":"9cb27b1e76f0cc886ac09055bc41c0ab3f205167"},{"fixed":"9e9a4cc5486356158554f6ad73027d8635a48b34"},{"fixed":"f5361da1e60d54ec81346aee8e3d8baf1be0b762"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53101.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.10.0"},{"fixed":"4.14.310"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.278"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.237"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.103"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.20"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53101.json"}}],"schema_version":"1.7.5"}