{"id":"CVE-2025-68796","summary":"f2fs: fix to avoid updating zero-sized extent in extent cache","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid updating zero-sized extent in extent cache\n\nAs syzbot reported:\n\nF2FS-fs (loop0): __update_extent_tree_range: extent len is zero, type: 0, extent [0, 0, 0], age [0, 0]\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/extent_cache.c:678!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nRIP: 0010:__update_extent_tree_range+0x13bc/0x1500 fs/f2fs/extent_cache.c:678\nCall Trace:\n \u003cTASK\u003e\n f2fs_update_read_extent_cache_range+0x192/0x3e0 fs/f2fs/extent_cache.c:1085\n f2fs_do_zero_range fs/f2fs/file.c:1657 [inline]\n f2fs_zero_range+0x10c1/0x1580 fs/f2fs/file.c:1737\n f2fs_fallocate+0x583/0x990 fs/f2fs/file.c:2030\n vfs_fallocate+0x669/0x7e0 fs/open.c:342\n ioctl_preallocate fs/ioctl.c:289 [inline]\n file_ioctl+0x611/0x780 fs/ioctl.c:-1\n do_vfs_ioctl+0xb33/0x1430 fs/ioctl.c:576\n __do_sys_ioctl fs/ioctl.c:595 [inline]\n __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f07bc58eec9\n\nIn error path of f2fs_zero_range(), it may add a zero-sized extent\ninto extent cache, it should be avoided.","modified":"2026-04-16T04:41:04.891762038Z","published":"2026-01-13T15:29:06.892Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68796.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4f244c64efe628d277b916f47071adf480eb8646"},{"type":"WEB","url":"https://git.kernel.org/stable/c/72c58a82e6fb7b327e8701f5786c70c3edc56188"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7c37c79510329cd951a4dedf3f7bf7e2b18dccec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9c07bd262c13ca922adad6e7613d48505f97f548"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bac23833220a1f8fe8dfab7e16efa20ff64d7589"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e50b81c50fcbe63f50405bb40f262162ff32af88"},{"type":"WEB","url":"https://git.kernel.org/stable/c/efe3371001f50a2d6f746b50bdc6f9f26b2089ec"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68796.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-68796"},{"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":"6e9619499f53b22ead972e476c0e8341c997d929"},{"fixed":"9c07bd262c13ca922adad6e7613d48505f97f548"},{"fixed":"72c58a82e6fb7b327e8701f5786c70c3edc56188"},{"fixed":"e50b81c50fcbe63f50405bb40f262162ff32af88"},{"fixed":"efe3371001f50a2d6f746b50bdc6f9f26b2089ec"},{"fixed":"4f244c64efe628d277b916f47071adf480eb8646"},{"fixed":"bac23833220a1f8fe8dfab7e16efa20ff64d7589"},{"fixed":"7c37c79510329cd951a4dedf3f7bf7e2b18dccec"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68796.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.7.0"},{"fixed":"5.10.248"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.198"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.120"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.64"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68796.json"}}],"schema_version":"1.7.5"}