{"id":"CVE-2026-31596","summary":"ocfs2: handle invalid dinode in ocfs2_group_extend","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: handle invalid dinode in ocfs2_group_extend\n\n[BUG]\nkernel BUG at fs/ocfs2/resize.c:308!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nRIP: 0010:ocfs2_group_extend+0x10aa/0x1ae0 fs/ocfs2/resize.c:308\nCode: 8b8520ff ffff83f8 860f8580 030000e8 5cc3c1fe\nCall Trace:\n ...\n ocfs2_ioctl+0x175/0x6e0 fs/ocfs2/ioctl.c:869\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [inline]\n __se_sys_ioctl fs/ioctl.c:583 [inline]\n __x64_sys_ioctl+0x197/0x1e0 fs/ioctl.c:583\n x64_sys_call+0x1144/0x26a0 arch/x86/include/generated/asm/syscalls_64.h:17\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x93/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n ...\n\n[CAUSE]\nocfs2_group_extend() assumes that the global bitmap inode block\nreturned from ocfs2_inode_lock() has already been validated and\nBUG_ONs when the signature is not a dinode. That assumption is too\nstrong for crafted filesystems because the JBD2-managed buffer path\ncan bypass structural validation and return an invalid dinode to the\nresize ioctl.\n\n[FIX]\nValidate the dinode explicitly in ocfs2_group_extend(). If the global\nbitmap buffer does not contain a valid dinode, report filesystem\ncorruption with ocfs2_error() and fail the resize operation instead of\ncrashing the kernel.","modified":"2026-07-03T18:29:24.180491039Z","published":"2026-04-24T14:42:22.003Z","related":["CGA-2hqj-j5xg-678g","SUSE-SU-2026:22108-1","SUSE-SU-2026:22137-1","SUSE-SU-2026:22433-1","SUSE-SU-2026:2450-1","SUSE-SU-2026:2482-1","SUSE-SU-2026:2591-1","openSUSE-SU-2026:10703-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31596.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/10fb72c47aac446f12a4ccd962c7daa60cc890a1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/41c6e9bc3a09539deab43957a3211d902a4818f0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6575f9fbf084502b7118a628425bf7866666498d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7eafcf507fbd68f3276c00f6c02ef155ad69f79b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/911b557dd7817460881fd51a03069b539c674d0e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b328d8e7c437d0f026ba2c13788af6eae77700f1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e384a850a3370d89a7a446cdeccd964bfba2a302"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fabfa6b81bd386154d7e59f8cd8f760f9e68b48c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31596.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31596"},{"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":"10995aa2451afa20b721cc7de856cae1a13dba57"},{"fixed":"7eafcf507fbd68f3276c00f6c02ef155ad69f79b"},{"fixed":"fabfa6b81bd386154d7e59f8cd8f760f9e68b48c"},{"fixed":"b328d8e7c437d0f026ba2c13788af6eae77700f1"},{"fixed":"6575f9fbf084502b7118a628425bf7866666498d"},{"fixed":"911b557dd7817460881fd51a03069b539c674d0e"},{"fixed":"e384a850a3370d89a7a446cdeccd964bfba2a302"},{"fixed":"10fb72c47aac446f12a4ccd962c7daa60cc890a1"},{"fixed":"41c6e9bc3a09539deab43957a3211d902a4818f0"},{"fixed":"4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31596.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.29"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.136"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.83"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.20.0"},{"fixed":"7.0.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31596.json"}}],"schema_version":"1.7.5"}