{"id":"CVE-2025-38230","summary":"jfs: validate AG parameters in dbMount() to prevent crashes","details":"In the Linux kernel, the following vulnerability has been resolved:\n\njfs: validate AG parameters in dbMount() to prevent crashes\n\nValidate db_agheight, db_agwidth, and db_agstart in dbMount to catch\ncorrupted metadata early and avoid undefined behavior in dbAllocAG.\nLimits are derived from L2LPERCTL, LPERCTL/MAXAG, and CTLTREESIZE:\n\n- agheight: 0 to L2LPERCTL/2 (0 to 5) ensures shift\n  (L2LPERCTL - 2*agheight) \u003e= 0.\n- agwidth: 1 to min(LPERCTL/MAXAG, 2^(L2LPERCTL - 2*agheight))\n  ensures agperlev \u003e= 1.\n  - Ranges: 1-8 (agheight 0-3), 1-4 (agheight 4), 1 (agheight 5).\n  - LPERCTL/MAXAG = 1024/128 = 8 limits leaves per AG;\n    2^(10 - 2*agheight) prevents division to 0.\n- agstart: 0 to CTLTREESIZE-1 - agwidth*(MAXAG-1) keeps ti within\n  stree (size 1365).\n  - Ranges: 0-1237 (agwidth 1), 0-348 (agwidth 8).\n\nUBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1400:9\nshift exponent -335544310 is negative\nCPU: 0 UID: 0 PID: 5822 Comm: syz-executor130 Not tainted 6.14.0-rc5-syzkaller #0\nHardware name: Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n ubsan_epilogue lib/ubsan.c:231 [inline]\n __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468\n dbAllocAG+0x1087/0x10b0 fs/jfs/jfs_dmap.c:1400\n dbDiscardAG+0x352/0xa20 fs/jfs/jfs_dmap.c:1613\n jfs_ioc_trim+0x45a/0x6b0 fs/jfs/jfs_discard.c:105\n jfs_ioctl+0x2cd/0x3e0 fs/jfs/ioctl.c:131\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.","modified":"2026-05-07T04:17:26.169593Z","published":"2025-07-04T13:37:44.264Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38230.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0c40fa81f850556e9aa0185fede9ef1112db7b39"},{"type":"WEB","url":"https://git.kernel.org/stable/c/37bfb464ddca87f203071b5bd562cd91ddc0b40a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8b69608c6b6779a7ab07ce4467a56df90152cfb9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9242ff6245527a3ebb693ddd175493b38ddca72f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/95ae5ee6069d9a5945772625f289422ef659221a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a4259e72363e1ea204a97292001a9fc36c7e52fd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b62a1e59d8716bbd2e73660743fe06acc97ed7d1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c3705c82b7406a15ef38a610d03bf6baa43d6e0c"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38230.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38230"},{"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":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"95ae5ee6069d9a5945772625f289422ef659221a"},{"fixed":"a4259e72363e1ea204a97292001a9fc36c7e52fd"},{"fixed":"c3705c82b7406a15ef38a610d03bf6baa43d6e0c"},{"fixed":"9242ff6245527a3ebb693ddd175493b38ddca72f"},{"fixed":"0c40fa81f850556e9aa0185fede9ef1112db7b39"},{"fixed":"8b69608c6b6779a7ab07ce4467a56df90152cfb9"},{"fixed":"b62a1e59d8716bbd2e73660743fe06acc97ed7d1"},{"fixed":"37bfb464ddca87f203071b5bd562cd91ddc0b40a"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38230.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.12"},{"fixed":"5.4.296"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.240"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.187"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.15.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38230.json"}}],"schema_version":"1.7.5"}