# CVE-2025-38230: jfs: validate AG parameters in dbMount() to prevent crashes CVE-2025-38230 is fixed in 9 products on 1 platform, first by DEBIAN-CVE-2025-38230, released July 4, 2025. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2025-38230 - Priority: High - CVSS: 7.8 (high) - EPSS: 0.0020 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 4, 2025 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38230 ## Description In the Linux kernel, the following vulnerability has been resolved: jfs: validate AG parameters in dbMount() to prevent crashes Validate db_agheight, db_agwidth, and db_agstart in dbMount to catch corrupted metadata early and avoid undefined behavior in dbAllocAG. Limits are derived from L2LPERCTL, LPERCTL/MAXAG, and CTLTREESIZE: - agheight: 0 to L2LPERCTL/2 (0 to 5) ensures shift (L2LPERCTL - 2*agheight) >= 0. - agwidth: 1 to min(LPERCTL/MAXAG, 2^(L2LPERCTL - 2*agheight)) ensures agperlev >= 1. - Ranges: 1-8 (agheight 0-3), 1-4 (agheight 4), 1 (agheight 5). - LPERCTL/MAXAG = 1024/128 = 8 limits leaves per AG; 2^(10 - 2*agheight) prevents division to 0. - agstart: 0 to CTLTREESIZE-1 - agwidth*(MAXAG-1) keeps ti within stree (size 1365). - Ranges: 0-1237 (agwidth 1), 0-348 (agwidth 8). UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1400:9 shift exponent -335544310 is negative CPU: 0 UID: 0 PID: 5822 Comm: syz-executor130 Not tainted 6.14.0-rc5-syzkaller #0 Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 dbAllocAG+0x1087/0x10b0 fs/jfs/jfs_dmap.c:1400 dbDiscardAG+0x352/0xa20 fs/jfs/jfs_dmap.c:1613 jfs_ioc_trim+0x45a/0x6b0 fs/jfs/jfs_discard.c:105 jfs_ioctl+0x2cd/0x3e0 fs/jfs/ioctl.c:131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Found by Linux Verification Center (linuxtesting.org) with Syzkaller. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | kernel-uek ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 | | Linux | kernel-uek-container ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 | | Linux | kernel-uek-container-debug ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 | | Linux | kernel-uek-debug ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 | | Linux | kernel-uek-debug-devel ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 | | Linux | kernel-uek-devel ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 | | Linux | kernel-uek-doc ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 | | Linux | kernel-uek-tools ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 | | Linux | linux Debian 12.15 (bookworm) | 6.1.147-1 | [DEBIAN-CVE-2025-38230](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38230.md) | Jul 4, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.12.37-1 | [DEBIAN-CVE-2025-38230](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38230.md) | Jul 4, 2025 | | Linux | linux Debian 14 | 6.12.37-1 | [DEBIAN-CVE-2025-38230](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38230.md) | Jul 4, 2025 | --- Data as of 2026-11-09T01:18:40Z UTC. 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