CVE-2025-38230— jfs: validate AG parameters in dbMount() to prevent crashes
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I. Basic Information for CVE-2025-38230
Vulnerability Information
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Vulnerability Title
jfs: validate AG parameters in dbMount() to prevent crashes
Source: NVD (National Vulnerability Database)
Vulnerability 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: <TASK> __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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于jfs未验证dbMount中的AG参数，可能导致越界移位操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-38230
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Same Patch Batch · Linux · 2025-07-04 · 59 CVEs total
| CVE-2025-38215 | fbdev: Fix do_register_framebuffer to prevent null-ptr-deref in fb_videomode_to_var | |
| CVE-2025-38227 | media: vidtv: Terminating the subsequent process of initialization failure | |
| CVE-2025-38231 | nfsd: Initialize ssc before laundromat_work to prevent NULL dereference | |
| CVE-2025-38228 | media: imagination: fix a potential memory leak in e5010_probe() | |
| CVE-2025-38229 | media: cxusb: no longer judge rbuf when the write fails | |
| CVE-2025-38233 | powerpc64/ftrace: fix clobbered r15 during livepatching | |
| CVE-2025-38219 | f2fs: prevent kernel warning due to negative i_nlink from corrupted image | |
| CVE-2025-38218 | f2fs: fix to do sanity check on sit_bitmap_size | |
| CVE-2025-38217 | hwmon: (ftsteutates) Fix TOCTOU race in fts_read() | |
| CVE-2025-38216 | iommu/vt-d: Restore context entry setup order for aliased devices | |
| CVE-2025-38221 | ext4: fix out of bounds punch offset | |
| CVE-2025-38214 | fbdev: Fix fb_set_var to prevent null-ptr-deref in fb_videomode_to_var | |
| CVE-2025-38212 | ipc: fix to protect IPCS lookups using RCU | |
| CVE-2025-38211 | RDMA/iwcm: Fix use-after-free of work objects after cm_id destruction | |
| CVE-2025-38210 | configfs-tsm-report: Fix NULL dereference of tsm_ops | |
| CVE-2025-38209 | nvme-tcp: remove tag set when second admin queue config fails | |
| CVE-2025-38208 | smb: client: add NULL check in automount_fullpath | |
| CVE-2025-38207 | mm: fix uprobe pte be overwritten when expanding vma | |
| CVE-2025-38206 | exfat: fix double free in delayed_free | |
| CVE-2025-38205 | drm/amd/display: Avoid divide by zero by initializing dummy pitch to 1 |
Showing top 20 of 59 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-38230
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