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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2025-38230

jfs: validate AG parameters in dbMount() to prevent crashes

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 95ae5ee6069d9a5945772625f289422ef659221aaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < a4259e72363e1ea204a97292001a9fc36c7e52fdaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c3705c82b7406a15ef38a610d03bf6baa43d6e0caffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 9242ff6245527a3ebb693ddd175493b38ddca72faffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 0c40fa81f850556e9aa0185fede9ef1112db7b39affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 8b69608c6b6779a7ab07ce4467a56df90152cfb9affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b62a1e59d8716bbd2e73660743fe06acc97ed7d1affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 37bfb464ddca87f203071b5bd562cd91ddc0b40aaffected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 5.4.296 to ≤ 5.4.*unaffected
  • 5.10.240 to ≤ 5.10.*unaffected
  • 5.15.187 to ≤ 5.15.*unaffected
  • 6.1.143 to ≤ 6.1.*unaffected
  • 6.6.96 to ≤ 6.6.*unaffected
  • 6.12.36 to ≤ 6.12.*unaffected
  • 6.15.4 to ≤ 6.15.*unaffected
  • 6.16 to ≤ *unaffected

References