{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53040",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-53040"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "ocfs2: validate bg_bits during freefrag scan",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate bg_bits during freefrag scan\n\n[BUG]\nA crafted filesystem can trigger an out-of-bounds bitmap walk when\nOCFS2_IOC_INFO is issued with OCFS2_INFO_FL_NON_COHERENT.\n\nBUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]\nBUG: KASAN: use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]\nBUG: KASAN: use-after-free in test_bit_le include/asm-generic/bitops/le.h:21 [inline]\nBUG: KASAN: use-after-free in ocfs2_info_freefrag_scan_chain fs/ocfs2/ioctl.c:495 [inline]\nBUG: KASAN: use-after-free in ocfs2_info_freefrag_scan_bitmap fs/ocfs2/ioctl.c:588 [inline]\nBUG: KASAN: use-after-free in ocfs2_info_handle_freefrag fs/ocfs2/ioctl.c:662 [inline]\nBUG: KASAN: use-after-free in ocfs2_info_handle_request+0x1c66/0x3370 fs/ocfs2/ioctl.c:754\nRead of size 8 at addr ffff888031bce000 by task syz.0.636/1435\nCall Trace:\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0xbe/0x130 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xd1/0x650 mm/kasan/report.c:482\n kasan_report+0xfb/0x140 mm/kasan/report.c:595\n check_region_inline mm/kasan/generic.c:186 [inline]\n kasan_check_range+0x11c/0x200 mm/kasan/generic.c:200\n __kasan_check_read+0x11/0x20 mm/kasan/shadow.c:31\n instrument_atomic_read include/linux/instrumented.h:68 [inline]\n _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]\n test_bit_le include/asm-generic/bitops/le.h:21 [inline]\n ocfs2_info_freefrag_scan_chain fs/ocfs2/ioctl.c:495 [inline]\n ocfs2_info_freefrag_scan_bitmap fs/ocfs2/ioctl.c:588 [inline]\n ocfs2_info_handle_freefrag fs/ocfs2/ioctl.c:662 [inline]\n ocfs2_info_handle_request+0x1c66/0x3370 fs/ocfs2/ioctl.c:754\n ocfs2_info_handle+0x18d/0x2a0 fs/ocfs2/ioctl.c:828\n ocfs2_ioctl+0x632/0x6e0 fs/ocfs2/ioctl.c:913\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 ...\n\n[CAUSE]\nocfs2_info_freefrag_scan_chain() uses on-disk bg_bits directly as the\nbitmap scan limit. The coherent path reads group descriptors through\nocfs2_read_group_descriptor(), which validates the descriptor before\nuse. The non-coherent path uses ocfs2_read_blocks_sync() instead and\nskips that validation, so an impossible bg_bits value can drive the\nbitmap walk past the end of the block.\n\n[FIX]\nCompute the bitmap capacity from the filesystem format with\nocfs2_group_bitmap_size(), report descriptors whose bg_bits exceeds\nthat limit, and clamp the scan to the computed capacity. This keeps the\nfreefrag report going while avoiding reads beyond the buffer.",
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