CVE-2025-38677 (GCVE-0-2025-38677)
Vulnerability from cvelistv5
Published
2025-08-30 09:19
Modified
2025-11-03 17:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid out-of-boundary access in dnode page As Jiaming Zhang reported: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x17e/0x800 mm/kasan/report.c:480 kasan_report+0x147/0x180 mm/kasan/report.c:593 data_blkaddr fs/f2fs/f2fs.h:3053 [inline] f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline] f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855 f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195 prepare_write_begin fs/f2fs/data.c:3395 [inline] f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline] f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x546/0xa90 fs/read_write.c:686 ksys_write+0x149/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The root cause is in the corrupted image, there is a dnode has the same node id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to access block address in dnode at offset 934, however it parses the dnode as inode node, so that get_dnode_addr() returns 360, then it tries to access page address from 360 + 934 * 4 = 4096 w/ 4 bytes. To fix this issue, let's add sanity check for node id of all direct nodes during f2fs_get_dnode_of_data().
References
Impacted products
Vendor Product Version
Linux Linux Version: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4
Version: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4
Version: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4
Version: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4
Version: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4
Version: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4
Version: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4
Version: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid out-of-boundary access in dnode page\n\nAs Jiaming Zhang reported:\n\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0x17e/0x800 mm/kasan/report.c:480\n kasan_report+0x147/0x180 mm/kasan/report.c:593\n data_blkaddr fs/f2fs/f2fs.h:3053 [inline]\n f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline]\n f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855\n f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195\n prepare_write_begin fs/f2fs/data.c:3395 [inline]\n f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594\n generic_perform_write+0x2c7/0x910 mm/filemap.c:4112\n f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline]\n f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0x546/0xa90 fs/read_write.c:686\n ksys_write+0x149/0x250 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe root cause is in the corrupted image, there is a dnode has the same\nnode id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to\naccess block address in dnode at offset 934, however it parses the dnode\nas inode node, so that get_dnode_addr() returns 360, then it tries to\naccess page address from 360 + 934 * 4 = 4096 w/ 4 bytes.\n\nTo fix this issue, let\u0027s add sanity check for node id of all direct nodes\nduring f2fs_get_dnode_of_data()."
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    "cveId": "CVE-2025-38677",
    "datePublished": "2025-08-30T09:19:02.596Z",
    "dateReserved": "2025-04-16T04:51:24.031Z",
    "dateUpdated": "2025-11-03T17:41:02.759Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38677\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-30T10:15:36.260\",\"lastModified\":\"2025-11-03T18:16:34.257\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: fix to avoid out-of-boundary access in dnode page\\n\\nAs Jiaming Zhang reported:\\n\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:94 [inline]\\n dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120\\n print_address_description mm/kasan/report.c:378 [inline]\\n print_report+0x17e/0x800 mm/kasan/report.c:480\\n kasan_report+0x147/0x180 mm/kasan/report.c:593\\n data_blkaddr fs/f2fs/f2fs.h:3053 [inline]\\n f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline]\\n f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855\\n f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195\\n prepare_write_begin fs/f2fs/data.c:3395 [inline]\\n f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594\\n generic_perform_write+0x2c7/0x910 mm/filemap.c:4112\\n f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline]\\n f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216\\n new_sync_write fs/read_write.c:593 [inline]\\n vfs_write+0x546/0xa90 fs/read_write.c:686\\n ksys_write+0x149/0x250 fs/read_write.c:738\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\nThe root cause is in the corrupted image, there is a dnode has the same\\nnode id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to\\naccess block address in dnode at offset 934, however it parses the dnode\\nas inode node, so that get_dnode_addr() returns 360, then it tries to\\naccess page address from 360 + 934 * 4 = 4096 w/ 4 bytes.\\n\\nTo fix this issue, let\u0027s add sanity check for node id of all direct nodes\\nduring f2fs_get_dnode_of_data().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6b7784ea07e6aa044f74b39d6b5af5e28746fc81\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/77de19b6867f2740cdcb6c9c7e50d522b47847a4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/888aa660144bcb6ec07839da756ee46bfcf7fc53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/901f62efd6e855f93d8b1175540f29f4dc45ba55\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92ef491b506a0f4dd971a3a76f86f2d8f5370180\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a650654365c57407413e9b1f6ff4d539bf2e99ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee4d13f5407cbdf1216cc258f45492075713889a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1d5093d9fe9f3c74c123741c88666cc853b79c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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