CVE-2025-21712 (GCVE-0-2025-21712)
Vulnerability from cvelistv5
Published
2025-02-27 02:07
Modified
2026-08-05 11:53
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime After commit ec6bb299c7c3 ("md/md-bitmap: add 'sync_size' into struct md_bitmap_stats"), following panic is reported: Oops: general protection fault, probably for non-canonical address RIP: 0010:bitmap_get_stats+0x2b/0xa0 Call Trace: <TASK> md_seq_show+0x2d2/0x5b0 seq_read_iter+0x2b9/0x470 seq_read+0x12f/0x180 proc_reg_read+0x57/0xb0 vfs_read+0xf6/0x380 ksys_read+0x6c/0xf0 do_syscall_64+0x82/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e Root cause is that bitmap_get_stats() can be called at anytime if mddev is still there, even if bitmap is destroyed, or not fully initialized. Deferenceing bitmap in this case can crash the kernel. Meanwhile, the above commit start to deferencing bitmap->storage, make the problem easier to trigger. Fix the problem by protecting bitmap_get_stats() with bitmap_info.mutex.
References
Impacted products
Vendor Product Version
Linux Linux Version: 32a7627cf3a35396a8e834faf34e38ae9f3b1309
Version: 32a7627cf3a35396a8e834faf34e38ae9f3b1309
Version: 32a7627cf3a35396a8e834faf34e38ae9f3b1309
Version: 32a7627cf3a35396a8e834faf34e38ae9f3b1309
Version: 32a7627cf3a35396a8e834faf34e38ae9f3b1309
Version: 32a7627cf3a35396a8e834faf34e38ae9f3b1309
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime\n\nAfter commit ec6bb299c7c3 (\"md/md-bitmap: add \u0027sync_size\u0027 into struct\nmd_bitmap_stats\"), following panic is reported:\n\nOops: general protection fault, probably for non-canonical address\nRIP: 0010:bitmap_get_stats+0x2b/0xa0\nCall Trace:\n \u003cTASK\u003e\n md_seq_show+0x2d2/0x5b0\n seq_read_iter+0x2b9/0x470\n seq_read+0x12f/0x180\n proc_reg_read+0x57/0xb0\n vfs_read+0xf6/0x380\n ksys_read+0x6c/0xf0\n do_syscall_64+0x82/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nRoot cause is that bitmap_get_stats() can be called at anytime if mddev\nis still there, even if bitmap is destroyed, or not fully initialized.\nDeferenceing bitmap in this case can crash the kernel. Meanwhile, the\nabove commit start to deferencing bitmap-\u003estorage, make the problem\neasier to trigger.\n\nFix the problem by protecting bitmap_get_stats() with bitmap_info.mutex."
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              "value": "AV:L - The vulnerability is reached by a plain read(2) on /proc/mdstat, a local procfs file; no network or adjacent-network exposure exists. Any local process on the machine can reach bitmap_get_stats() through seq_read \u2192 md_seq_show \u2192 md_bitmap_status.\nAC:L - On an array with an external-metadata bitmap (IMSM/DDF via mdmon), storage.sb_page is permanently NULL, so a single unconditional `cat /proc/mdstat` deterministically faults \u2014 no race to win. The lifetime-race variant is likewise attacker-driven, since the attacker can spin on /proc/mdstat reads at arbitrary rate to hit the resize/load/destroy window.\nPR:L - /proc/mdstat is world-readable (S_IRUGO) with no capability check in md_seq_open() or md_seq_show(), so only an ordinary unprivileged local account is needed. The vulnerable array configuration is an environmental precondition set by the administrator or mdmon, not a privilege the attacker must hold.\nUI:N - The attacker triggers the bug entirely on its own by reading /proc/mdstat; no victim action, mount, or file open by another user is required. Existing md arrays are enumerated automatically by the seq_file iterator.\nS:U - The corruption and its consequences stay within the kernel\u0027s own security authority on the same host, with no crossing of a VM, IOMMU, or sandbox boundary. This is a standard in-kernel memory-safety defect.\nC:H - The unsynchronized access dereferences bitmap storage that concurrent __bitmap_resize()/bitmap_load()/bitmap_destroy() may have freed, kmapping a stale struct page and passing a dangling struct file to seq_file_path(), whose result is printed into the attacker-read /proc/mdstat. A groomed reallocation of the freed object turns this into a kernel-memory read primitive with the data disclosed to userspace.\nI:H - This is a use-after-free/lifetime defect on the bitmap and its storage, and a stale sb_page pointer controlled via heap reallocation is handed to kmap_local_page(), letting attacker-influenced kernel state drive subsequent memory accesses. Consistent with kernel UAF scoring, the corrupted-object dereference is treated as exploitable for control over kernel data.\nA:H - The reported and reproducible outcome is a general protection fault on a non-canonical address in bitmap_get_stats(), i.e. a kernel oops (panic with panic_on_oops), triggerable at will by any local user. Worse, the fault occurs while spin_lock(\u0026mddev-\u003elock) is held, leaking the spinlock and deadlocking all further md activity on that array."
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