CVE-2025-21712 Information

Description

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: 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.

Reference

https://git.kernel.org/stable/c/237e19519c8ff6949f0ef57c4a0243f5b2b0fa18 https://git.kernel.org/stable/c/4e9316eee3885bfb311b4759513f2ccf37891c09 https://git.kernel.org/stable/c/52848a095b55a302af92f52ca0de5b3112059bb8 https://git.kernel.org/stable/c/8d28d0ddb986f56920ac97ae704cc3340a699a30