CVE - CVE-2025-21712

CVE-ID
CVE-2025-21712	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE 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: <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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/237e19519c8ff6949f0ef57c4a0243f5b2b0fa18 URL:https://git.kernel.org/stable/c/237e19519c8ff6949f0ef57c4a0243f5b2b0fa18 MISC:https://git.kernel.org/stable/c/4e9316eee3885bfb311b4759513f2ccf37891c09 URL:https://git.kernel.org/stable/c/4e9316eee3885bfb311b4759513f2ccf37891c09 MISC:https://git.kernel.org/stable/c/52848a095b55a302af92f52ca0de5b3112059bb8 URL:https://git.kernel.org/stable/c/52848a095b55a302af92f52ca0de5b3112059bb8 MISC:https://git.kernel.org/stable/c/8d28d0ddb986f56920ac97ae704cc3340a699a30 URL:https://git.kernel.org/stable/c/8d28d0ddb986f56920ac97ae704cc3340a699a30
Assigning CNA
kernel.org
Date Record Created
20241229	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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