Answer in brief
CVE-2025-21712 records a High severity (CVSS 7.8) vulnerability in md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=32a7627cf3a35396a8e834faf34e38ae9f3b1309 <eb2f9d98cd3e94a79fbf8fb90637c5b12e805428 || >=32a7627cf3a35396a8e834faf34e38ae9f3b1309 <032fa54f486eac5507976e7e31f079a767bc13a8 || >=32a7627cf3a35396a8e834faf34e38ae9f3b1309 <52848a095b55a302af92f52ca0de5b3112059bb8 || >=32a7627cf3a35396a8e834faf34e38ae9f3b1309 <237e19519c8ff6949f0ef57c4a0243f5b2b0fa18 || >=32a7627cf3a35396a8e834faf34e38ae9f3b1309 <4e9316eee3885bfb311b4759513f2ccf37891c09 || >=32a7627cf3a35396a8e834faf34e38ae9f3b1309 <8d28d0ddb986f56920ac97ae704cc3340a699a30 | eb2f9d98cd3e94a79fbf8fb90637c5b12e805428, 032fa54f486eac5507976e7e31f079a767bc13a8, 52848a095b55a302af92f52ca0de5b3112059bb8, 237e19519c8ff6949f0ef57c4a0243f5b2b0fa18, 4e9316eee3885bfb311b4759513f2ccf37891c09, 8d28d0ddb986f56920ac97ae704cc3340a699a30 |
| Linux/Linuxgeneric | 2.6.13 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Feb 27, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.