High 7.8Published Feb 26, 2025

CVE-2025-21712md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime

Updated under an hour ago (Oct 28, 2026, 3:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 32a7627cf3a35396a8e834faf34e38ae9f3b1309 before eb2f9d98cd3e94a79fbf8fb90637c5b12e805428; from 32a7627cf3a35396a8e834faf34e38ae9f3b1309 before 032fa54f486eac5507976e7e31f079a767bc13a8; from 32a7627cf3a35396a8e834faf34e38ae9f3b1309 before 52848a095b55a302af92f52ca0de5b3112059bb8; from 32a7627cf3a35396a8e834faf34e38ae9f3b1309 before 237e19519c8ff6949f0ef57c4a0243f5b2b0fa18; 32a7627cf3a35396a8e834faf34e38ae9f3b1309 builds before 4e9316eee3885bfb311b4759513f2ccf37891c09; 32a7627cf3a35396a8e834faf34e38ae9f3b1309 builds before 8d28d0ddb986f56920ac97ae704cc3340a699a30	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.13 before 6.1.130; from 6.2 before 6.6.80; from 6.7 before 6.12.13; from 6.13 before 6.13.2	NVD

References

References

https://git.kernel.org/stable/c/eb2f9d98cd3e94a79fbf8fb90637c5b12e805428
https://git.kernel.org/stable/c/032fa54f486eac5507976e7e31f079a767bc13a8	patch
https://git.kernel.org/stable/c/52848a095b55a302af92f52ca0de5b3112059bb8	patch
https://git.kernel.org/stable/c/237e19519c8ff6949f0ef57c4a0243f5b2b0fa18	patch
https://git.kernel.org/stable/c/4e9316eee3885bfb311b4759513f2ccf37891c09	patch
https://git.kernel.org/stable/c/8d28d0ddb986f56920ac97ae704cc3340a699a30	patch
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.