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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于md_bitmap_get_stats与bitmap生命周期不同步。

CVSS 7.8 · High EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 32a7627cf3a35396a8e834faf34e38ae9f3b1309< eb2f9d98cd3e94a79fbf8fb90637c5b12e805428 affected
32a7627cf3a35396a8e834faf34e38ae9f3b1309< 032fa54f486eac5507976e7e31f079a767bc13a8 affected
32a7627cf3a35396a8e834faf34e38ae9f3b1309< 52848a095b55a302af92f52ca0de5b3112059bb8 affected
32a7627cf3a35396a8e834faf34e38ae9f3b1309< 237e19519c8ff6949f0ef57c4a0243f5b2b0fa18 affected
32a7627cf3a35396a8e834faf34e38ae9f3b1309< 4e9316eee3885bfb311b4759513f2ccf37891c09 affected
32a7627cf3a35396a8e834faf34e38ae9f3b1309< 8d28d0ddb986f56920ac97ae704cc3340a699a30 affected
2.6.13 affected
< 2.6.13 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-21712

Vulnerability Information
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Vulnerability Title
md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于md_bitmap_get_stats与bitmap生命周期不同步。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 32a7627cf3a35396a8e834faf34e38ae9f3b1309 ~ eb2f9d98cd3e94a79fbf8fb90637c5b12e805428 -
Linux Linux 2.6.13 -

II. Public POCs for CVE-2025-21712

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III. Intelligence Information for CVE-2025-21712

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Patches & Fixes for CVE-2025-21712 (6)

Same Patch Batch · Linux · 2025-02-27 · 177 CVEs total

CVE-2025-21748 9.8 CRITICAL ksmbd: fix integer overflows on 32 bit systems
CVE-2025-21707 9.8 CRITICAL mptcp: consolidate suboption status
CVE-2025-21796 9.8 CRITICAL nfsd: clear acl_access/acl_default after releasing them
CVE-2025-21805 9.8 CRITICAL RDMA/rtrs: Add missing deinit() call
CVE-2024-58006 9.6 CRITICAL PCI: dwc: ep: Prevent changing BAR size/flags in pci_epc_set_bar()
CVE-2024-57999 8.8 HIGH powerpc/pseries/iommu: IOMMU incorrectly marks MMIO range in DDW
CVE-2024-57997 8.8 HIGH wifi: wcn36xx: fix channel survey memory allocation size
CVE-2024-57995 8.8 HIGH wifi: ath12k: fix read pointer after free in ath12k_mac_assign_vif_to_vdev()
CVE-2025-21735 8.8 HIGH NFC: nci: Add bounds checking in nci_hci_create_pipe()
CVE-2025-21710 8.2 HIGH tcp: correct handling of extreme memory squeeze
CVE-2024-57973 8.1 HIGH rdma/cxgb4: Prevent potential integer overflow on 32bit
CVE-2025-21760 8.1 HIGH ndisc: extend RCU protection in ndisc_send_skb()
CVE-2025-21762 8.1 HIGH arp: use RCU protection in arp_xmit()
CVE-2025-21765 8.1 HIGH ipv6: use RCU protection in ip6_default_advmss()
CVE-2025-21766 8.1 HIGH ipv4: use RCU protection in __ip_rt_update_pmtu()
CVE-2025-21801 7.8 HIGH net: ravb: Fix missing rtnl lock in suspend/resume path
CVE-2025-21722 7.8 HIGH nilfs2: do not force clear folio if buffer is referenced
CVE-2024-58003 7.8 HIGH media: i2c: ds90ub9x3: Fix extra fwnode_handle_put()
CVE-2024-58034 7.8 HIGH memory: tegra20-emc: fix an OF node reference bug in tegra_emc_find_node_by_ram_code()
CVE-2024-54458 7.8 HIGH scsi: ufs: bsg: Set bsg_queue to NULL after removal

Showing top 20 of 177 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux