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CVE-2025-38708— drbd: add missing kref_get in handle_write_conflicts

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DRBD未正确增加引用计数。

CVSS 9.8 · Critical EPSS 0.38% · P31

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6< 0336bfe9c237476bd7c45605a36ca79c2bca62e5 affected
668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6< 810cd546a29bfac90ed1328ea01d693d4bd11cb1 affected
668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6< 84ef8dd3238330d1795745ece83b19f0295751bf affected
668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6< 57418de35420cedab035aa1da8a26c0499b7f575 affected
668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6< 9f53b2433ad248cd3342cc345f56f5c7904bd8c4 affected
668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6< 7d483ad300fc0a06f69b019dda8f74970714baf8 affected
668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6< 46e3763dcae0ffcf8fcfaff4fc10a90a92ffdd89 affected
668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6< 3a896498f6f577e57bf26aaa93b48c22b6d20c20 affected
… +12 more rows
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I. Basic Information for CVE-2025-38708

Vulnerability Information
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Vulnerability Title
drbd: add missing kref_get in handle_write_conflicts
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drbd: add missing kref_get in handle_write_conflicts With `two-primaries` enabled, DRBD tries to detect "concurrent" writes and handle write conflicts, so that even if you write to the same sector simultaneously on both nodes, they end up with the identical data once the writes are completed. In handling "superseeded" writes, we forgot a kref_get, resulting in a premature drbd_destroy_device and use after free, and further to kernel crashes with symptoms. Relevance: No one should use DRBD as a random data generator, and apparently all users of "two-primaries" handle concurrent writes correctly on layer up. That is cluster file systems use some distributed lock manager, and live migration in virtualization environments stops writes on one node before starting writes on the other node. Which means that other than for "test cases", this code path is never taken in real life. FYI, in DRBD 9, things are handled differently nowadays. We still detect "write conflicts", but no longer try to be smart about them. We decided to disconnect hard instead: upper layers must not submit concurrent writes. If they do, that's their fault.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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DRBD未正确增加引用计数。
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 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 ~ 0336bfe9c237476bd7c45605a36ca79c2bca62e5 -
Linux Linux 4.5 -

II. Public POCs for CVE-2025-38708

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III. Intelligence Information for CVE-2025-38708

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Same Patch Batch · Linux · 2025-09-04 · 52 CVEs total

CVE-2025-38724 9.8 CRITICAL nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()
CVE-2025-38728 9.1 CRITICAL smb3: fix for slab out of bounds on mount to ksmbd
CVE-2025-38688 8.8 HIGH iommufd: Prevent ALIGN() overflow
CVE-2025-38697 7.8 HIGH jfs: upper bound check of tree index in dbAllocAG
CVE-2025-38722 7.8 HIGH habanalabs: fix UAF in export_dmabuf()
CVE-2025-38685 7.8 HIGH fbdev: Fix vmalloc out-of-bounds write in fast_imageblit
CVE-2025-38718 7.8 HIGH sctp: linearize cloned gso packets in sctp_rcv
CVE-2025-38717 7.8 HIGH net: kcm: Fix race condition in kcm_unattach()
CVE-2025-38715 7.8 HIGH hfs: fix slab-out-of-bounds in hfs_bnode_read()
CVE-2025-38710 7.8 HIGH gfs2: Validate i_depth for exhash directories
CVE-2025-38730 7.8 HIGH io_uring/net: commit partial buffers on retry
CVE-2025-38703 7.8 HIGH drm/xe: Make dma-fences compliant with the safe access rules
CVE-2025-38714 7.8 HIGH hfsplus: fix slab-out-of-bounds in hfsplus_bnode_read()
CVE-2025-38679 7.3 HIGH media: venus: Fix OOB read due to missing payload bound check
CVE-2025-38687 7.3 HIGH comedi: fix race between polling and detaching
CVE-2025-38713 7.1 HIGH hfsplus: fix slab-out-of-bounds read in hfsplus_uni2asc()
CVE-2025-38707 7.1 HIGH fs/ntfs3: Add sanity check for file name
CVE-2025-38680 media: uvcvideo: Fix 1-byte out-of-bounds read in uvc_parse_format()
CVE-2025-38693 media: dvb-frontends: w7090p: fix null-ptr-deref in w7090p_tuner_write_serpar and w7090p_t
CVE-2025-38681 mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd()

Showing top 20 of 52 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38708

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