drbd: add missing kref_get in handle_write_conflicts

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Summary

CVECVE-2025-38708
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-04 16:15:39 UTC
Updated2026-05-12 13:17:01 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 0336bfe9c237476bd7c45605a36ca79c2bca62e5 git Not specified
CNA Linux Linux affected 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 810cd546a29bfac90ed1328ea01d693d4bd11cb1 git Not specified
CNA Linux Linux affected 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 84ef8dd3238330d1795745ece83b19f0295751bf git Not specified
CNA Linux Linux affected 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 57418de35420cedab035aa1da8a26c0499b7f575 git Not specified
CNA Linux Linux affected 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 9f53b2433ad248cd3342cc345f56f5c7904bd8c4 git Not specified
CNA Linux Linux affected 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 7d483ad300fc0a06f69b019dda8f74970714baf8 git Not specified
CNA Linux Linux affected 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 46e3763dcae0ffcf8fcfaff4fc10a90a92ffdd89 git Not specified
CNA Linux Linux affected 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 3a896498f6f577e57bf26aaa93b48c22b6d20c20 git Not specified
CNA Linux Linux affected 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 00c9c9628b49e368d140cfa61d7df9b8922ec2a8 git Not specified
CNA Linux Linux affected 4.5 Not specified
CNA Linux Linux unaffected 4.5 semver Not specified
CNA Linux Linux unaffected 5.4.297 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.241 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.190 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.149 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.103 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.43 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.11 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16.2 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0336bfe9c237476bd7c45605a36ca79c2bca62e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/810cd546a29bfac90ed1328ea01d693d4bd11cb1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-082556.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/7d483ad300fc0a06f69b019dda8f74970714baf8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/00c9c9628b49e368d140cfa61d7df9b8922ec2a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/57418de35420cedab035aa1da8a26c0499b7f575 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/46e3763dcae0ffcf8fcfaff4fc10a90a92ffdd89 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/3a896498f6f577e57bf26aaa93b48c22b6d20c20 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9f53b2433ad248cd3342cc345f56f5c7904bd8c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/84ef8dd3238330d1795745ece83b19f0295751bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
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