FKIE_CVE-2025-38708

Vulnerability from fkie_nvd - Published: 2025-09-04 16:15 - Updated: 2026-05-12 13:17
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/00c9c9628b49e368d140cfa61d7df9b8922ec2a8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0336bfe9c237476bd7c45605a36ca79c2bca62e5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a896498f6f577e57bf26aaa93b48c22b6d20c20Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/46e3763dcae0ffcf8fcfaff4fc10a90a92ffdd89Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57418de35420cedab035aa1da8a26c0499b7f575Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d483ad300fc0a06f69b019dda8f74970714baf8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/810cd546a29bfac90ed1328ea01d693d4bd11cb1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84ef8dd3238330d1795745ece83b19f0295751bfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f53b2433ad248cd3342cc345f56f5c7904bd8c4Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing List, Third Party Advisory
0b142b55-0307-4c5a-b3c9-f314f3fb7c5ehttps://cert-portal.siemens.com/productcert/html/ssa-032379.html
0b142b55-0307-4c5a-b3c9-f314f3fb7c5ehttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
debian debian_linux 11.0
To clipboard 

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrbd: add missing kref_get in handle_write_conflicts\n\nWith `two-primaries` enabled, DRBD tries to detect \"concurrent\" writes\nand handle write conflicts, so that even if you write to the same sector\nsimultaneously on both nodes, they end up with the identical data once\nthe writes are completed.\n\nIn handling \"superseeded\" writes, we forgot a kref_get,\nresulting in a premature drbd_destroy_device and use after free,\nand further to kernel crashes with symptoms.\n\nRelevance: No one should use DRBD as a random data generator, and apparently\nall users of \"two-primaries\" handle concurrent writes correctly on layer up.\nThat is cluster file systems use some distributed lock manager,\nand live migration in virtualization environments stops writes on one node\nbefore starting writes on the other node.\n\nWhich means that other than for \"test cases\",\nthis code path is never taken in real life.\n\nFYI, in DRBD 9, things are handled differently nowadays.  We still detect\n\"write conflicts\", but no longer try to be smart about them.\nWe decided to disconnect hard instead: upper layers must not submit concurrent\nwrites. If they do, that\u0027s their fault."
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  "id": "CVE-2025-38708",
  "lastModified": "2026-05-12T13:17:01.037",
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