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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2025-38708

drbd: add missing kref_get in handle_write_conflicts

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 to < 0336bfe9c237476bd7c45605a36ca79c2bca62e5affected
  • 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 to < 810cd546a29bfac90ed1328ea01d693d4bd11cb1affected
  • 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 to < 84ef8dd3238330d1795745ece83b19f0295751bfaffected
  • 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 to < 57418de35420cedab035aa1da8a26c0499b7f575affected
  • 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 to < 9f53b2433ad248cd3342cc345f56f5c7904bd8c4affected
  • 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 to < 7d483ad300fc0a06f69b019dda8f74970714baf8affected
  • 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 to < 46e3763dcae0ffcf8fcfaff4fc10a90a92ffdd89affected
  • 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 to < 3a896498f6f577e57bf26aaa93b48c22b6d20c20affected
  • 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 to < 00c9c9628b49e368d140cfa61d7df9b8922ec2a8affected

Linux Linux

Default version status: affected

  • 4.5affected
  • 0 to < 4.5unaffected
  • 5.4.297 to ≤ 5.4.*unaffected
  • 5.10.241 to ≤ 5.10.*unaffected
  • 5.15.190 to ≤ 5.15.*unaffected
  • 6.1.149 to ≤ 6.1.*unaffected
  • 6.6.103 to ≤ 6.6.*unaffected
  • 6.12.43 to ≤ 6.12.*unaffected
  • 6.15.11 to ≤ 6.15.*unaffected
  • 6.16.2 to ≤ 6.16.*unaffected
  • 6.17 to ≤ *unaffected

References