CVE-2025-39686 Affecting dlm-kmp-default package, versions <6.4.0-150600.23.73.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.04% (10th percentile)

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  • Snyk IDSNYK-SLES156-DLMKMPDEFAULT-13581268
  • published16 Oct 2025
  • disclosed15 Oct 2025

Introduced: 15 Oct 2025

NewCVE-2025-39686  (opens in a new tab)

How to fix?

Upgrade SLES:15.6 dlm-kmp-default to version 6.4.0-150600.23.73.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream dlm-kmp-default package and not the dlm-kmp-default package as distributed by SLES. See How to fix? for SLES:15.6 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

comedi: Make insn_rw_emulate_bits() do insn->n samples

The insn_rw_emulate_bits() function is used as a default handler for INSN_READ instructions for subdevices that have a handler for INSN_BITS but not for INSN_READ. Similarly, it is used as a default handler for INSN_WRITE instructions for subdevices that have a handler for INSN_BITS but not for INSN_WRITE. It works by emulating the INSN_READ or INSN_WRITE instruction handling with a constructed INSN_BITS instruction. However, INSN_READ and INSN_WRITE instructions are supposed to be able read or write multiple samples, indicated by the insn-&gt;n value, but insn_rw_emulate_bits() currently only handles a single sample. For INSN_READ, the comedi core will copy insn-&gt;n samples back to user-space. (That triggered KASAN kernel-infoleak errors when insn-&gt;n was greater than 1, but that is being fixed more generally elsewhere in the comedi core.)

Make insn_rw_emulate_bits() either handle insn-&gt;n samples, or return an error, to conform to the general expectation for INSN_READ and INSN_WRITE handlers.

CVSS Base Scores

version 3.1