CVE-2025-38480 Affecting kernel-uek-debug-modules package, versions <0:6.12.0-103.40.4.1.el9uek
Threat Intelligence
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Test your applications- Snyk IDSNYK-ORACLE9-KERNELUEKDEBUGMODULES-12575971
- published10 Sept 2025
- disclosed28 Jul 2025
Introduced: 28 Jul 2025
CVE-2025-38480 (opens in a new tab)How to fix?
Upgrade Oracle:9 kernel-uek-debug-modules to version 0:6.12.0-103.40.4.1.el9uek or higher.
This issue was patched in ELSA-2025-20551.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-uek-debug-modules package and not the kernel-uek-debug-modules package as distributed by Oracle.
See How to fix? for Oracle:9 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
comedi: Fix use of uninitialized data in insn_rw_emulate_bits()
For Comedi INSN_READ and INSN_WRITE instructions on "digital"
subdevices (subdevice types COMEDI_SUBD_DI, COMEDI_SUBD_DO, and
COMEDI_SUBD_DIO), it is common for the subdevice driver not to have
insn_read and insn_write handler functions, but to have an
insn_bits handler function for handling Comedi INSN_BITS
instructions. In that case, the subdevice's insn_read and/or
insn_write function handler pointers are set to point to the
insn_rw_emulate_bits() function by __comedi_device_postconfig().
For INSN_WRITE, insn_rw_emulate_bits() currently assumes that the
supplied data[0] value is a valid copy from user memory. It will at
least exist because do_insnlist_ioctl() and do_insn_ioctl() in
"comedi_fops.c" ensure at lease MIN_SAMPLES (16) elements are
allocated. However, if insn->n is 0 (which is allowable for
INSN_READ and INSN_WRITE instructions, then data[0] may contain
uninitialized data, and certainly contains invalid data, possibly from a
different instruction in the array of instructions handled by
do_insnlist_ioctl(). This will result in an incorrect value being
written to the digital output channel (or to the digital input/output
channel if configured as an output), and may be reflected in the
internal saved state of the channel.
Fix it by returning 0 early if insn->n is 0, before reaching the code
that accesses data[0]. Previously, the function always returned 1 on
success, but it is supposed to be the number of data samples actually
read or written up to insn->n, which is 0 in this case.
References
- https://linux.oracle.com/cve/CVE-2025-38480.html
- https://linux.oracle.com/errata/ELSA-2025-20551.html
- https://git.kernel.org/stable/c/10f9024a8c824a41827fff1fefefb314c98e2c88
- https://git.kernel.org/stable/c/2af1e7d389c2619219171d23f5b96dbcbb7f9656
- https://git.kernel.org/stable/c/3050d197d6bc9ef128944a70210f42d2430b3000
- https://git.kernel.org/stable/c/3ab55ffaaf75d0c7b68e332c1cdcc1b0e0044870
- https://git.kernel.org/stable/c/e9cb26291d009243a4478a7ffb37b3a9175bfce9
- https://git.kernel.org/stable/c/16256d7efcf7acc9f39abe21522c4c6b77f67c00
- https://git.kernel.org/stable/c/4c2981bf30401adfcdbfece4ab6f411f7c5875a1
- https://git.kernel.org/stable/c/c53570e62b5b28bdb56bb563190227f8307817a5