CVE-2026-98660: iio: pressure: bmp280: fix out-of-bounds access in sampling frequency lookup

CVE-2026-98660: iio: pressure: bmp280: fix out-of-bounds access in sampling frequency lookup

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

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

iio: pressure: bmp280: fix out-of-bounds access in sampling frequency lookup

The sampling frequency tables store each frequency as an integer part and
a fractional part in micro units. num_sampling_freq_avail is initialized
to the number of flattened integer elements because read_avail() returns
the table as a flat array.

bmp280_write_sampling_frequency(), however, indexes the same table as a
two-dimensional array and uses num_sampling_freq_avail as the number of
rows. Convert the flattened element count back to the number of rows
before iterating over the table.

The Linux kernel CVE team has assigned CVE-2026-98660 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.1 with commit 10b40ffba2f95cdeed47b731c5ad5ecc73e140e8 and fixed in 6.12.113 with commit 9db6684fab228edd3b8861a172ccbce3236f027a
	Issue introduced in 6.1 with commit 10b40ffba2f95cdeed47b731c5ad5ecc73e140e8 and fixed in 6.18.56 with commit 4fd5a61e61d6899cbd45728a5fceba49a53c222d
	Issue introduced in 6.1 with commit 10b40ffba2f95cdeed47b731c5ad5ecc73e140e8 and fixed in 7.2.10 with commit 7dbb518f3328ebd9d5c6e970b4befad6deb5c7f1
	Issue introduced in 6.1 with commit 10b40ffba2f95cdeed47b731c5ad5ecc73e140e8 and fixed in 7.3-rc6 with commit 56c423b233b214182c58c99861899327b45b0d6c

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-98660
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/iio/pressure/bmp280-core.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/9db6684fab228edd3b8861a172ccbce3236f027a
	https://git.kernel.org/stable/c/4fd5a61e61d6899cbd45728a5fceba49a53c222d
	https://git.kernel.org/stable/c/7dbb518f3328ebd9d5c6e970b4befad6deb5c7f1
	https://git.kernel.org/stable/c/56c423b233b214182c58c99861899327b45b0d6c