CVE-2026-89952: mtd: rawnand: validate ONFI extended parameter page sections

CVE-2026-89952: mtd: rawnand: validate ONFI extended parameter page sections

[Greg Kroah-Hartman]

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

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

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

mtd: rawnand: validate ONFI extended parameter page sections

nand_flash_detect_ext_param_page() allocates the length declared by the
ONFI parameter page, then treats the data as a fixed header followed by
variable-length sections. It reads that header and advances over sections
without first proving that the fixed page and each current section fit in
the allocation.

Reject pages shorter than the fixed header, track the remaining variable
area while walking sections, and require the ECC section to contain every
field read from struct onfi_ext_ecc_info. Use device-scoped diagnostics
that identify the malformed ONFI section.

The Linux kernel CVE team has assigned CVE-2026-89952 to this issue.


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

	Issue introduced in 3.12 with commit 6dcbe0cdd83fb5f77be4f44c9e06c535281c375a and fixed in 5.10.270 with commit 1bf148fabe6463422195b7cc43b3412533f1dc21
	Issue introduced in 3.12 with commit 6dcbe0cdd83fb5f77be4f44c9e06c535281c375a and fixed in 5.15.221 with commit c7df90bbda71549bfd981bf478ad04ddfccf4e0d
	Issue introduced in 3.12 with commit 6dcbe0cdd83fb5f77be4f44c9e06c535281c375a and fixed in 6.1.188 with commit 86948f81964e40cd6472d76a6371e4f297d84db0
	Issue introduced in 3.12 with commit 6dcbe0cdd83fb5f77be4f44c9e06c535281c375a and fixed in 6.6.157 with commit ddb6ddf5be7429bb98b3368c883be51f00b31678
	Issue introduced in 3.12 with commit 6dcbe0cdd83fb5f77be4f44c9e06c535281c375a and fixed in 6.12.110 with commit 12a63a0f0d17b2d26211b2524ded91a67dd5c99c
	Issue introduced in 3.12 with commit 6dcbe0cdd83fb5f77be4f44c9e06c535281c375a and fixed in 6.18.51 with commit c8f86e375b39cada09fd8cb33dd3bb3641e84a62
	Issue introduced in 3.12 with commit 6dcbe0cdd83fb5f77be4f44c9e06c535281c375a and fixed in 7.2.5 with commit 23e747fe585830c43095c37c85b2757231c6917f
	Issue introduced in 3.12 with commit 6dcbe0cdd83fb5f77be4f44c9e06c535281c375a and fixed in 7.3-rc1 with commit e5e415262330bd70f983e091d8919d9dcd99e475

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-2026-89952
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/mtd/nand/raw/nand_onfi.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/1bf148fabe6463422195b7cc43b3412533f1dc21
	https://git.kernel.org/stable/c/c7df90bbda71549bfd981bf478ad04ddfccf4e0d
	https://git.kernel.org/stable/c/86948f81964e40cd6472d76a6371e4f297d84db0
	https://git.kernel.org/stable/c/ddb6ddf5be7429bb98b3368c883be51f00b31678
	https://git.kernel.org/stable/c/12a63a0f0d17b2d26211b2524ded91a67dd5c99c
	https://git.kernel.org/stable/c/c8f86e375b39cada09fd8cb33dd3bb3641e84a62
	https://git.kernel.org/stable/c/23e747fe585830c43095c37c85b2757231c6917f
	https://git.kernel.org/stable/c/e5e415262330bd70f983e091d8919d9dcd99e475