Bug 2425130 (CVE-2023-54104)

Summary:	CVE-2023-54104 kernel: Linux kernel: Privilege escalation via out-of-bounds access in NAND flash driver
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's mtd: rawnand: fsl_upm driver. A local attacker with low privileges could exploit an off-by-one error in the `fun_exec_op()` function, leading to out-of-bounds memory accesses. This vulnerability could result in privilege escalation, allowing the attacker to gain elevated system access, or cause information disclosure or a denial of service.	Story Points:	---
Clone Of:		Environment:
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-12-24 14:05:10 UTC

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

mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op()

'op-cs' is copied in 'fun->mchip_number' which is used to access the
'mchip_offsets' and the 'rnb_gpio' arrays.
These arrays have NAND_MAX_CHIPS elements, so the index must be below this
limit.

Fix the sanity check in order to avoid the NAND_MAX_CHIPS value. This
would lead to out-of-bound accesses.

Comment 1 Alexander B 2025-12-25 00:14:52 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122411-CVE-2023-54104-32e0@gregkh/T