Review reviewHigh

CVE-2023-54104

Linux

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.

CVSS: 7.8
EPSS: 0.14%
CISA KEV: Not listed
Published: 2025.12.24

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.14%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= 54309d65776755bcdb9dcf3744cd764fc1e254ea < 1f09d67d390647f83f8f9d26382b0daa43756e6f, >= 54309d65776755bcdb9dcf3744cd764fc1e254ea < eb7a5e4d14c8659cb97db6863316280e15f67209, >= 54309d65776755bcdb9dcf3744cd764fc1e254ea < f4b700c71802c81e6f9dce362ee7a0312c8377ba, >= 54309d65776755bcdb9dcf3744cd764fc1e254ea < 49e57caf967a969f6b955c88805f2d160910aa12, >= 54309d65776755bcdb9dcf3744cd764fc1e254ea < c6abce60338aa2080973cd95be0aedad528bb41f, >= 5.9
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: Not available