CVE-2023-54295

Kernel disruption via invalid erase-type shift

Published Dec 30, 2025 · Updated Dec 30, 2025

Out-of-bounds shifting in the Linux kernel allows local users to disrupt the system through SPI-NOR erase-type masking. In spi_nor_set_erase_type, masking an erase type with a zero size subtracts one from a zero shift value and uses the resulting 4294967295 as a 32-bit shift exponent. The path requires local access and the affected SPI-NOR driver state; no remote trigger is identified.

CVSS severity6.9
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds shifting in the Linux kernel allows local users to disrupt the system through SPI-NOR erase-type masking. In spi_nor_set_erase_type, masking an erase type with a zero size subtracts one from a zero shift value and uses the resulting 4294967295 as a 32-bit shift exponent. The path requires local access and the affected SPI-NOR driver state; no remote trigger is identified.

The record

CVE
CVE-2023-54295
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.20
  2. Affected versionversion=5390a8df769ec9ba9c995191bb0867430f602ebb <53b2916ebde741c657a857fa1936c0d9fcb59170
  3. Affected versionversion=5390a8df769ec9ba9c995191bb0867430f602ebb <61d44a4db2f54dbac7d22c2541574ea5755e0468
  4. Affected versionversion=5390a8df769ec9ba9c995191bb0867430f602ebb <99341b8aee7b5b4255b339345bbcaa35867dfd0c
  5. Affected versionversion=5390a8df769ec9ba9c995191bb0867430f602ebb <e6409208c13f7c56adc12dd795abf4141e3d5e64
  6. Affected versionversion=5390a8df769ec9ba9c995191bb0867430f602ebb <f0f0cfdc3a024e21161714f2e05f0df3b84d42ad

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=5390a8df769ec9ba9c995191bb0867430f602ebb <53b2916ebde741c657a857fa1936c0d9fcb59170; version=5390a8df769ec9ba9c995191bb0867430f602ebb <61d44a4db2f54dbac7d22c2541574ea5755e0468; version=5390a8df769ec9ba9c995191bb0867430f602ebb <99341b8aee7b5b4255b339345bbcaa35867dfd0c; version=5390a8df769ec9ba9c995191bb0867430f602ebb <e6409208c13f7c56adc12dd795abf4141e3d5e64; version=5390a8df769ec9ba9c995191bb0867430f602ebb <f0f0cfdc3a024e21161714f2e05f0df3b84d42ad

Published CVSS scores

6.9SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
6.6SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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