CVE-2023-3108

System crash via stale skcipher receive length

Published Jul 11, 2023 · Updated Nov 20, 2025

Race condition in the Linux kernel's symmetric-key cipher interface allows local users to crash the system through an AF_ALG socket. In skcipher_recvmsg, the code preserves ctx->used as zero before waiting for socket data and passes that stale zero length to af_alg_make_sg after data arrives. Local access to the AF_ALG interface is required, and the demonstrated consequence is a system crash without reported data disclosure or modification.

CVSS severity6.2
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel's symmetric-key cipher interface allows local users to crash the system through an AF_ALG socket. In skcipher_recvmsg, the code preserves ctx->used as zero before waiting for socket data and passes that stale zero length to af_alg_make_sg after data arrives. Local access to the AF_ALG interface is required, and the demonstrated consequence is a system crash without reported data disclosure or modification.

The record

CVE
CVE-2023-3108
Published
Jul 11, 2023
Updated
Nov 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, CWE-400, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.7UbuntuCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
6.2Red HatCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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