CVE-2023-53558

Service interruption via sleeping printk under spinlock

Published Oct 4, 2025 · Updated Oct 4, 2025

Improper locking in Linux 5.17 through 6.1.41 and 6.2 through 6.4.6 allows local users to interrupt service during RCU Tasks setup. In cblist_init_generic(), pr_info() invokes the potentially sleeping printk() path while rtp->cbs_gbl_lock is held, producing an invalid wait-context BUG. Low-privileged local access is required, and the documented consequence is availability loss rather than data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux 5.17 through 6.1.41 and 6.2 through 6.4.6 allows local users to interrupt service during RCU Tasks setup. In cblist_init_generic(), pr_info() invokes the potentially sleeping printk() path while rtp->cbs_gbl_lock is held, producing an invalid wait-context BUG. Low-privileged local access is required, and the documented consequence is availability loss rather than data disclosure or modification.

The record

CVE
CVE-2023-53558
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 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?

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

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5fc8cbe4cf0fd34ded8045c385790c3bf04f6785
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9027d69221ff96e1356f070f7feb2ff989ae7388
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ea9b81c7d9104040b46a84d2303045de267f5557

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5fc8cbe4cf0fd34ded8045c385790c3bf04f6785; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9027d69221ff96e1356f070f7feb2ff989ae7388; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ea9b81c7d9104040b46a84d2303045de267f5557

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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