CVE-2023-54293

Kernel crash via stale bcache wait-list entry

Published Dec 30, 2025 · Updated Dec 30, 2025

Denial of service in Linux kernel bcache allows attackers to crash the kernel during concurrent cached btree node allocation. Waiting operations remain linked in btree_cache_wait when their memory is freed because the path omits finish_wait(), corrupting the list; it also fails to release btree_cache_alloc_lock. The affected path requires bcache and competing kernel threads to cannibalize cached btree nodes; no user-controlled trigger has been published.

CVSS severityUnavailable
Unscored
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

Denial of service in Linux kernel bcache allows attackers to crash the kernel during concurrent cached btree node allocation. Waiting operations remain linked in btree_cache_wait when their memory is freed because the path omits finish_wait(), corrupting the list; it also fails to release btree_cache_alloc_lock. The affected path requires bcache and competing kernel threads to cannibalize cached btree nodes; no user-controlled trigger has been published.

The record

CVE
CVE-2023-54293
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

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

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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=5.7
  2. Affected versionversion=8e7102273f597dbb38af43da874f8c123f8e6dbe <25ec4779d0fb3ed9cac1e4d9e0e4261b4a12f6ed
  3. Affected versionversion=8e7102273f597dbb38af43da874f8c123f8e6dbe <2882a4c4f0c90e99f37dbd8db369b9982fd613e7
  4. Affected versionversion=8e7102273f597dbb38af43da874f8c123f8e6dbe <bcb295778afda4f2feb0d3c0289a53fd43d5a3a6
  5. Affected versionversion=8e7102273f597dbb38af43da874f8c123f8e6dbe <cbdd5b3322f7bbe6454c97cac994757f1192c07b
  6. Affected versionversion=8e7102273f597dbb38af43da874f8c123f8e6dbe <f0854489fc07d2456f7cc71a63f4faf9c716ffbe

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.7; version=8e7102273f597dbb38af43da874f8c123f8e6dbe <25ec4779d0fb3ed9cac1e4d9e0e4261b4a12f6ed; version=8e7102273f597dbb38af43da874f8c123f8e6dbe <2882a4c4f0c90e99f37dbd8db369b9982fd613e7; version=8e7102273f597dbb38af43da874f8c123f8e6dbe <bcb295778afda4f2feb0d3c0289a53fd43d5a3a6; version=8e7102273f597dbb38af43da874f8c123f8e6dbe <cbdd5b3322f7bbe6454c97cac994757f1192c07b; version=8e7102273f597dbb38af43da874f8c123f8e6dbe <f0854489fc07d2456f7cc71a63f4faf9c716ffbe

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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