CVE-2023-52983

Kernel memory corruption via dangling BFQ queue pointer

Published Mar 27, 2025 · Updated Aug 5, 2026

Use-after-free in the BFQ I/O scheduler in Linux allows local users to access freed kernel memory through block I/O activity. bic_set_bfqq() dereferences and writes through an old bfqq pointer after the queue has been freed because release occurs before the pointer update completes. Exploitation requires low-privileged local access and the affected BFQ path; successful abuse can corrupt kernel memory, expose data, alter system state, or crash the host.

CVSS severity7.8
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the BFQ I/O scheduler in Linux allows local users to access freed kernel memory through block I/O activity. bic_set_bfqq() dereferences and writes through an old bfqq pointer after the queue has been freed because release occurs before the pointer update completes. Exploitation requires low-privileged local access and the affected BFQ path; successful abuse can corrupt kernel memory, expose data, alter system state, or crash the host.

The record

CVE
CVE-2023-52983
Published
Mar 27, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record 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=094f3d9314d67691cb21ba091c1b528f6e3c4893 <511c922c5bf6c8a166bea826e702336bc2424140
  2. Affected versionversion=5.15.86 <5.15.93
  3. Affected versionversion=5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a <7f77f3dab5066a7c9da73d72d1eee895ff84a8d5
  4. Affected versionversion=6.0.16 <6.1
  5. Affected versionversion=6.1.2 <6.1.11
  6. Affected versionversion=64dc8c732f5c2b406cc752e6aaa1bd5471159cab <b600de2d7d3a16f9007fad1bdae82a3951a26af2
  7. Affected versionversion=761564d93c8265f65543acf0a576b32d66bfa26a <cb1876fc33af26d00efdd473311f1b664c77c44e
  8. Affected versionversion=b22fd72bfebda3956efc4431b60ddfc0a51e03e0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=094f3d9314d67691cb21ba091c1b528f6e3c4893 <511c922c5bf6c8a166bea826e702336bc2424140; version=5.15.86 <5.15.93; version=5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a <7f77f3dab5066a7c9da73d72d1eee895ff84a8d5; version=6.0.16 <6.1; version=6.1.2 <6.1.11; version=64dc8c732f5c2b406cc752e6aaa1bd5471159cab <b600de2d7d3a16f9007fad1bdae82a3951a26af2; version=761564d93c8265f65543acf0a576b32d66bfa26a <cb1876fc33af26d00efdd473311f1b664c77c44e; version=b22fd72bfebda3956efc4431b60ddfc0a51e03e0

Published CVSS scores

7.8CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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