CVE-2024-56764

Kernel memory corruption via dangling gendisk pointer

Published Jan 6, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel ublk 6.7 through 6.12.7 and 6.13 release candidates allows local users to corrupt kernel memory. If add_disk() fails, the freed gendisk remains in ub->ub_disk, and ublk_abort_requests() later takes a reference through that dangling pointer. Access to /dev/ublk-control with unprivileged ublk support is sufficient; exploitation can disclose kernel memory, alter control flow, or panic the host.

CVSS severity7.8
High
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

Use-after-free in Linux kernel ublk 6.7 through 6.12.7 and 6.13 release candidates allows local users to corrupt kernel memory. If add_disk() fails, the freed gendisk remains in ub->ub_disk, and ublk_abort_requests() later takes a reference through that dangling pointer. Access to /dev/ublk-control with unprivileged ublk support is sufficient; exploitation can disclose kernel memory, alter control flow, or panic the host.

The record

CVE
CVE-2024-56764
Published
Jan 6, 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. Jan 6, 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

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=6.7
  2. Affected versionversion=bd23f6c2c2d00518e2f27f2d25cef795de9bee56 <75cd4005da5492129917a4a4ee45e81660556104
  3. Affected versionversion=bd23f6c2c2d00518e2f27f2d25cef795de9bee56 <7d680f2f76a3417fdfc3946da7471e81464f7b41

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=bd23f6c2c2d00518e2f27f2d25cef795de9bee56 <75cd4005da5492129917a4a4ee45e81660556104; version=bd23f6c2c2d00518e2f27f2d25cef795de9bee56 <7d680f2f76a3417fdfc3946da7471e81464f7b41

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3SUSECVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8SUSECVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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