CVE-2023-53824

Kernel memory corruption via netlink data race

Published Dec 9, 2025 · Updated Aug 5, 2026

Data race in the Linux kernel netlink subsystem allows local users to corrupt kernel memory through concurrent receive and dump operations. netlink_recvmsg() reads and writes nlk->max_recvmsg_len without synchronization while netlink_dump() uses the raced value for unchecked signed skb_reserve() pointer adjustment. Any unprivileged user can open the required NETLINK_ROUTE socket and race the calls without user interaction, producing out-of-bounds heap disclosure, writes, memory pressure, or a kernel panic.

CVSS severity7.8
High
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

Data race in the Linux kernel netlink subsystem allows local users to corrupt kernel memory through concurrent receive and dump operations. netlink_recvmsg() reads and writes nlk->max_recvmsg_len without synchronization while netlink_dump() uses the raced value for unchecked signed skb_reserve() pointer adjustment. Any unprivileged user can open the required NETLINK_ROUTE socket and race the calls without user interaction, producing out-of-bounds heap disclosure, writes, memory pressure, or a kernel panic.

The record

CVE
CVE-2023-53824
Published
Dec 9, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 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=3.15
  2. Affected versionversion=9063e21fb026c4966fc93261c18322214f9835eb <05c9e3fc93b02d18c3ab258d43350a6d44b40bbd
  3. Affected versionversion=9063e21fb026c4966fc93261c18322214f9835eb <7cff4103be7c402ecc3e7bf8f95a64089e3c91b8
  4. Affected versionversion=9063e21fb026c4966fc93261c18322214f9835eb <a1865f2e7d10dde00d35a2122b38d2e469ae67ed
  5. Affected versionversion=9063e21fb026c4966fc93261c18322214f9835eb <e3bcf2a77060bea4d8d09cb09d92c7056f07df5a
  6. Affected versionversion=9063e21fb026c4966fc93261c18322214f9835eb <fc4ba13013ddaea8b11b88fd52b35449e2d9cf85

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.15; version=9063e21fb026c4966fc93261c18322214f9835eb <05c9e3fc93b02d18c3ab258d43350a6d44b40bbd; version=9063e21fb026c4966fc93261c18322214f9835eb <7cff4103be7c402ecc3e7bf8f95a64089e3c91b8; version=9063e21fb026c4966fc93261c18322214f9835eb <a1865f2e7d10dde00d35a2122b38d2e469ae67ed; version=9063e21fb026c4966fc93261c18322214f9835eb <e3bcf2a77060bea4d8d09cb09d92c7056f07df5a; version=9063e21fb026c4966fc93261c18322214f9835eb <fc4ba13013ddaea8b11b88fd52b35449e2d9cf85

Published CVSS scores

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

T1068Exploitation for Privilege Escalation

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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