CVE-2023-52835

Kernel allocation warning via oversized AUX mmap

Published May 21, 2024 · Updated May 11, 2026

Improper size validation in affected Linux kernel releases allows local users to trigger an allocation warning through a perf AUX mmap. kernel/events/ring_buffer.c lets rb_alloc_aux pass an oversized rb->aux_pages pointer-array request to kcalloc without first enforcing the MAX_ORDER allocation bound. A low-privileged user must be able to open and map an AUX-capable perf event; the oversized request fails with ENOMEM after reaching the kernel allocator warning path.

CVSS severity7.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper size validation in affected Linux kernel releases allows local users to trigger an allocation warning through a perf AUX mmap. kernel/events/ring_buffer.c lets rb_alloc_aux pass an oversized rb->aux_pages pointer-array request to kcalloc without first enforcing the MAX_ORDER allocation bound. A low-privileged user must be able to open and map an AUX-capable perf event; the oversized request fails with ENOMEM after reaching the kernel allocator warning path.

The record

CVE
CVE-2023-52835
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=4.1
  2. Affected versionversion=45bfb2e50471abbbfd83d40d28c986078b0d24ff <1a2a4202c60fcdffbf04f259002ce9bff39edece
  3. Affected versionversion=45bfb2e50471abbbfd83d40d28c986078b0d24ff <2424410f94a94d91230ced094062d859714c984a
  4. Affected versionversion=45bfb2e50471abbbfd83d40d28c986078b0d24ff <2e905e608e38cf7f8dcddcf8a6036e91a78444cb
  5. Affected versionversion=45bfb2e50471abbbfd83d40d28c986078b0d24ff <54aee5f15b83437f23b2b2469bcf21bdd9823916
  6. Affected versionversion=45bfb2e50471abbbfd83d40d28c986078b0d24ff <788c0b3442ead737008934947730a6d1ff703734
  7. Affected versionversion=45bfb2e50471abbbfd83d40d28c986078b0d24ff <8c504f615d7ed60ae035c51d0c789137ced6797f
  8. Affected versionversion=45bfb2e50471abbbfd83d40d28c986078b0d24ff <9ce4e87a8efd37c85766ec08b15e885cab08553a
  9. Affected versionversion=45bfb2e50471abbbfd83d40d28c986078b0d24ff <fd0df3f8719201dbe61a4d39083d5aecd705399a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.1; version=45bfb2e50471abbbfd83d40d28c986078b0d24ff <1a2a4202c60fcdffbf04f259002ce9bff39edece; version=45bfb2e50471abbbfd83d40d28c986078b0d24ff <2424410f94a94d91230ced094062d859714c984a; version=45bfb2e50471abbbfd83d40d28c986078b0d24ff <2e905e608e38cf7f8dcddcf8a6036e91a78444cb; version=45bfb2e50471abbbfd83d40d28c986078b0d24ff <54aee5f15b83437f23b2b2469bcf21bdd9823916; version=45bfb2e50471abbbfd83d40d28c986078b0d24ff <788c0b3442ead737008934947730a6d1ff703734; version=45bfb2e50471abbbfd83d40d28c986078b0d24ff <8c504f615d7ed60ae035c51d0c789137ced6797f; version=45bfb2e50471abbbfd83d40d28c986078b0d24ff <9ce4e87a8efd37c85766ec08b15e885cab08553a; version=45bfb2e50471abbbfd83d40d28c986078b0d24ff <fd0df3f8719201dbe61a4d39083d5aecd705399a

Published CVSS scores

7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS: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

T1499Endpoint Denial of Service

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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