CVE-2026-46081

Kernel memory corruption via wrong request pointer

Published May 27, 2026 · Updated May 27, 2026

Memory corruption in the Linux Kernel acomp subsystem allows local users to crash the kernel or alter kernel memory through UBIFS file I/O. acomp_save_req() stores the address of req->chain as callback data, but acomp_reqchain_done() casts that interior pointer to struct acomp_req and accesses fields at incorrect offsets. The path requires user-accessible UBIFS data and an asynchronous hardware compressor, such as QAT, using the DMA virtual address interface; network-facing IPComp callers do not reach it.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux Kernel acomp subsystem allows local users to crash the kernel or alter kernel memory through UBIFS file I/O. acomp_save_req() stores the address of req->chain as callback data, but acomp_reqchain_done() casts that interior pointer to struct acomp_req and accesses fields at incorrect offsets. The path requires user-accessible UBIFS data and an asynchronous hardware compressor, such as QAT, using the DMA virtual address interface; network-facing IPComp callers do not reach it.

The record

CVE
CVE-2026-46081
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=6.16
  2. Affected versionversion=64929fe8c0a43508eee952cf57903a61c52601e7 <1a2785e5985627f2265ba7775949601a29ba0d1e
  3. Affected versionversion=64929fe8c0a43508eee952cf57903a61c52601e7 <343a5bf68a8ff9affcf2b70677ea4cf40c195ee4
  4. Affected versionversion=64929fe8c0a43508eee952cf57903a61c52601e7 <d7e20b9bd6c990773cf0c09e2642250b8a70263d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=64929fe8c0a43508eee952cf57903a61c52601e7 <1a2785e5985627f2265ba7775949601a29ba0d1e; version=64929fe8c0a43508eee952cf57903a61c52601e7 <343a5bf68a8ff9affcf2b70677ea4cf40c195ee4; version=64929fe8c0a43508eee952cf57903a61c52601e7 <d7e20b9bd6c990773cf0c09e2642250b8a70263d

Published CVSS scores

7.8Linux kernel CVE teamCVSS: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-787Out-of-bounds Write
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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