CVE-2026-23275

Kernel memory corruption via freed rings pointer

Published Mar 20, 2026 · Updated Mar 20, 2026

Memory corruption in Linux Kernel io_uring allows local users to corrupt freed ring memory during concurrent ring resizing. The io_ctx_mark_taskrun path ORs IORING_SQ_TASKRUN through ctx->rings while resize can swap that pointer and free the old rings, leaving task-work flag manipulation aimed at freed memory. A low-privileged local process must create a ring with DEFER_TASKRUN and SETUP_TASKRUN, then race task-work addition against resizing; successful corruption can compromise kernel confidentiality, integrity, and availability.

CVSS severity7.3
High
EPSS probability0.12%
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 Linux Kernel io_uring allows local users to corrupt freed ring memory during concurrent ring resizing. The io_ctx_mark_taskrun path ORs IORING_SQ_TASKRUN through ctx->rings while resize can swap that pointer and free the old rings, leaving task-work flag manipulation aimed at freed memory. A low-privileged local process must create a ring with DEFER_TASKRUN and SETUP_TASKRUN, then race task-work addition against resizing; successful corruption can compromise kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2026-23275
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=6.13
  2. Affected versionversion=79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 <46dc07d5f31411cc023f3bf1f4a23a07bf6e0ed1
  3. Affected versionversion=79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 <7cc4530b3e952d4a5947e1e55d06620d8845d4f5
  4. Affected versionversion=79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 <96189080265e6bb5dde3a4afbaf947af493e3f82

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.13; version=79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 <46dc07d5f31411cc023f3bf1f4a23a07bf6e0ed1; version=79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 <7cc4530b3e952d4a5947e1e55d06620d8845d4f5; version=79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 <96189080265e6bb5dde3a4afbaf947af493e3f82

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3UbuntuCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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.

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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