CVE-2026-53191

Local memory corruption via dropped buffer-reuse flag

Published Jun 25, 2026 · Updated Jun 25, 2026

Memory corruption in the Linux Kernel io_uring network path allows local users to corrupt reused receive buffers through bundle receive retries. io_recv_finish() omits IORING_CQE_F_BUF_MORE from CQE_F_MASK, dropping the partial-consumption flag while merging completion flags and allowing userspace to advance past a buffer still owned by the kernel. An unprivileged local process must configure incremental provided-buffer rings, buffer selection, and bundle receive; stale ownership can disclose or corrupt memory and destabilize the receiver.

CVSS severity7.8
High
EPSS probability0.18%
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 io_uring network path allows local users to corrupt reused receive buffers through bundle receive retries. io_recv_finish() omits IORING_CQE_F_BUF_MORE from CQE_F_MASK, dropping the partial-consumption flag while merging completion flags and allowing userspace to advance past a buffer still owned by the kernel. An unprivileged local process must configure incremental provided-buffer rings, buffer selection, and bundle receive; stale ownership can disclose or corrupt memory and destabilize the receiver.

The record

CVE
CVE-2026-53191
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=6.12
  2. Affected versionversion=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <0bbc9481f970b0b4ddb08cfa464db1cc93b74b56
  3. Affected versionversion=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <4973232a67e4137ab9399f504f7f2bdd847f96d2
  4. Affected versionversion=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <ed46f39c47eb5530a9c161481a2080d3a869cfaf
  5. Affected versionversion=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <f40570fda3f3a1f96aeaa4aef665ba274b2810b5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <0bbc9481f970b0b4ddb08cfa464db1cc93b74b56; version=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <4973232a67e4137ab9399f504f7f2bdd847f96d2; version=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <ed46f39c47eb5530a9c161481a2080d3a869cfaf; version=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <f40570fda3f3a1f96aeaa4aef665ba274b2810b5

Published CVSS scores

7.8kernel.orgCVSS: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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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