CVE-2026-45852

Local system crash via stale queue pointer

Published May 27, 2026 · Updated May 27, 2026

Double free in the Linux kernel RDMA/rxe driver allows local users to crash the system while creating a shared receive queue. rxe_srq_from_init stores a queue pointer before copy_to_user; on copy failure it frees the queue but leaves the stale pointer for cleanup to free again. Low-privileged local access and an available RDMA/rxe device are required; successful triggering causes a kernel crash.

CVSS severity7.8
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Double free in the Linux kernel RDMA/rxe driver allows local users to crash the system while creating a shared receive queue. rxe_srq_from_init stores a queue pointer before copy_to_user; on copy failure it frees the queue but leaves the stale pointer for cleanup to free again. Low-privileged local access and an available RDMA/rxe device are required; successful triggering causes a kernel crash.

The record

CVE
CVE-2026-45852
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-1341, CWE-415, T1499.004
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=350703fae672d4d649c3562c199eab5ec9dc7c79
  2. Affected versionversion=4.19.86 <4.20
  3. Affected versionversion=4.20
  4. Affected versionversion=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <0beefd0e15d962f497aad750b2d5e9c3570b66d1
  5. Affected versionversion=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <22b8c23a3b92d023614bb00896fe364b2c1a31d3
  6. Affected versionversion=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <26793db60925df1e88a29466813d586cbc190b8c
  7. Affected versionversion=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <26a9cfe12f4ffdeaa136f252478986fa5f397ddc
  8. Affected versionversion=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <5c07aef09a121a4cd622a71eb0753a9e135c84a8
  9. Affected versionversion=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <af5956243018918130d52c9f671efdb40bab3366
  10. Affected versionversion=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <ce6f8e007682f378279d4cf83b240f12d52c723b
  11. Affected versionversion=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <d286f0d4e3ad3caf5f0e673cdad7bf89bf37d947

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=350703fae672d4d649c3562c199eab5ec9dc7c79; version=4.19.86 <4.20; version=4.20; version=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <0beefd0e15d962f497aad750b2d5e9c3570b66d1; version=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <22b8c23a3b92d023614bb00896fe364b2c1a31d3; version=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <26793db60925df1e88a29466813d586cbc190b8c; version=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <26a9cfe12f4ffdeaa136f252478986fa5f397ddc; version=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <5c07aef09a121a4cd622a71eb0753a9e135c84a8; version=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <af5956243018918130d52c9f671efdb40bab3366; version=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <ce6f8e007682f378279d4cf83b240f12d52c723b; version=aae0484e15f062ad2c2502e68e15dfb8b8f84608 <d286f0d4e3ad3caf5f0e673cdad7bf89bf37d947

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red Hat Security Data PublisherCVSS:3.1/AV:L/AC:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-1341Multiple Releases of Same Resource or Handle
CWE-415Double Free
T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo