CVE-2023-53026

Host compromise or hang via RDMA counter overflow

Published Mar 27, 2025 · Updated Aug 5, 2026

Integer overflow in Linux kernel RDMA/core allows local users to hang or corrupt the host through a crafted large memory registration. The block iterator stores its scatter-gather advancement in a 32-bit counter, which wraps when misaligned aligned-page coverage reaches at least 4 GB. Access to a uverbs device and a suitable large RDMA memory registration are required; the resulting loop and out-of-bounds writes can lock up the kernel or corrupt kernel memory.

CVSS severity7.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux kernel RDMA/core allows local users to hang or corrupt the host through a crafted large memory registration. The block iterator stores its scatter-gather advancement in a 32-bit counter, which wraps when misaligned aligned-page coverage reaches at least 4 GB. Access to a uverbs device and a suitable large RDMA memory registration are required; the resulting loop and out-of-bounds writes can lock up the kernel or corrupt kernel memory.

The record

CVE
CVE-2023-53026
Published
Mar 27, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-835, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.2
  2. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <0afec5e9cea732cb47014655685a2a47fb180c31
  3. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <362c9489720b31b6aa7491423ba65a4e98aa9838
  4. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <43811d07ea64366af8ec9e168c558ec51440c39e
  5. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <902063a9fea5f8252df392ade746bc9cfd07a5ae
  6. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <d66c1d4178c219b6e7d7a6f714e3e3656faccc36

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.2; version=a808273a495c657e33281b181fd7fcc2bb28f662 <0afec5e9cea732cb47014655685a2a47fb180c31; version=a808273a495c657e33281b181fd7fcc2bb28f662 <362c9489720b31b6aa7491423ba65a4e98aa9838; version=a808273a495c657e33281b181fd7fcc2bb28f662 <43811d07ea64366af8ec9e168c558ec51440c39e; version=a808273a495c657e33281b181fd7fcc2bb28f662 <902063a9fea5f8252df392ade746bc9cfd07a5ae; version=a808273a495c657e33281b181fd7fcc2bb28f662 <d66c1d4178c219b6e7d7a6f714e3e3656faccc36

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Endpoint Denial of Service: Application 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

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Your stack

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