CVE-2023-53032

Incorrect intermediate value via integer overflow

Published Mar 27, 2025 · Updated May 11, 2026

Integer overflow in Linux kernel 3.7 through 6.1.6 allows local users to produce an incorrect intermediate value in ipset. In bitmap_ip_create(), 2 is shifted before either operand is widened when first_ip is 0, last_ip is 0xFFFFFFFF, and netmask is 31, so the arithmetic overflows. The path requires local low-privileged access to create the crafted bitmap set; the next validation rejects the value, and the Linux kernel team reports no resulting security impact.

CVSS severity5.5
Medium
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 3.7 through 6.1.6 allows local users to produce an incorrect intermediate value in ipset. In bitmap_ip_create(), 2 is shifted before either operand is widened when first_ip is 0, last_ip is 0xFFFFFFFF, and netmask is 31, so the arithmetic overflows. The path requires local low-privileged access to create the crafted bitmap set; the next validation rejects the value, and the Linux kernel team reports no resulting security impact.

The record

CVE
CVE-2023-53032
Published
Mar 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.7
  2. Affected versionversion=b9fed748185a96b7cfe74afac4bd228e8af16f01 <4e6a70fd840400e3a2e784a6673968a3eb2431c0
  3. Affected versionversion=b9fed748185a96b7cfe74afac4bd228e8af16f01 <511cf17b2447fc41cfef8d71936e1fa53e395c1e
  4. Affected versionversion=b9fed748185a96b7cfe74afac4bd228e8af16f01 <9ea4b476cea1b7d461d16dda25ca3c7e616e2d15
  5. Affected versionversion=b9fed748185a96b7cfe74afac4bd228e8af16f01 <dfd834ccc1b88bbbab81b9046a3a539dd0c2d14f
  6. Affected versionversion=b9fed748185a96b7cfe74afac4bd228e8af16f01 <e137d9bb26bd85ce07323a38e38ceb0b160db841
  7. Affected versionversion=b9fed748185a96b7cfe74afac4bd228e8af16f01 <e88865876d47c790be0d5e23973499d75d034364
  8. Affected versionversion=b9fed748185a96b7cfe74afac4bd228e8af16f01 <feefb33eefa166fc3e0fd17547b0bc0cb3baced9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.7; version=b9fed748185a96b7cfe74afac4bd228e8af16f01 <4e6a70fd840400e3a2e784a6673968a3eb2431c0; version=b9fed748185a96b7cfe74afac4bd228e8af16f01 <511cf17b2447fc41cfef8d71936e1fa53e395c1e; version=b9fed748185a96b7cfe74afac4bd228e8af16f01 <9ea4b476cea1b7d461d16dda25ca3c7e616e2d15; version=b9fed748185a96b7cfe74afac4bd228e8af16f01 <dfd834ccc1b88bbbab81b9046a3a539dd0c2d14f; version=b9fed748185a96b7cfe74afac4bd228e8af16f01 <e137d9bb26bd85ce07323a38e38ceb0b160db841; version=b9fed748185a96b7cfe74afac4bd228e8af16f01 <e88865876d47c790be0d5e23973499d75d034364; version=b9fed748185a96b7cfe74afac4bd228e8af16f01 <feefb33eefa166fc3e0fd17547b0bc0cb3baced9

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS: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

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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