CVE-2023-53321

Kernel memory disclosure and crash via short frames

Published Sep 16, 2025 · Updated Sep 16, 2025

Out-of-bounds read in the Linux mac80211_hwsim module allows local users to disclose kernel memory or crash the host via a short frame. mac80211_hwsim_rx reads address fields beyond an undersized HWSIM_ATTR_FRAME payload into uninitialized or out-of-bounds skb-head memory. Reachability requires registration as wmediumd or virtio mode; user and network namespaces can supply CAP_NET_ADMIN, and no user interaction is needed.

CVSS severity7.1
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux mac80211_hwsim module allows local users to disclose kernel memory or crash the host via a short frame. mac80211_hwsim_rx reads address fields beyond an undersized HWSIM_ATTR_FRAME payload into uninitialized or out-of-bounds skb-head memory. Reachability requires registration as wmediumd or virtio mode; user and network namespaces can supply CAP_NET_ADMIN, and no user interaction is needed.

The record

CVE
CVE-2023-53321
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3beb97bed860d95b14ad23578ce8ddaea62023db
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <672205c6f2d11978fcd7f0f336bb2c708e28874b
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89a41ed7f21476301659ebd25ccb48a60791c1a7
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b9a175e3b250b0dc6e152988040aa5014e98e61e
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c64ee9dd335832d5e2ab0a8fc83a34ad4c729799
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fba360a047d5eeeb9d4b7c3a9b1c8308980ce9a6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3beb97bed860d95b14ad23578ce8ddaea62023db; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <672205c6f2d11978fcd7f0f336bb2c708e28874b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89a41ed7f21476301659ebd25ccb48a60791c1a7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b9a175e3b250b0dc6e152988040aa5014e98e61e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c64ee9dd335832d5e2ab0a8fc83a34ad4c729799; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fba360a047d5eeeb9d4b7c3a9b1c8308980ce9a6

Published CVSS scores

7.0SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.3SUSECVSS:4.0/AV:L/AC:H/AT:N/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.

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

T1499Endpoint Denial of Service

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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