CVE-2026-52985

Kernel service interruption via uninitialized IP header

Published Jun 24, 2026 · Updated Jun 24, 2026

Uninitialized resource use in Linux Kernel netdevsim allows local users to disrupt availability through driver-specific trap reporting. nsim_dev_trap_skb_build reserves an IPv4 header with skb_put, leaving header bytes uninitialized before the dummy sk_buff is reported through a devlink trap. Reachability requires local privileges and an active netdevsim trap path; syzbot reproduced the KMSAN report but assessed no unprivileged or denial-of-service trigger.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uninitialized resource use in Linux Kernel netdevsim allows local users to disrupt availability through driver-specific trap reporting. nsim_dev_trap_skb_build reserves an IPv4 header with skb_put, leaving header bytes uninitialized before the dummy sk_buff is reported through a devlink trap. Reachability requires local privileges and an active netdevsim trap path; syzbot reproduced the KMSAN report but assessed no unprivileged or denial-of-service trigger.

The record

CVE
CVE-2026-52985
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=5.4
  2. Affected versionversion=da58f90f11f597520f226caff1d3cfc115abedc9 <175556c049eaec14efde8c6475e763b7579b9de7
  3. Affected versionversion=da58f90f11f597520f226caff1d3cfc115abedc9 <1b7b6ae0e93b8d512e208b1378d74af052e4f4e7
  4. Affected versionversion=da58f90f11f597520f226caff1d3cfc115abedc9 <35eaa6d8d6c2ee65e96f507add856e0eacf24591
  5. Affected versionversion=da58f90f11f597520f226caff1d3cfc115abedc9 <6e2cfd0904976e701d7a76b86b694e72af230ab0
  6. Affected versionversion=da58f90f11f597520f226caff1d3cfc115abedc9 <750d0091bebf44975421268d37484ef87060d263
  7. Affected versionversion=da58f90f11f597520f226caff1d3cfc115abedc9 <818f7673ed7f4a29d4b9cee8184c47d6e57162b4
  8. Affected versionversion=da58f90f11f597520f226caff1d3cfc115abedc9 <978ca6ff789f1f19c03288ac20cc1f4774e88490
  9. Affected versionversion=da58f90f11f597520f226caff1d3cfc115abedc9 <bc6002865e8c4fcf9e94975f7cf023448d8764e2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.4; version=da58f90f11f597520f226caff1d3cfc115abedc9 <175556c049eaec14efde8c6475e763b7579b9de7; version=da58f90f11f597520f226caff1d3cfc115abedc9 <1b7b6ae0e93b8d512e208b1378d74af052e4f4e7; version=da58f90f11f597520f226caff1d3cfc115abedc9 <35eaa6d8d6c2ee65e96f507add856e0eacf24591; version=da58f90f11f597520f226caff1d3cfc115abedc9 <6e2cfd0904976e701d7a76b86b694e72af230ab0; version=da58f90f11f597520f226caff1d3cfc115abedc9 <750d0091bebf44975421268d37484ef87060d263; version=da58f90f11f597520f226caff1d3cfc115abedc9 <818f7673ed7f4a29d4b9cee8184c47d6e57162b4; version=da58f90f11f597520f226caff1d3cfc115abedc9 <978ca6ff789f1f19c03288ac20cc1f4774e88490; version=da58f90f11f597520f226caff1d3cfc115abedc9 <bc6002865e8c4fcf9e94975f7cf023448d8764e2

Published CVSS scores

5.5NIST NVDCVSS: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.

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-908Use of Uninitialized Resource

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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