CVE-2026-46168

Local kernel panic via unsafe timestamp locking

Published May 28, 2026 · Updated May 28, 2026

Denial of service in Linux Kernel allows local users to panic an affected system through MPTCP timestamp socket options. The MPTCP timestamp-option path holds lock_sock_fast() in atomic context while calling sock_set_timestamp() or sock_set_timestamping(), which can sleep. A low-privilege local user able to set timestamp options on an MPTCP socket can cause an atomic-scheduling panic that interrupts the entire host.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux Kernel allows local users to panic an affected system through MPTCP timestamp socket options. The MPTCP timestamp-option path holds lock_sock_fast() in atomic context while calling sock_set_timestamp() or sock_set_timestamping(), which can sleep. A low-privilege local user able to set timestamp options on an MPTCP socket can cause an atomic-scheduling panic that interrupts the entire host.

The record

CVE
CVE-2026-46168
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=5.14
  2. Affected versionversion=9061f24bf82ec2e92dd1e7c10b98b680db023d31 <7eb513b42721bee4b96da69f6188d5a7783f210d
  3. Affected versionversion=9061f24bf82ec2e92dd1e7c10b98b680db023d31 <8a005fe451c73fd2b3d1faa5643c11e6bd07acfc
  4. Affected versionversion=9061f24bf82ec2e92dd1e7c10b98b680db023d31 <b157dab93a7af44a84e78cf0cb311dde475cff5b
  5. Affected versionversion=9061f24bf82ec2e92dd1e7c10b98b680db023d31 <b5c52908d52c6c8eb8933264aa6087a0600fd892
  6. Affected versionversion=9061f24bf82ec2e92dd1e7c10b98b680db023d31 <ebeb70e29e37cfce899309cc2665a3bfe960ed94

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.14; version=9061f24bf82ec2e92dd1e7c10b98b680db023d31 <7eb513b42721bee4b96da69f6188d5a7783f210d; version=9061f24bf82ec2e92dd1e7c10b98b680db023d31 <8a005fe451c73fd2b3d1faa5643c11e6bd07acfc; version=9061f24bf82ec2e92dd1e7c10b98b680db023d31 <b157dab93a7af44a84e78cf0cb311dde475cff5b; version=9061f24bf82ec2e92dd1e7c10b98b680db023d31 <b5c52908d52c6c8eb8933264aa6087a0600fd892; version=9061f24bf82ec2e92dd1e7c10b98b680db023d31 <ebeb70e29e37cfce899309cc2665a3bfe960ed94

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.

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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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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