CVE-2026-68323

Local kernel crash via unsynchronized replicast updates

Published Aug 10, 2026 · Updated Aug 10, 2026

Race condition in Linux 4.9 through 7.1.5 and 7.2 release candidates before 7.2-rc5 allows local users to crash the kernel. tipc_udp_rcast_add() and cleanup_bearer() concurrently modify ub->rcast.list with list_add_rcu() and list_del_rcu() without serialization, corrupting list links. An unprivileged local user namespace can enable a TIPC UDP replicast bearer and repeatedly race peer discovery against bearer teardown, causing a kernel BUG or panic.

CVSS severity7.8
High
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

Race condition in Linux 4.9 through 7.1.5 and 7.2 release candidates before 7.2-rc5 allows local users to crash the kernel. tipc_udp_rcast_add() and cleanup_bearer() concurrently modify ub->rcast.list with list_add_rcu() and list_del_rcu() without serialization, corrupting list links. An unprivileged local user namespace can enable a TIPC UDP replicast bearer and repeatedly race peer discovery against bearer teardown, causing a kernel BUG or panic.

The record

CVE
CVE-2026-68323
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-820, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=4.9
  2. Affected versionversion=ef20cd4dd1633987bcf46ac34ace2c8af212361f <350e592ff4e30e48ffb55e142d11a73e63f4869c
  3. Affected versionversion=ef20cd4dd1633987bcf46ac34ace2c8af212361f <d70c81001df9320d3445e664428a1d408b5ba896

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.9; version=ef20cd4dd1633987bcf46ac34ace2c8af212361f <350e592ff4e30e48ffb55e142d11a73e63f4869c; version=ef20cd4dd1633987bcf46ac34ace2c8af212361f <d70c81001df9320d3445e664428a1d408b5ba896

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-820Missing Synchronization
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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