CVE-2025-71084

Service interruption via leaked multicast GID reference

Published Jan 13, 2026 · Updated Jan 13, 2026

Resource leak in the Linux kernel RDMA connection manager allows local users to interrupt service during multicast teardown. Destroying a CM ID while multicast-creation work remains queued makes cancel_work_sync() suppress the worker that would release ah_attr, leaving the multicast GID table reference held. A low-privileged local user must reach the RDMA CM multicast path and win this teardown timing window; the documented result is refcount growth and a kernel warning, with no confidentiality or integrity impact.

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

Resource leak in the Linux kernel RDMA connection manager allows local users to interrupt service during multicast teardown. Destroying a CM ID while multicast-creation work remains queued makes cancel_work_sync() suppress the worker that would release ah_attr, leaving the multicast GID table reference held. A low-privileged local user must reach the RDMA CM multicast path and win this teardown timing window; the documented result is refcount growth and a kernel warning, with no confidentiality or integrity impact.

The record

CVE
CVE-2025-71084
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 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=5.12
  2. Affected versionversion=60d613b39e8d0c9f3b526e9c96445422b4562d76
  3. Affected versionversion=a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4
  4. Affected versionversion=fe454dc31e84f8c14cb8942fcb61666c9f40745b <3ba6d01c4b3c584264dc733c6a2ecc5bbc8e0bb5
  5. Affected versionversion=fe454dc31e84f8c14cb8942fcb61666c9f40745b <57f3cb6c84159d12ba343574df2115fb18dd83ca
  6. Affected versionversion=fe454dc31e84f8c14cb8942fcb61666c9f40745b <5cb34bb5fd726491b809efbeb5cfd63ae5bf9cf3
  7. Affected versionversion=fe454dc31e84f8c14cb8942fcb61666c9f40745b <ab668a58c4a2ccb6d54add7a76f2f955d15d0196
  8. Affected versionversion=fe454dc31e84f8c14cb8942fcb61666c9f40745b <c0acdee513239e1d6e1b490f56be0e6837dfd162

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.12; version=60d613b39e8d0c9f3b526e9c96445422b4562d76; version=a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4; version=fe454dc31e84f8c14cb8942fcb61666c9f40745b <3ba6d01c4b3c584264dc733c6a2ecc5bbc8e0bb5; version=fe454dc31e84f8c14cb8942fcb61666c9f40745b <57f3cb6c84159d12ba343574df2115fb18dd83ca; version=fe454dc31e84f8c14cb8942fcb61666c9f40745b <5cb34bb5fd726491b809efbeb5cfd63ae5bf9cf3; version=fe454dc31e84f8c14cb8942fcb61666c9f40745b <ab668a58c4a2ccb6d54add7a76f2f955d15d0196; version=fe454dc31e84f8c14cb8942fcb61666c9f40745b <c0acdee513239e1d6e1b490f56be0e6837dfd162

Published CVSS scores

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

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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

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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