CVE-2026-97985Public exploitHinoki check available

CPU denial of service via stale skb marker

Published Sep 25, 2026 · Updated Sep 25, 2026

Denial of service in the Linux kernel allows local users to hog CPU through a blocking AF_UNIX socket receive using MSG_PEEK. The manage_oob() path skips an out-of-band skb and returns NULL without refreshing the last-skb marker, so unix_stream_data_wait() returns immediately and the receive loop busy-waits. A local process must create an AF_UNIX stream socket and arrange the required MSG_OOB and MSG_PEEK sequence; the receiving thread consumes CPU without crashing the kernel.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in the Linux kernel allows local users to hog CPU through a blocking AF_UNIX socket receive using MSG_PEEK. The manage_oob() path skips an out-of-band skb and returns NULL without refreshing the last-skb marker, so unix_stream_data_wait() returns immediately and the receive loop busy-waits. A local process must create an AF_UNIX stream socket and arrange the required MSG_OOB and MSG_PEEK sequence; the receiving thread consumes CPU without crashing the kernel.

The record

CVE
CVE-2026-97985
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=022d81a709cd553bbe2db8675f8e824f4aee6284
  2. Affected versionversion=16dc252e7007547a7b72a2c21022ef81fb45e6a3
  3. Affected versionversion=22dd70eb2c3d754862964377a75abafd3167346b <0630bfc773d85ac44da05b2c5a037dbbd39301ab
  4. Affected versionversion=22dd70eb2c3d754862964377a75abafd3167346b <94fd4debd2e3a69cf93e766c8b328a810c228119
  5. Affected versionversion=22dd70eb2c3d754862964377a75abafd3167346b <f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa
  6. Affected versionversion=22dd70eb2c3d754862964377a75abafd3167346b <fc62a26493a98a0424d9dae2eb92a1daa1321f65
  7. Affected versionversion=5.15.157 <5.16
  8. Affected versionversion=6.1.88 <6.2
  9. Affected versionversion=6.6.29 <6.7
  10. Affected versionversion=6.8.8 <6.9
  11. Affected versionversion=6.9
  12. Affected versionversion=ae3f9e1221b31b18dbd4c4b85d08574996bbd973
  13. Affected versionversion=ba0db4638525b8b054b3d546b45f7e473f477027

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=022d81a709cd553bbe2db8675f8e824f4aee6284; version=16dc252e7007547a7b72a2c21022ef81fb45e6a3; version=22dd70eb2c3d754862964377a75abafd3167346b <0630bfc773d85ac44da05b2c5a037dbbd39301ab; version=22dd70eb2c3d754862964377a75abafd3167346b <94fd4debd2e3a69cf93e766c8b328a810c228119; version=22dd70eb2c3d754862964377a75abafd3167346b <f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa; version=22dd70eb2c3d754862964377a75abafd3167346b <fc62a26493a98a0424d9dae2eb92a1daa1321f65; version=5.15.157 <5.16; version=6.1.88 <6.2; version=6.6.29 <6.7; version=6.8.8 <6.9; version=6.9; version=ae3f9e1221b31b18dbd4c4b85d08574996bbd973; version=ba0db4638525b8b054b3d546b45f7e473f477027

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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