CVE-2024-35892

Local service interruption via unsafe qdisc lookup

Published May 19, 2024 · Updated May 23, 2026

Improper locking in Linux kernel 6.1.34 through 6.1.84 allows local users to interrupt service through packet scheduling. qdisc_tree_reduce_backlog() runs with only the qdisc lock held but calls qdisc_lookup(), whose protected dereference assumes RTNL; an RCU lookup is required. Exploitation requires local low-privileged access and a traffic-control path that reduces a qdisc backlog, and the bounded impact is availability loss.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux kernel 6.1.34 through 6.1.84 allows local users to interrupt service through packet scheduling. qdisc_tree_reduce_backlog() runs with only the qdisc lock held but calls qdisc_lookup(), whose protected dereference assumes RTNL; an RCU lookup is required. Exploitation requires local low-privileged access and a traffic-control path that reduces a qdisc backlog, and the bounded impact is availability loss.

The record

CVE
CVE-2024-35892
Published
May 19, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 19, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=3a4741bb13caf482b877b10ac1bcf7390cad7077
  2. Affected versionversion=6.1.34 <6.1.85
  3. Affected versionversion=6.3.8 <6.4
  4. Affected versionversion=6.4
  5. Affected versionversion=9d9a38b5639fcefacc1e977567fb4b4e4a74d0b3 <b7d1ce2cc7192e8a037faa3f5d3ba72c25976460
  6. Affected versionversion=d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb <07696415526bee0607e495017369c7303a4792e1
  7. Affected versionversion=d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb <7eb322360b0266481e560d1807ee79e0cef5742b
  8. Affected versionversion=d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb <c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3a4741bb13caf482b877b10ac1bcf7390cad7077; version=6.1.34 <6.1.85; version=6.3.8 <6.4; version=6.4; version=9d9a38b5639fcefacc1e977567fb4b4e4a74d0b3 <b7d1ce2cc7192e8a037faa3f5d3ba72c25976460; version=d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb <07696415526bee0607e495017369c7303a4792e1; version=d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb <7eb322360b0266481e560d1807ee79e0cef5742b; version=d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb <c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e

Published CVSS scores

5.5CanonicalCVSS: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

CWE-667Improper Locking
T1499Endpoint Denial of Service

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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