CVE-2011-2525

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

The qdisc_notify function in net/sched/sch_api.c in the Linux kernel before 2.6.35 does not prevent tc_fill_qdisc function calls referencing builtin (aka CQ_F_BUILTIN) Qdisc structures, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) or possibly have unspecified other impact via a crafted call.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

February 2, 2012

Last Modified

April 29, 2026

Advisory Details (4)

Auto-updated May 2, 2026
Patch available. Sources: redhat.
redhat Patch Available

720552 – (CVE-2011-2525) CVE-2011-2525 kernel: kernel: net_sched: fix qdisc_notify()

Affected: Red Hat Enterprise Linux 5.7 kernel security and bug fix update">Important: Red Hat Enterprise Linux 5.7 kernel security and b

https://bugzilla.redhat.com/show_bug.cgi?id=720552
generic
http://rhn.redhat.com/errata/RHSA-2011-1163.html
generic
http://rhn.redhat.com/errata/RHSA-2011-1065.html
generic

oss-security - CVE-2011-2525 kernel: kernel: net_sched: fix qdisc_notify()

http://openwall.com/lists/oss-security/2011/07/12/1

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-2.6.31-611-imx51 (2.6.31-611.29) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.32-36-generic (2.6.32-36.79) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.38-12-generic (2.6.38-12.51~lucid1) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.24-30-generic (2.6.24-30.96) @ hardy2026-05-29ubuntu
ubuntulinux-image-2.6.32-420-dove (2.6.32-420.38) @ maverick2026-05-29ubuntu
ubuntulinux-image-2.6.32-340-ec2 (2.6.32-340.40) @ lucid2026-05-29ubuntu
redhatkernel-0:2.6.18-238.21.1.el52011-08-16redhat
redhatkernel-0:2.6.18-274.el52011-07-21redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
Debian:5.0(1)
PackageVulnerable rangeFixed inDependents
linux-2.62.6.26-13 ... 2.6.26-26lenny3 (40 versions)2.6.26-26lenny4—
Debian:6.0(1)
PackageVulnerable rangeFixed inDependents
linux-2.62.6.32-30 ... 2.6.32-35~bpo50+1 (10 versions)2.6.32-35squeeze1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(8)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 1× in last 7d / 10× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 119 total refreshes for this CVE.

  1. 2026-08-25 13:43 UTCEPSS rescore
  2. 2026-08-19 16:58 UTCEPSS rescore
  3. 2026-08-18 13:42 UTCEPSS rescore
  4. 2026-08-15 01:25 UTCEPSS rescore
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  11. 2026-07-30 01:26 UTCEPSS rescore
  12. 2026-07-23 14:14 UTCEPSS rescore
  13. 2026-07-23 01:05 UTCEG score recompute
  14. 2026-07-23 00:09 UTCEG score recompute
  15. 2026-07-22 21:47 UTCEG score recompute
  16. 2026-07-22 14:03 UTCEPSS rescore
  17. 2026-07-21 15:21 UTCEPSS rescore
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  23. 2026-07-16 16:58 UTCEPSS rescore
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  1. 2026-07-15 01:55 UTCEPSS rescore
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  21. 2026-06-28 04:52 UTCEPSS rescore
  22. 2026-06-27 03:05 UTCEPSS rescore
  23. 2026-06-27 03:05 UTCEPSS rescore
  24. 2026-06-25 13:46 UTCEPSS rescore
  25. 2026-06-24 14:02 UTCEPSS rescore
  26. 2026-06-24 14:02 UTCEPSS rescore
  27. 2026-06-23 21:30 UTCEPSS rescore
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  31. 2026-06-21 01:56 UTCEPSS rescore
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  35. 2026-06-18 17:49 UTCEPSS rescore
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  42. 2026-06-14 23:14 UTCEPSS rescore
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  44. 2026-06-13 22:57 UTCEPSS rescore
  45. 2026-06-13 22:57 UTCEPSS rescore
  46. 2026-06-12 23:08 UTCEPSS rescore
  47. 2026-06-11 13:56 UTCEPSS rescore
  48. 2026-06-10 22:14 UTCEPSS rescore
  49. 2026-06-10 13:17 UTCEPSS rescore
  50. 2026-06-08 14:14 UTCEPSS rescore
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  52. 2026-06-07 15:22 UTCEPSS rescore
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  54. 2026-06-06 13:45 UTCEPSS rescore
  55. 2026-06-06 13:44 UTCEPSS rescore
  56. 2026-06-05 22:44 UTCEPSS rescore
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  63. 2026-06-01 13:49 UTCEPSS rescore
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  65. 2026-05-31 22:28 UTCEPSS rescore
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  67. 2026-05-31 00:14 UTCEPSS rescore
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  69. 2026-05-29 13:41 UTCEPSS rescore
  70. 2026-05-29 13:40 UTCEPSS rescore
  71. 2026-05-29 05:36 UTCEG score recompute
  72. 2026-05-29 05:36 UTCVendor advisory
  73. 2026-05-29 05:35 UTCGHSA enrichment
  74. 2026-05-28 13:42 UTCEPSS rescore
  75. 2026-05-28 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2011-2525?
CVE-2011-2525 is a high vulnerability published on February 2, 2012. The qdiscnotify function in net/sched/schapi.c in the Linux kernel before 2.6.35 does not prevent tcfillqdisc function calls referencing builtin (aka CQFBUILTIN) Qdisc structures, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) or possibly have unspecified…
When was CVE-2011-2525 disclosed?
CVE-2011-2525 was first published in the National Vulnerability Database on February 2, 2012, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-2525 actively exploited?
CVE-2011-2525 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.6% of all scored CVEs.
What is the CVSS score of CVE-2011-2525?
CVE-2011-2525 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2011-2525?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-2525, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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