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Fencer Intel
high 7.8

CVE-2011-2525 json

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 referencin…

published 2012-02-02 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2510

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

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.

Patch / fix

  • linux linux_kernel 2.6.35
  • kernel RHEL 5 2.6.18-238.21.1.el5
  • kernel-PAE RHEL 5 2.6.18-238.21.1.el5
  • kernel-xen RHEL 5 2.6.18-238.21.1.el5
  • kernel-kdump RHEL 5 2.6.18-238.21.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-238.21.1.el5
  • kernel RHEL 5 2.6.18-274.el5
  • kernel-PAE RHEL 5 2.6.18-274.el5
  • kernel-xen RHEL 5 2.6.18-274.el5

red hat advisories RHSA-2011:1163RHSA-2011:1065

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-2525 updated cvss 4.9

kernel: kernel: net_sched: fix qdisc_notify()

  • Red Hat Enterprise Linux 4 kernel
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-274.el5, kernel-PAE 2.6.18-274.el5, kernel-xen 2.6.18-274.el5, kernel-kdump 2.6.18-274.el5, kernel-debuginfo-common 2.6.18-274.el5
    fixed: vendor fix RHSA-2011:1065
  • Red Hat Enterprise Linux (v. 5.6.z server) kernel 2.6.18-238.21.1.el5, kernel-PAE 2.6.18-238.21.1.el5, kernel-xen 2.6.18-238.21.1.el5, kernel-kdump 2.6.18-238.21.1.el5, kernel-debuginfo-common 2.6.18-238.21.1.el5
    fixed: vendor fix RHSA-2011:1163
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-274.el5, kernel-PAE 2.6.18-274.el5, kernel-xen 2.6.18-274.el5, kernel-debuginfo-common 2.6.18-274.el5
    fixed: vendor fix RHSA-2011:1065
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.