Riskcovery

CVE-2026-22999

net/sched: sch_qfq: do not free existing class in qfq_change_class()

State
Published
Severity
7.8 High
Published
Jan 25, 2026
Updated
Oct 19, 2026
Reserved
Jan 13, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

net/sched: sch_qfq: do not free existing class in qfq_change_class()

Fixes qfq_change_class() error case.

cl->qdisc and cl should only be freed if a new class and qdisc were allocated, or we risk various UAF.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • 462dbc9101acd38e92eda93c0726857517a24bbd to before 2a64fb9b47afffeb5dbab5fd3a518e1436dcc90eAffected
  • 462dbc9101acd38e92eda93c0726857517a24bbd to before cff6cd703f41d8071995956142729e4bba160363Affected
  • 462dbc9101acd38e92eda93c0726857517a24bbd to before f06f7635499bc806cbe2bbc8805c7cef8b1edddfAffected
  • 462dbc9101acd38e92eda93c0726857517a24bbd to before 0a234660dc70ce45d771cbc76b20d925b73ec160Affected
  • 462dbc9101acd38e92eda93c0726857517a24bbd to before 362e269bb03f7076ba9990e518aeddb898232e50Affected
  • 462dbc9101acd38e92eda93c0726857517a24bbd to before e9d8f11652fa08c647bf7bba7dd8163241a332cdAffected
  • 462dbc9101acd38e92eda93c0726857517a24bbd to before 3879cffd9d07aa0377c4b8835c4f64b4fb24ac78Affected
LinuxLinux
  • 3.8Affected
  • before 3.8Not affected
  • 5.10.249 through 5.10.*Not affected
  • 5.15.199 through 5.15.*Not affected
  • 6.1.162 through 6.1.*Not affected
  • 6.6.122 through 6.6.*Not affected
  • 6.12.67 through 6.12.*Not affected
  • 6.18.7 through 6.18.*Not affected
  • 6.19 and laterNot affected

References

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