Bug 2432667 (CVE-2026-22999) - CVE-2026-22999 kernel: net/sched: sch_qfq: do not free existing class in qfq_change_class()
Summary: CVE-2026-22999 kernel: net/sched: sch_qfq: do not free existing class in qfq_...
Keywords:
Status: NEW
Alias: CVE-2026-22999
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-25 15:02 UTC by OSIDB Bzimport
Modified: 2026-01-26 18:14 UTC (History)
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Description OSIDB Bzimport 2026-01-25 15:02:14 UTC 
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.
Comment 1 Alexander B 2026-01-26 09:06:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026012533-CVE-2026-22999-c098@gregkh/T
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