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

Summary

CVECVE-2026-22999
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-25 15:15:54 UTC
Updated2026-04-27 14:16:28 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo


VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 462dbc9101acd38e92eda93c0726857517a24bbd 2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e git Not specified
CNA Linux Linux affected 462dbc9101acd38e92eda93c0726857517a24bbd cff6cd703f41d8071995956142729e4bba160363 git Not specified
CNA Linux Linux affected 462dbc9101acd38e92eda93c0726857517a24bbd f06f7635499bc806cbe2bbc8805c7cef8b1edddf git Not specified
CNA Linux Linux affected 462dbc9101acd38e92eda93c0726857517a24bbd 0a234660dc70ce45d771cbc76b20d925b73ec160 git Not specified
CNA Linux Linux affected 462dbc9101acd38e92eda93c0726857517a24bbd 362e269bb03f7076ba9990e518aeddb898232e50 git Not specified
CNA Linux Linux affected 462dbc9101acd38e92eda93c0726857517a24bbd e9d8f11652fa08c647bf7bba7dd8163241a332cd git Not specified
CNA Linux Linux affected 462dbc9101acd38e92eda93c0726857517a24bbd 3879cffd9d07aa0377c4b8835c4f64b4fb24ac78 git Not specified
CNA Linux Linux affected 3.8 Not specified
CNA Linux Linux unaffected 3.8 semver Not specified
CNA Linux Linux unaffected 5.10.249 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.199 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.162 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.122 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.67 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.7 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3879cffd9d07aa0377c4b8835c4f64b4fb24ac78 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cff6cd703f41d8071995956142729e4bba160363 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0a234660dc70ce45d771cbc76b20d925b73ec160 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e9d8f11652fa08c647bf7bba7dd8163241a332cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f06f7635499bc806cbe2bbc8805c7cef8b1edddf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/362e269bb03f7076ba9990e518aeddb898232e50 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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