CVE-2026-22999 (GCVE-0-2026-22999)

Vulnerability from cvelistv5 – Published: 2026-01-25 14:36 – Updated: 2026-05-11 21:58
VLAI?
Title
net/sched: sch_qfq: do not free existing class in qfq_change_class()
Summary
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.
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < cff6cd703f41d8071995956142729e4bba160363 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < f06f7635499bc806cbe2bbc8805c7cef8b1edddf (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 0a234660dc70ce45d771cbc76b20d925b73ec160 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 362e269bb03f7076ba9990e518aeddb898232e50 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < e9d8f11652fa08c647bf7bba7dd8163241a332cd (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 3879cffd9d07aa0377c4b8835c4f64b4fb24ac78 (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.67 , ≤ 6.12.* (semver)
Unaffected: 6.18.7 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.