7.8

CVE-2026-23270

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks

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

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks

As Paolo said earlier [1]:

"Since the blamed commit below, classify can return TC_ACT_CONSUMED while
the current skb being held by the defragmentation engine. As reported by
GangMin Kim, if such packet is that may cause a UaF when the defrag engine
later on tries to tuch again such packet."

act_ct was never meant to be used in the egress path, however some users
are attaching it to egress today [2]. Attempting to reach a middle
ground, we noticed that, while most qdiscs are not handling
TC_ACT_CONSUMED, clsact/ingress qdiscs are. With that in mind, we
address the issue by only allowing act_ct to bind to clsact/ingress
qdiscs and shared blocks. That way it's still possible to attach act_ct to
egress (albeit only with clsact).

[1] https://lore.kernel.org/netdev/674b8cbfc385c6f37fb29a1de08d8fe5c2b0fbee.1771321118.git.pabeni@redhat.com/
[2] https://lore.kernel.org/netdev/cc6bfb4a-4a2b-42d8-b9ce-7ef6644fb22b@ovn.org/
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version 172ba7d46c202e679f3ccb10264c67416aaeb1c4
Version < bc4e5bb529823a09f02dbe96169de679a9db26e0
Status affected
Version 0b5b831122fc3789fff75be433ba3e4dd7b779d4
Version < fb3c380a54e33d1fd272cc342faa906d787d7ef1
Status affected
Version 73f7da5fd124f2cda9161e2e46114915e6e82e97
Version < 5a110ddcc99bda77a28598b3555fe009eaab3828
Status affected
Version 3f14b377d01d8357eba032b4cabc8c1149b458b6
Version < 524ce8b4ea8f64900b6c52b6a28df74f6bc0801e
Status affected
Version 3f14b377d01d8357eba032b4cabc8c1149b458b6
Version < 380ad8b7c65ea7aa10ef2258297079ed5ac1f5b6
Status affected
Version 3f14b377d01d8357eba032b4cabc8c1149b458b6
Version < 9deda0fcda5c1f388c5e279541850b71a2ccfcf4
Status affected
Version 3f14b377d01d8357eba032b4cabc8c1149b458b6
Version < 11cb63b0d1a0685e0831ae3c77223e002ef18189
Status affected
Version f5346df0591d10bc948761ca854b1fae6d2ef441
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 6.8
Status affected
Version 0
Version < 6.8
Status unaffected
Version <= 5.15.*
Version 5.15.203
Status unaffected
Version <= 6.1.*
Version 6.1.167
Status unaffected
Version <= 6.6.*
Version 6.6.130
Status unaffected
Version <= 6.12.*
Version 6.12.77
Status unaffected
Version <= 6.18.*
Version 6.18.18
Status unaffected
Version <= 6.19.*
Version 6.19.8
Status unaffected
Version <= *
Version 7.0
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.02% 0.034
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.