CVE-2026-23270 — Use After Free in Linux
Severity
7.8HIGHNVD
EPSS
0.0%
top 97.70%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedMar 18
Description
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, ho…
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9
Affected Packages3 packages
▶CVEListV5linux/linux0b5b831122fc3789fff75be433ba3e4dd7b779d4 — fb3c380a54e33d1fd272cc342faa906d787d7ef1+8
🔴Vulnerability Details
4OSV▶
CVE-2026-23270: 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↗2026-03-18
GHSA▶
GHSA-62jp-jvc3-7hh9: 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↗2026-03-18