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High severity · published Mar 25, 2026
CVE-2026-23391
netfilter: xt_CT: drop pending enqueued packets on template removal
7.8
CVSS
0.1%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_CT: drop pending enqueued packets on template removal Templates refer to objects that can go away while packets are sitting in nfqueue refer to: - helper, this can be an issue on module removal. - timeout policy, nfnetlink_cttimeout might remove it. The use of templates with zone and event cache filter are safe, since this just copies values. Flush these enqueued packets in case the template rule gets removed.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
3.4.1 before 5.10.253; 5.11 before 5.15.203; 5.16 before 6.1.167; 6.2 before 6.6.130; 6.7 before 6.12.78; 6.13 before 6.18.20; +9 more · source: NVD
LI
Linux · Linux
24de58f465165298aaa8f286b2592f0163706cfe before 55445134d42b84cb0a272e42c98d233ca65eca83; 24de58f465165298aaa8f286b2592f0163706cfe before cc57506dd66555899560b9c0f24e813f034e12ec; 24de58f465165298aaa8f286b2592f0163706cfe before d2d0bae0c9a2a17b6990a2966f5cdce0813d6256; 24de58f465165298aaa8f286b2592f0163706cfe before 63b8097cea1923fe82cd598068d0796da8c015ec; 24de58f465165298aaa8f286b2592f0163706cfe before 19a230dec6bb8928e3f96387f9085cf2c79bcef9; 24de58f465165298aaa8f286b2592f0163706cfe before cb549925875fa06dd155e49db4ac2c5044c30f9c; +3 more · source: vendor
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7; V3.1.6; V3.1.5; V3.1.7 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7; V3.1.6; V3.1.5; V3.1.7 · source: CISA
SS
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens
0 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7 · source: CISA
Affected product
KE
Kernel
Linux
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23391
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-23391
Patch
https://git.kernel.org/stable/c/19a230dec6bb8928e3f96387f9085cf2c79bcef9
Patch
https://git.kernel.org/stable/c/55445134d42b84cb0a272e42c98d233ca65eca83
Patch
https://git.kernel.org/stable/c/63b8097cea1923fe82cd598068d0796da8c015ec
Patch
https://git.kernel.org/stable/c/777d02efe3d630cca4c1b63962cec17c57711325
Patch
https://git.kernel.org/stable/c/cb549925875fa06dd155e49db4ac2c5044c30f9c
Patch
https://git.kernel.org/stable/c/cc57506dd66555899560b9c0f24e813f034e12ec
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