{"id":"CVE-2026-23105","title":"net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag\n\nThis is more of a preventive patch to make the code more consistent and\nto prev…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < fac2c67bb2bb732eae4283e45fc338af7e08c254","Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < b8c24cf5268fb3bfb8d16324c3dbb985f698c835","Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < f27047abf7cac1b6f90c3ad60de21ef9f717c26d","Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < 93b8635974fb050c43d07e35e5edfe6e685ca28a","Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < abd9fc26ea577561a5ef6241a1b058755ffdad0c","Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < 77f1afd0bb4d5da95236f6114e6d0dfcde187ff6","Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < d837fbee92453fbb829f950c8e7cf76207d73f33","Linux 3.8"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-06-16T20:18:58.725662Z"},"published":"2026-02-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T18:25:31.225Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23105","references":[{"url":"https://git.kernel.org/stable/c/fac2c67bb2bb732eae4283e45fc338af7e08c254"},{"url":"https://git.kernel.org/stable/c/b8c24cf5268fb3bfb8d16324c3dbb985f698c835"},{"url":"https://git.kernel.org/stable/c/f27047abf7cac1b6f90c3ad60de21ef9f717c26d"},{"url":"https://git.kernel.org/stable/c/93b8635974fb050c43d07e35e5edfe6e685ca28a"},{"url":"https://git.kernel.org/stable/c/abd9fc26ea577561a5ef6241a1b058755ffdad0c"},{"url":"https://git.kernel.org/stable/c/77f1afd0bb4d5da95236f6114e6d0dfcde187ff6"},{"url":"https://git.kernel.org/stable/c/d837fbee92453fbb829f950c8e7cf76207d73f33"}],"tags":["cve.org"],"epss":0.00141,"epssPercentile":0.03063,"ingestedAt":"2026-10-19T18:35:50.103Z","slug":"CVE-2026-23105","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag\n\nThis is more of a preventive patch to make the code more consistent and\nto prevent possible exploits that employ child qlen manipulations on qfq.\nuse cl_is_active instead of relying on the child qdisc's qlen to determine\nclass activation.\n\n## Affected\n\n- `Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < fac2c67bb2bb732eae4283e45fc338af7e08c254`\n- `Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < b8c24cf5268fb3bfb8d16324c3dbb985f698c835`\n- `Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < f27047abf7cac1b6f90c3ad60de21ef9f717c26d`\n- `Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < 93b8635974fb050c43d07e35e5edfe6e685ca28a`\n- `Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < abd9fc26ea577561a5ef6241a1b058755ffdad0c`\n- `Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < 77f1afd0bb4d5da95236f6114e6d0dfcde187ff6`\n- `Linux >= 462dbc9101acd38e92eda93c0726857517a24bbd < d837fbee92453fbb829f950c8e7cf76207d73f33`\n- `Linux 3.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}