{"id":"CVE-2026-99167","summary":"net/sched: fix use-after-free in __tcf_action_put()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix use-after-free in __tcf_action_put()\n\n__tcf_action_put() decrements the reference count before decrementing the\nbinding count. Another thread can free the action between these operations,\ncausing the binding-count update to access freed memory. KASAN reports it\nas:\n\n  BUG: KASAN: slab-use-after-free in __tcf_action_put+0x327/0x340\n  Write of size 4 at addr ff11000000d46420 by task tc-put-pause/64\n\nHold the action IDR mutex across both counter updates and IDR removal,\nkeeping cleanup outside the lock.","modified":"2026-11-02T02:35:47.802024179Z","published":"2026-10-28T10:35:18.850Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99167.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2465d27ef90de9105c2bffb6c35f8ce08918e642"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2e012e431aa271ef3c84206f48854f539c03bff0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4d83a3fc03bc595dd39b79ad61288738fbb1f2ba"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7b16eb911091aae237a8673da94e4dfb9cd21d54"},{"type":"WEB","url":"https://git.kernel.org/stable/c/969ad6f2b266f383b44194d50d15631969b26222"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fcc7d734ceccfab8ec3398c5b34f8e775d459507"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd01abed2568209f7daaf60e5ee68ae4a4744f48"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fde33eb9955d819af282d5f5e84684eaec248291"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99167.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99167"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"16af6067392c40e454e49eec834843ab03643d96"},{"fixed":"4d83a3fc03bc595dd39b79ad61288738fbb1f2ba"},{"fixed":"fd01abed2568209f7daaf60e5ee68ae4a4744f48"},{"fixed":"fcc7d734ceccfab8ec3398c5b34f8e775d459507"},{"fixed":"fde33eb9955d819af282d5f5e84684eaec248291"},{"fixed":"969ad6f2b266f383b44194d50d15631969b26222"},{"fixed":"2465d27ef90de9105c2bffb6c35f8ce08918e642"},{"fixed":"2e012e431aa271ef3c84206f48854f539c03bff0"},{"fixed":"7b16eb911091aae237a8673da94e4dfb9cd21d54"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99167.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.19.0"},{"fixed":"5.10.273"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.161"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.115"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.59"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99167.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}