{"id":"CVE-2026-99167","state":"PUBLISHED","title":"net/sched: fix use-after-free in __tcf_action_put()","description":"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.","publishedAt":"2026-10-28T10:35:18.850Z","updatedAt":"2026-10-30T12:42:33.649Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"4d83a3fc03bc595dd39b79ad61288738fbb1f2ba","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"fd01abed2568209f7daaf60e5ee68ae4a4744f48","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"fcc7d734ceccfab8ec3398c5b34f8e775d459507","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"fde33eb9955d819af282d5f5e84684eaec248291","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"969ad6f2b266f383b44194d50d15631969b26222","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"2465d27ef90de9105c2bffb6c35f8ce08918e642","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"2e012e431aa271ef3c84206f48854f539c03bff0","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"7b16eb911091aae237a8673da94e4dfb9cd21d54","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/act_api.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.161","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.115","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/act_api.c"]}],"references":["https://git.kernel.org/stable/c/4d83a3fc03bc595dd39b79ad61288738fbb1f2ba","https://git.kernel.org/stable/c/fd01abed2568209f7daaf60e5ee68ae4a4744f48","https://git.kernel.org/stable/c/fcc7d734ceccfab8ec3398c5b34f8e775d459507","https://git.kernel.org/stable/c/fde33eb9955d819af282d5f5e84684eaec248291","https://git.kernel.org/stable/c/969ad6f2b266f383b44194d50d15631969b26222","https://git.kernel.org/stable/c/2465d27ef90de9105c2bffb6c35f8ce08918e642","https://git.kernel.org/stable/c/2e012e431aa271ef3c84206f48854f539c03bff0","https://git.kernel.org/stable/c/7b16eb911091aae237a8673da94e4dfb9cd21d54"],"weaknesses":[],"ingestedAt":"2026-10-30T13:02:04.640Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99167.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99167","state":"PUBLISHED","datePublished":"2026-10-28T10:35:18.850Z","dateUpdated":"2026-10-30T12:42:33.649Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.398Z"},"containers":{"cna":{"title":"net/sched: fix use-after-free in __tcf_action_put()","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"4d83a3fc03bc595dd39b79ad61288738fbb1f2ba","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"fd01abed2568209f7daaf60e5ee68ae4a4744f48","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"fcc7d734ceccfab8ec3398c5b34f8e775d459507","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"fde33eb9955d819af282d5f5e84684eaec248291","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"969ad6f2b266f383b44194d50d15631969b26222","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"2465d27ef90de9105c2bffb6c35f8ce08918e642","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"2e012e431aa271ef3c84206f48854f539c03bff0","versionType":"git"},{"version":"16af6067392c40e454e49eec834843ab03643d96","status":"affected","lessThan":"7b16eb911091aae237a8673da94e4dfb9cd21d54","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/act_api.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.161","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.115","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/act_api.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4d83a3fc03bc595dd39b79ad61288738fbb1f2ba"},{"url":"https://git.kernel.org/stable/c/fd01abed2568209f7daaf60e5ee68ae4a4744f48"},{"url":"https://git.kernel.org/stable/c/fcc7d734ceccfab8ec3398c5b34f8e775d459507"},{"url":"https://git.kernel.org/stable/c/fde33eb9955d819af282d5f5e84684eaec248291"},{"url":"https://git.kernel.org/stable/c/969ad6f2b266f383b44194d50d15631969b26222"},{"url":"https://git.kernel.org/stable/c/2465d27ef90de9105c2bffb6c35f8ce08918e642"},{"url":"https://git.kernel.org/stable/c/2e012e431aa271ef3c84206f48854f539c03bff0"},{"url":"https://git.kernel.org/stable/c/7b16eb911091aae237a8673da94e4dfb9cd21d54"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:42:33.649Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.161"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.12.115"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}