{"id":"CVE-2024-40995","revision":"d4b833ab1c484b28b02867069bb6d4fe","records":[{"revision":"d4b833ab1c484b28b02867069bb6d4fe","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-40995","aliases":[],"title":"net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()\n\nsyzbot found hanging tasks waiting on rtnl_lock [1]\n\nA reproducer is available in the syzbot bug.\n\nWhen a request to add multiple actions with the same index is sent, the\nsecond request will block forever on the first request. This holds\nrtnl_lock, and causes tasks to hang.\n\nReturn -EAGAIN to prevent infinite looping, while keeping documented\nbehavior.\n\n[1]\n\nINFO: task kworker/1:0:5088 blocked for more than 143 seconds.\nNot tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0\n\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:kworker/1:0 state:D stack:23744 pid:5088 tgid:5088 ppid:2 flags:0x00004000\nWorkqueue: events_power_efficient reg_check_chans_work\nCall Trace:\n<TASK>\ncontext_switch kernel/sched/core.c:5409 [inline]\n__schedule+0xf15/0x5d00 kernel/sched/core.c:6746\n__schedule_loop kernel/sched/core.c:6823 [inline]\nschedule+0xe7/0x350 kernel/sched/core.c:6838\nschedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895\n__mutex_lock_common kernel/locking/mutex.c:684 [inline]\n__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752\nwiphy_lock include/net/cfg80211.h:5953 [inline]\nreg_leave_invalid_chans net/wireless/reg.c:2466 [inline]\nreg_check_chans_work+0x10a/0x10e0 net/wireless/reg.c:2481","state":0,"publishedAt":"2024-07-12T12:37:37.791+00:00","modifiedAt":"2026-10-15T00:46:46.332+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/act_api.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"c6a7da65a296745535a964be1019ec7691b0cb90\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"25987a97eec4d5f897cd04ee1b45170829c610da\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"6fc78d67f51aeb9a542d39a8714e16bc411582d4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"5f926aa96b08b6c47178fe1171e7ae331c695fc2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"7a0e497b597df7c4cf2b63fc6e9188b6cabe5335\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"d864319871b05fadd153e0aede4811ca7008f5d6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/act_api.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.4.279\",\n                            \"lessThanOrEqual\": \"5.4.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.221\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.162\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.96\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.36\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.9.7\",\n                            \"lessThanOrEqual\": \"6.9.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.10\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74","https://git.kernel.org/stable/c/c6a7da65a296745535a964be1019ec7691b0cb90","https://git.kernel.org/stable/c/25987a97eec4d5f897cd04ee1b45170829c610da","https://git.kernel.org/stable/c/6fc78d67f51aeb9a542d39a8714e16bc411582d4","https://git.kernel.org/stable/c/5f926aa96b08b6c47178fe1171e7ae331c695fc2","https://git.kernel.org/stable/c/7a0e497b597df7c4cf2b63fc6e9188b6cabe5335","https://git.kernel.org/stable/c/d864319871b05fadd153e0aede4811ca7008f5d6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-40995","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-40995","identifiers":["CVE-2024-40995"]},"retained":false,"historicalAffected":[]}],"coverage":[]}