{"id":"CVE-2026-74335","summary":"bpf: Fix NULL pointer dereference in bpf_task_from_vpid()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix NULL pointer dereference in bpf_task_from_vpid()\n\nbpf_task_from_vpid() looks up a task in the pid namespace of the\ncurrent task, via find_task_by_vpid():\n\n  find_task_by_vpid(vpid)\n    find_task_by_pid_ns(vpid, task_active_pid_ns(current))\n      find_pid_ns(nr, ns) -\u003e idr_find(&ns-\u003eidr, nr)\n\ncgroup_skb programs run in softirq, which may interrupt a task that is\nitself in do_exit(). Once that task has passed\nexit_notify() -\u003e release_task() -\u003e __unhash_process(), its thread_pid is\ncleared, so task_active_pid_ns(current) returns NULL and find_pid_ns()\ndereferences &NULL-\u003eidr:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000050\n  RIP: 0010:idr_find+0x11/0x30 lib/idr.c:176\n  Call Trace:\n   \u003cIRQ\u003e\n   find_pid_ns kernel/pid.c:370 [inline]\n   find_task_by_pid_ns+0x3b/0xe0 kernel/pid.c:485\n   bpf_task_from_vpid+0x5b/0x200 kernel/bpf/helpers.c:2916\n   bpf_prog_run_array_cg+0x17e/0x530 kernel/bpf/cgroup.c:81\n   __cgroup_bpf_run_filter_skb+0x12b/0x250 kernel/bpf/cgroup.c:1612\n   sk_filter_trim_cap+0x1dc/0x4c0 net/core/filter.c:148\n   tcp_v4_rcv+0x18d1/0x2200 net/ipv4/tcp_ipv4.c:2223\n   \u003c/IRQ\u003e\n   \u003cTASK\u003e\n   do_exit+0xa63/0x1270 kernel/exit.c:1010\n   get_signal+0x141c/0x1530 kernel/signal.c:3037\n\nBail out when current has no pid namespace.","modified":"2026-08-16T03:48:34.937427392Z","published":"2026-08-15T05:58:27.148Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74335.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/50dff00615522f3ec03449680ca23beb4cfc549c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a4c95b6221cb2972a94ed72663c09bd5b0b6dea4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b7474f4432dd9559ada03b01a8cd3472cd02c61d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74335.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74335"},{"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":"675c3596ff32c040d1dd2e28dd57e83e634b9f60"},{"fixed":"b7474f4432dd9559ada03b01a8cd3472cd02c61d"},{"fixed":"a4c95b6221cb2972a94ed72663c09bd5b0b6dea4"},{"fixed":"50dff00615522f3ec03449680ca23beb4cfc549c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74335.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74335.json"}}],"schema_version":"1.9.0"}