{"id":"CVE-2026-90299","summary":"bpf: Fix sleepable check for tracing/lsm prog","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix sleepable check for tracing/lsm prog\n\nWhen CONFIG_FUNCTION_ERROR_INJECTION is disabled, a sleepable tracing prog\nis allowed to attach to '__x64_'-alike prefix symbols.\n\nIt is because the verifier does not verify whether the symbol is a kernel\nfunction or a bpf prog. That said, a sleepable tracing prog is allowed to\nattach to a bpf prog target whose name has '__x64_'-alike prefix.\n\nFor example, a sleepable fentry prog attaches to a '__x64_sys_nop' XDP\nprog, and copies buffer from a user pointer with bpf_copy_from_user()\nhelper. After attaching the XDP prog to lo interface, the kernel BUG\ncould be triggered by 'ping -c 1 -W 1 127.0.0.1':\n\n[    3.460756] BUG: sleeping function called from invalid context at kernel/bpf/trampoline.c:1324\n\nFix it by disallowing sleepable prog always when its target\nbtf is not a kernel's btf.","modified":"2026-09-18T03:48:37.098388214Z","published":"2026-09-17T16:08:23.888Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90299.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/00244bdaa423d93f4571f3f6854378ce3365e524"},{"type":"WEB","url":"https://git.kernel.org/stable/c/976f1be72740cfbc351d3841fd21186dda3ea723"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90299.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90299"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"16d9c5660692d6f0e6aba367274de2b6dfd4343c"},{"fixed":"976f1be72740cfbc351d3841fd21186dda3ea723"},{"fixed":"00244bdaa423d93f4571f3f6854378ce3365e524"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90299.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.1.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90299.json"}}],"schema_version":"1.9.0"}