{"id":"CVE-2026-98058","summary":"bpf: Mark syscall helpers as sleepable","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Mark syscall helpers as sleepable\n\nbpf_sys_bpf() executes the bpf(2) syscall body, which can take mutexes,\nallocate with GFP_KERNEL, and wait for an RCU grace period.\nbpf_sys_close() reaches close_fd() and filp_close(), which can sleep as\nwell.\n\nBoth helpers are limited to BPF_PROG_TYPE_SYSCALL, whose main program is\nsleepable. That does not make every callback sleepable: a syscall program\ncan register a bpf_timer callback, and the verifier checks that callback\nin a non-sleepable context while retaining the syscall helper set.\n\nWithout .might_sleep on the prototypes, such a callback can invoke\nbpf_sys_bpf() from hrtimer softirq context and trigger a\nscheduling-while-atomic failure. bpf_sys_close() is exposed through the\nsame missing context check.\n\nSet .might_sleep on both prototypes so the existing helper-context check\nrejects them from timer callbacks and other atomic regions. Calls from the\nsleepable main body remain valid.","modified":"2026-09-26T03:48:32.312668885Z","published":"2026-09-25T10:24:04.190Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98058.json"},"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/3408e98f06ce06ea6a58ca6c39da9c23f0029c06"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d05524794240b52fdc3b6c1220dd05505715824d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98058.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98058"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"79a7f8bdb159d9914b58740f3d31d602a6e4aca8"},{"fixed":"3408e98f06ce06ea6a58ca6c39da9c23f0029c06"},{"fixed":"d05524794240b52fdc3b6c1220dd05505715824d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98058.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.14.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98058.json"}}],"schema_version":"1.9.0"}