CVE-2026-98058
UnknownSummary
In the Linux kernel, bpf_sys_bpf() and bpf_sys_close() can sleep (e.g., via mutexes, GFP_KERNEL allocations, waiting for an RCU grace period), but they lack .might_sleep on their prototypes. They are limited to BPF_PROG_TYPE_SYSCALL, whose main program is sleepable, but a bpf_timer callback registered by a syscall program is checked in a non-sleepable context. Such a callback can invoke bpf_sys_bpf() from hrtimer softirq context and trigger a scheduling-while-atomic failure. The fix sets .might_sleep on both prototypes.
Risk Assessment
A local attacker with CAP_BPF privileges can trigger a scheduling-while-atomic failure, leading to a kernel crash or panic. The risk is moderate but can cause denial of service.
Recommendation
Update the Linux kernel to a version containing the fix. Until the update, restrict BPF access (CAP_BPF) to trusted users only.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf: Mark syscall helpers as sleepable bpf_sys_bpf() executes the bpf(2) syscall body, which can take mutexes, allocate with GFP_KERNEL, and wait for an RCU grace period. bpf_sys_close() reaches close_fd() and filp_close(), which can sleep as well. Both helpers are limited to BPF_PROG_TYPE_SYSCALL, whose main program is sleepable. That does not make every callback sleepable: a syscall program can register a bpf_timer callback, and the verifier checks that callback in a non-sleepable context while retaining the syscall helper set. Without .might_sleep on the prototypes, such a callback can invoke bpf_sys_bpf() from hrtimer softirq context and trigger a scheduling-while-atomic failure. bpf_sys_close() is exposed through the same missing context check. Set .might_sleep on both prototypes so the existing helper-context check rejects them from timer callbacks and other atomic regions. Calls from the sleepable main body remain valid.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS