Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix sleepable check for tracing/lsm prog When CONFIG_FUNCTION_ERROR_INJECTION is disabled, a sleepable tracing prog is allowed to attach to '__x64_'-alike prefix symbols. It is because the verifier does not verify whether the symbol is a kernel function or a bpf prog. That said, a sleepable tracing prog is allowed to attach to a bpf prog target whose name has '__x64_'-alike prefix. For example, a sleepable fentry prog attaches to a '__x64_sys_nop' XDP prog, and copies buffer from a user pointer with bpf_copy_from_user() helper. After attaching the XDP prog to lo interface, the kernel BUG could be triggered by 'ping -c 1 -W 1 127.0.0.1': [ 3.460756] BUG: sleeping function called from invalid context at kernel/bpf/trampoline.c:1324 Fix it by disallowing sleepable prog always when its target btf is not a kernel's btf.
References
- https://git.kernel.org/stable/c/00244bdaa423d93f4571f3f6854378ce3365e524
- https://git.kernel.org/stable/c/976f1be72740cfbc351d3841fd21186dda3ea723
FAQ
What is CVE-2026-90299?
CVE-2026-90299 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: bpf: Fix sleepable check for tracing/lsm prog When CONFIG_FUNCTION_ERROR_INJECTION is disabled, a sleepable tracing prog is allowe...
How severe is CVE-2026-90299?
CVSS scoring is not yet available for CVE-2026-90299. Check NVD for updates.
Is there a patch for CVE-2026-90299?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.