CVE-2026-98035
UnknownSummary
A vulnerability in the Linux kernel BPF subsystem related to rhtab maps was fixed. The functions rhtab_map_update_existing() and rhtab_delete_elem() called bpf_obj_free_fields(), which could be unsafe in NMI context. The fix uses bpf_obj_cancel_fields() to cancel only asynchronous fields, leaving referenced kptr release to the allocation destructor.
Risk Assessment
Improper release of complex fields in NMI context can lead to memory corruption or kernel instability. This affects systems using rhtab maps in BPF programs.
Recommendation
Update the Linux kernel to a version containing this fix. If you use rhtab maps in BPF programs, verify behavior after the update.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf: Cancel special fields when recycling rhtab elements rhtab_map_update_existing() and rhtab_delete_elem() call bpf_obj_free_fields() when replacing or deleting a value. These map operations can run from BPF programs in NMI context, where releasing a referenced kptr or another complex field is not generally safe. Array and hash maps avoid that problem by cancelling only the asynchronous fields which can be stopped safely in the caller context. Other ownership state remains attached to the allocation until its memory allocator destructor performs the final cleanup. Use bpf_obj_cancel_fields() for the corresponding rhtab paths as well. This cancels timers, workqueues, and task work while allowing rhtab_mem_dtor() to release referenced kptrs when the allocation is eventually destroyed. [ kkd: Rebased, used direct helper calls, and rewrote the commit log ]
Vulnerability data from NVD (NIST) · CISA KEV · EPSS