CVE-2026-93174
UnknownSummary
In the Linux kernel's BPF subsystem, copy_map_value_long() failed to copy the padding between map->value_size and round_up(map->value_size, 8) for per-CPU maps. As a result, UAPI LOOKUP_ELEM paths could return stale heap contents to user space.
Risk Assessment
Leakage of stale kernel heap data to user space may expose sensitive information. Affects per-CPU BPF maps, including bpf_iter.
Recommendation
Update the Linux kernel to a version with the fix that passes round_up(map->value_size, 8) to bpf_obj_memcpy(). Restrict BPF operations for unprivileged users.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf: Copy per-CPU map value padding in copy_map_value_long() In kernel, per-CPU map elements are stored with round_up(map->value_size, 8) bytes. On UAPI lookup paths, it copies the rounded size for each CPU into a temporary buffer. However, copy_map_value_long() passes 'map->value_size' to bpf_obj_memcpy(). When the map has special fields, bpf_obj_memcpy() copies around those fields with memcpy(), and does not copy the tail padding between 'map->value_size' and round_up(map->value_size, 8). The temporary UAPI lookup buffers are allocated without __GFP_ZERO. As a result, when the per-CPU map's value size is not equal to round_up(map->value_size, 8), UAPI LOOKUP_ELEM and its variants can return stale heap contents from that padding to user space. The same issue applies to bpf_iter for per-CPU maps. Pass round_up(map->value_size, 8) to bpf_obj_memcpy() from copy_map_value_long(), so per-CPU maps both with and without special fields copy the entire per-CPU slot. Remove the now redundant round_up() from bpf_obj_memcpy()'s long_memcpy path.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS