CVE-2026-93174

CVE CVE-2026-93174EUVD EUVD-2026-82282Published 2026-09-17T16:12:03.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 448325199f574d33824dbf9121efb03558412966 <7cf9cd98cf6f0df3befc167ca6b54c07014d71de; 448325199f574d33824dbf9121efb03558412966 <953e85da53541a8dc3e7ad4e8532f29a34a32eae; 448325199f574d33824dbf9121efb03558412966 <5e9f69829835521aa2942d1d14bd0990fbc6991e; patch: 7.3-rc1; patch: 0; 448325199f574d33824dbf9121efb03558412966 <003bf840ed3326bd01396ce7d5b431cef0d371e7; patch: 6.18.52; patch: 6.12.110; patch: 7.2.6; 448325199f574d33824dbf9121efb03558412966 <ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef; 6.1; patch: 6.6.157

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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