In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix OOB in pcpu_init_value

An out-of-bounds read occurs when copying element from a
BPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the
same value_size that is not rounded up to 8 bytes.

The issue happens when:
1. A CGROUP_STORAGE map is created with value_size not aligned to
   8 bytes (e.g., 4 bytes)
2. A pcpu map is created with the same value_size (e.g., 4 bytes)
3. Update element in 2 with data in 1

pcpu_init_value assumes that all sources are rounded up to 8 bytes,
and invokes copy_map_value_long to make a data copy, However, the
assumption doesn't stand since there are some cases where the source
may not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data.
the verifier verifies exactly the size that the source claims, not
the size rounded up to 8 bytes by kernel, an OOB happens when the
source has only 4 bytes while the copy size(4) is rounded up to 8.

https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36

https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c

https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c

https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e

https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9

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