CVE-2026-64413

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: zero chainstack array sashiko reports: looking at ebtables table translation, could a sparse cpu_possible_mask lead to an uninitialized pointer free? If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible, but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at CPU 2, the cleanup loop will blindly decrement and call vfree() on newinfo->chainstack[1]. Not a real-world bug, such allocation isn't expected to fail in the first place.

References

• https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8
• https://git.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311fa
• https://git.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245ef
• https://git.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6
• https://git.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088