CVE-2026-64413

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2ade612967e2cdfb9290ebcb773f302c82f311faaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 42bef500d07b5769d916e9122a3e3fa3fd2245efaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fc7f105451044501a50cfd530cfa3b472c54acbcaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9e6c5169db423e51dcc66a73fd15409c0d38e088affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 29bf41a9b59aff9f6197df58641a00037d567ca8affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9f74d28e903fa4fdf82f870d0aeadddc8196e41caffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5ee856e4208acafaaaf7b84824d39b78c21345d6affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cbfe53599eebffd188938ab6774cc41794f6f9d5affected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc3 <= *unaffected

Weaknesses

References