PT-2026-64634 · Linux · Linux

CVE-2026-64413 · Published 2026-07-25 · Updated 2026-07-25

Mitre

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.

Related Identifiers

CVE-2026-64413

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-64413 · Security Note
• https://git.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311fa · Note
• https://git.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6 · Note
• https://git.kernel.org/stable/c/9f74d28e903fa4fdf82f870d0aeadddc8196e41c · Note
• https://git.kernel.org/stable/c/cbfe53599eebffd188938ab6774cc41794f6f9d5 · Note
• https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8 · Note
• https://git.kernel.org/stable/c/fc7f105451044501a50cfd530cfa3b472c54acbc · Note
• https://git.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245ef · Note
• https://git.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088 · Note