CVE-2026-64413

netfilter: ebtables: zero chainstack array

State: Published
Severity: 7.0 High
Published: Jul 25, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.0 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-457 Use of Uninitialized Variable

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2ade612967e2cdfb9290ebcb773f302c82f311faAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 42bef500d07b5769d916e9122a3e3fa3fd2245efAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before fc7f105451044501a50cfd530cfa3b472c54acbcAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9e6c5169db423e51dcc66a73fd15409c0d38e088Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 29bf41a9b59aff9f6197df58641a00037d567ca8Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9f74d28e903fa4fdf82f870d0aeadddc8196e41cAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5ee856e4208acafaaaf7b84824d39b78c21345d6Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before cbfe53599eebffd188938ab6774cc41794f6f9d5Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.39 through 6.18.Not affected 7.1.4 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2ade612967e2cdfb9290ebcb773f302c82f311faAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 42bef500d07b5769d916e9122a3e3fa3fd2245efAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before fc7f105451044501a50cfd530cfa3b472c54acbcAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9e6c5169db423e51dcc66a73fd15409c0d38e088Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 29bf41a9b59aff9f6197df58641a00037d567ca8Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9f74d28e903fa4fdf82f870d0aeadddc8196e41cAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5ee856e4208acafaaaf7b84824d39b78c21345d6Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before cbfe53599eebffd188938ab6774cc41794f6f9d5Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.39 through 6.18.*Not affected
7.1.4 through 7.1.*Not affected
7.2 and laterNot affected

References

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