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Review reviewHigh

CVE-2026-64413

Linux

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.

CVSS
7
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7

Vulnerability overview

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 product and versions

Product
Linux
Affected versions
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2ade612967e2cdfb9290ebcb773f302c82f311fa, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 42bef500d07b5769d916e9122a3e3fa3fd2245ef, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fc7f105451044501a50cfd530cfa3b472c54acbc, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9e6c5169db423e51dcc66a73fd15409c0d38e088, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 29bf41a9b59aff9f6197df58641a00037d567ca8, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9f74d28e903fa4fdf82f870d0aeadddc8196e41c, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5ee856e4208acafaaaf7b84824d39b78c21345d6, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cbfe53599eebffd188938ab6774cc41794f6f9d5, >= 2.6.12
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available