CVE-2026-64413 (GCVE-0-2026-64413)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-10-19 20:38
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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Although memory pressure is attacker-influenceable, these uncommon conditions are not fully attacker-controlled.\\nPR:L - The path requires CAP_NET_ADMIN in the socket network namespace, which an unprivileged user can obtain through an owned user and network namespace where unprivileged user namespaces are enabled.\\nUI:N - The attacker directly submits the crafted ebtables replacement; no victim action is required.\\nS:U - This is ordinary user-namespace-to-kernel privilege escalation within the host security authority, without crossing a VM, hypervisor, or IOMMU boundary.\\nC:H - The uninitialized slot can alias a live vmalloc allocation, causing it to be freed and leaving its owner with a groomable use-after-free capable of exposing arbitrary kernel memory.\\nI:H - Freeing a live vmalloc-backed kernel object can enable controlled reallocation, arbitrary memory modification, and kernel control-flow hijacking.\\nA:H - An invalid vfree can panic kernels configured with panic_on_warn, 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\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"29bf41a9b59aff9f6197df58641a00037d567ca8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"9f74d28e903fa4fdf82f870d0aeadddc8196e41c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"5ee856e4208acafaaaf7b84824d39b78c21345d6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"cbfe53599eebffd188938ab6774cc41794f6f9d5\", \"versionType\": \"git\"}], \"programFiles\": [\"net/bridge/netfilter/ebtables.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.97\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/bridge/netfilter/ebtables.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311fa\"}, {\"url\": \"https://git.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245ef\"}, {\"url\": \"https://git.kernel.org/stable/c/fc7f105451044501a50cfd530cfa3b472c54acbc\"}, {\"url\": \"https://git.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088\"}, {\"url\": \"https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8\"}, {\"url\": \"https://git.kernel.org/stable/c/9f74d28e903fa4fdf82f870d0aeadddc8196e41c\"}, {\"url\": \"https://git.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6\"}, {\"url\": \"https://git.kernel.org/stable/c/cbfe53599eebffd188938ab6774cc41794f6f9d5\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: ebtables: zero chainstack array\\n\\nsashiko reports:\\n looking at ebtables table\\n translation, could a sparse cpu_possible_mask lead to an uninitialized pointer\\n free?\\n\\n If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible,\\n but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at\\n CPU 2, the cleanup loop will blindly decrement and call vfree() on\\n newinfo-\u003echainstack[1].\\n\\nNot a real-world bug, such allocation isn\u0027t expected to fail\\nin the first place.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.39\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.4\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:55:12.351Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64413\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:38:27.843Z\", \"dateReserved\": \"2026-07-19T15:36:31.786Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-25T08:50:53.759Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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