CVE-2026-43028 (GCVE-0-2026-43028)
Vulnerability from cvelistv5
Published
2026-05-01 14:15
Modified
2026-08-05 12:25
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: ensure names are nul-terminated Reject names that lack a \0 character before feeding them to functions that expect c-strings. Fixes tag is the most recent commit that needs this change.
References
Impacted products
Vendor Product Version
Linux Linux Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: ensure names are nul-terminated\n\nReject names that lack a \\0 character before feeding them\nto functions that expect c-strings.\n\nFixes tag is the most recent commit that needs this change."
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            "version": "3.1"
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              "value": "AV:L - The vulnerable x_tables match validation is reached by local rule creation paths such as iptables setsockopt table replacement or nft_compat netlink rule creation, not by received network packets.\nAC:L - A local attacker can deterministically submit a crafted match blob with a non-NUL-terminated cgroup path or rateest name; no race or victim state is required.\nPR:L - The path requires CAP_NET_ADMIN in the target network namespace, but netfilter administration is reachable by an unprivileged user through user and network namespaces on systems allowing unprivileged user namespaces.\nUI:N - After obtaining the local namespace privileges, the attacker directly invokes the rule insertion path without any victim action.\nS:U - The issue affects kernel netfilter processing within the same host kernel security authority and does not cross a VM, hypervisor, or separate security scope boundary.\nC:H - The bug feeds attacker-controlled fixed-size fields lacking a NUL terminator into C-string consumers, and affected kernels can read past the intended match field into adjacent kernel memory until a NUL is found. Because this out-of-bounds read is not strictly bounded to only a few bytes across affected versions, confidentiality is scored High.\nI:N - The investigated paths show an out-of-bounds read/string validation failure during rule validation, with no write primitive or control-flow modification identified.\nA:H - The unterminated C-string scan can run beyond the allocated rule data and fault or oops the kernel, producing a local denial of service that can be triggered repeatedly."
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          "url": "https://git.kernel.org/stable/c/aa6cd4a8863391e0a64f62d8922cb0af732a2cf2"
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          "url": "https://git.kernel.org/stable/c/c2d4a3abb15ca14716c6d8b9ffcbcd7c63626af4"
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      "title": "netfilter: x_tables: ensure names are nul-terminated",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43028",
    "datePublished": "2026-05-01T14:15:29.192Z",
    "dateReserved": "2026-05-01T14:12:55.976Z",
    "dateUpdated": "2026-08-05T12:25:21.789Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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