{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43028","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:55.976Z","datePublished":"2026-05-01T14:15:29.192Z","dateUpdated":"2026-09-08T08:48:33.438Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:25:21.789Z"},"descriptions":[{"lang":"en","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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/xt_cgroup.c","net/netfilter/xt_rateest.c"],"versions":[{"version":"c38c4597e4bf3e99860eac98211748e1ecb0e139","lessThan":"bcac50ea0a29d430eedc5ac87b215393b567baa9","status":"affected","versionType":"git"},{"version":"c38c4597e4bf3e99860eac98211748e1ecb0e139","lessThan":"ea01c1b219f5a11c66918abaa6f052e5a74041d6","status":"affected","versionType":"git"},{"version":"c38c4597e4bf3e99860eac98211748e1ecb0e139","lessThan":"aa6cd4a8863391e0a64f62d8922cb0af732a2cf2","status":"affected","versionType":"git"},{"version":"c38c4597e4bf3e99860eac98211748e1ecb0e139","lessThan":"c2d4a3abb15ca14716c6d8b9ffcbcd7c63626af4","status":"affected","versionType":"git"},{"version":"c38c4597e4bf3e99860eac98211748e1ecb0e139","lessThan":"673bbd36cba21d10a10f0932f479df7468e26fbb","status":"affected","versionType":"git"},{"version":"c38c4597e4bf3e99860eac98211748e1ecb0e139","lessThan":"f419bdc205894750f4d3ec042bc87a1b9cde1351","status":"affected","versionType":"git"},{"version":"c38c4597e4bf3e99860eac98211748e1ecb0e139","lessThan":"73124608172890306b85f2206d8b3cac20e324f1","status":"affected","versionType":"git"},{"version":"c38c4597e4bf3e99860eac98211748e1ecb0e139","lessThan":"a958a4f90ddd7de0800b33ca9d7b886b7d40f74e","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/xt_cgroup.c","net/netfilter/xt_rateest.c"],"versions":[{"version":"4.5","status":"affected"},{"version":"0","lessThan":"4.5","status":"unaffected","versionType":"semver"},{"version":"5.10.253","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.168","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.134","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.81","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.22","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.12","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/bcac50ea0a29d430eedc5ac87b215393b567baa9"},{"url":"https://git.kernel.org/stable/c/ea01c1b219f5a11c66918abaa6f052e5a74041d6"},{"url":"https://git.kernel.org/stable/c/aa6cd4a8863391e0a64f62d8922cb0af732a2cf2"},{"url":"https://git.kernel.org/stable/c/c2d4a3abb15ca14716c6d8b9ffcbcd7c63626af4"},{"url":"https://git.kernel.org/stable/c/673bbd36cba21d10a10f0932f479df7468e26fbb"},{"url":"https://git.kernel.org/stable/c/f419bdc205894750f4d3ec042bc87a1b9cde1351"},{"url":"https://git.kernel.org/stable/c/73124608172890306b85f2206d8b3cac20e324f1"},{"url":"https://git.kernel.org/stable/c/a958a4f90ddd7de0800b33ca9d7b886b7d40f74e"}],"title":"netfilter: 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