{"id":"CVE-2026-43030","state":"PUBLISHED","title":"bpf: Fix regsafe() for pointers to packet","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix regsafe() for pointers to packet\n\nIn case rold->reg->range == BEYOND_PKT_END && rcur->reg->range == N\nregsafe() may return true which may lead to current state with\nvalid packet range not being explored. Fix the bug.","publishedAt":"2026-05-01T14:15:30.564Z","updatedAt":"2026-10-19T19:06:10.383Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"95b6ec733752b31bfd166c4609d2c1b5cdde9b47","status":"affected","lessThan":"b52f6d0ef7b308f9d05bbddb78749852f28e8e40","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"37db6b9726d0bcf91cbdf9d63b558c50da49f968","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"015a74476dc1ab6923d89f1ee009aaf43faa7185","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"b99d82706bd1511bb875e3de7154698fd9215c99","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"7241da033fdc507b920e092dab1f97b945cb0370","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"8aebe18069394f4a79d2d82080a0f806da449996","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"ca995b1462ec6db1e869100ba1fb7356bd3f22f0","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"a8502a79e832b861e99218cbd2d8f4312d62e225","versionType":"git"},{"version":"5.10.155","status":"affected","lessThan":"5.10.253","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]}],"references":["https://git.kernel.org/stable/c/b52f6d0ef7b308f9d05bbddb78749852f28e8e40","https://git.kernel.org/stable/c/37db6b9726d0bcf91cbdf9d63b558c50da49f968","https://git.kernel.org/stable/c/015a74476dc1ab6923d89f1ee009aaf43faa7185","https://git.kernel.org/stable/c/b99d82706bd1511bb875e3de7154698fd9215c99","https://git.kernel.org/stable/c/7241da033fdc507b920e092dab1f97b945cb0370","https://git.kernel.org/stable/c/8aebe18069394f4a79d2d82080a0f806da449996","https://git.kernel.org/stable/c/ca995b1462ec6db1e869100ba1fb7356bd3f22f0","https://git.kernel.org/stable/c/a8502a79e832b861e99218cbd2d8f4312d62e225","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":["CWE-682"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43030.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43030","state":"PUBLISHED","datePublished":"2026-05-01T14:15:30.564Z","dateUpdated":"2026-10-19T19:06:10.383Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.977Z"},"containers":{"cna":{"title":"bpf: Fix regsafe() for pointers to packet","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix regsafe() for pointers to packet\n\nIn case rold->reg->range == BEYOND_PKT_END && rcur->reg->range == N\nregsafe() may return true which may lead to current state with\nvalid packet range not being explored. Fix the bug."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"95b6ec733752b31bfd166c4609d2c1b5cdde9b47","status":"affected","lessThan":"b52f6d0ef7b308f9d05bbddb78749852f28e8e40","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"37db6b9726d0bcf91cbdf9d63b558c50da49f968","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"015a74476dc1ab6923d89f1ee009aaf43faa7185","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"b99d82706bd1511bb875e3de7154698fd9215c99","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"7241da033fdc507b920e092dab1f97b945cb0370","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"8aebe18069394f4a79d2d82080a0f806da449996","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"ca995b1462ec6db1e869100ba1fb7356bd3f22f0","versionType":"git"},{"version":"6d94e741a8ff818e5518da8257f5ca0aaed1f269","status":"affected","lessThan":"a8502a79e832b861e99218cbd2d8f4312d62e225","versionType":"git"},{"version":"5.10.155","status":"affected","lessThan":"5.10.253","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b52f6d0ef7b308f9d05bbddb78749852f28e8e40"},{"url":"https://git.kernel.org/stable/c/37db6b9726d0bcf91cbdf9d63b558c50da49f968"},{"url":"https://git.kernel.org/stable/c/015a74476dc1ab6923d89f1ee009aaf43faa7185"},{"url":"https://git.kernel.org/stable/c/b99d82706bd1511bb875e3de7154698fd9215c99"},{"url":"https://git.kernel.org/stable/c/7241da033fdc507b920e092dab1f97b945cb0370"},{"url":"https://git.kernel.org/stable/c/8aebe18069394f4a79d2d82080a0f806da449996"},{"url":"https://git.kernel.org/stable/c/ca995b1462ec6db1e869100ba1fb7356bd3f22f0"},{"url":"https://git.kernel.org/stable/c/a8502a79e832b861e99218cbd2d8f4312d62e225"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable verifier path is reached by a local process invoking bpf(BPF_PROG_LOAD) with crafted eBPF instructions. Network packets may later exercise the loaded program, but the security boundary is crossed through a local syscall.\nAC:L - The attacker controls the BPF program and verifier state shape needed to trigger the incorrect pruning. There is no race or condition outside attacker control.\nPR:L - Packet-pointer BPF program types are reachable by users with delegated/unprivileged BPF capability or namespace/container-level BPF-related privileges in plausible deployments. This is not a real-root-only init-namespace requirement in the highest reasonable scenario.\nUI:N - No victim action is needed after the attacker can load the crafted BPF program. The verifier is invoked directly by the attacker's syscall.\nS:U - The impact is within the kernel security authority, such as local kernel privilege escalation or kernel memory corruption. It does not cross a separate scope like a VM or IOMMU boundary.\nC:H - The verifier bug can allow unchecked out-of-bounds packet memory reads in kernel context. Such verifier unsoundness is capable of exposing kernel memory and building stronger read primitives.\nI:H - Several affected packet BPF program types allow direct packet writes, so bypassing packet bounds checks can become kernel memory corruption. This is defensibly exploitable toward arbitrary write or code execution.\nA:H - Unchecked out-of-bounds packet access in kernel context can crash, oops, or panic the kernel. Even without full exploitation, a malicious loaded BPF program can cause high availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:25:23.920Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.155","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}],"providerMetadata":{"shortName":"siemens-SADP","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","dateUpdated":"2026-10-15T01:18:44.823Z"},"x_adpType":"supplier"},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-43030","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:13:43.383787Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-682","lang":"en","type":"CWE","description":"CWE-682 Incorrect Calculation"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:06:10.383Z"}}]}}}