CVE-2026-43030 (GCVE-0-2026-43030)
Vulnerability from cvelistv5
Published
2026-05-01 14:15
Modified
2026-10-19 19:06
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix regsafe() for pointers to packet In case rold->reg->range == BEYOND_PKT_END && rcur->reg->range == N regsafe() may return true which may lead to current state with valid packet range not being explored. Fix the bug.
References
Impacted products
Vendor Product Version
Linux Linux Version: 95b6ec733752b31bfd166c4609d2c1b5cdde9b47
Version: 6d94e741a8ff818e5518da8257f5ca0aaed1f269
Version: 6d94e741a8ff818e5518da8257f5ca0aaed1f269
Version: 6d94e741a8ff818e5518da8257f5ca0aaed1f269
Version: 6d94e741a8ff818e5518da8257f5ca0aaed1f269
Version: 6d94e741a8ff818e5518da8257f5ca0aaed1f269
Version: 6d94e741a8ff818e5518da8257f5ca0aaed1f269
Version: 6d94e741a8ff818e5518da8257f5ca0aaed1f269
Version: 5.10.155   ≤
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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\u0027s 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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"95b6ec733752b31bfd166c4609d2c1b5cdde9b47\", \"lessThan\": \"b52f6d0ef7b308f9d05bbddb78749852f28e8e40\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6d94e741a8ff818e5518da8257f5ca0aaed1f269\", \"lessThan\": \"37db6b9726d0bcf91cbdf9d63b558c50da49f968\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6d94e741a8ff818e5518da8257f5ca0aaed1f269\", \"lessThan\": \"015a74476dc1ab6923d89f1ee009aaf43faa7185\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6d94e741a8ff818e5518da8257f5ca0aaed1f269\", \"lessThan\": \"b99d82706bd1511bb875e3de7154698fd9215c99\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6d94e741a8ff818e5518da8257f5ca0aaed1f269\", \"lessThan\": \"7241da033fdc507b920e092dab1f97b945cb0370\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6d94e741a8ff818e5518da8257f5ca0aaed1f269\", \"lessThan\": \"8aebe18069394f4a79d2d82080a0f806da449996\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6d94e741a8ff818e5518da8257f5ca0aaed1f269\", \"lessThan\": \"ca995b1462ec6db1e869100ba1fb7356bd3f22f0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6d94e741a8ff818e5518da8257f5ca0aaed1f269\", \"lessThan\": \"a8502a79e832b861e99218cbd2d8f4312d62e225\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.10.155\", \"lessThan\": \"5.10.253\", \"versionType\": \"semver\"}], \"programFiles\": [\"kernel/bpf/verifier.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.253\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.203\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.134\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.81\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.22\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/bpf/verifier.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\u003ereg-\u003erange == BEYOND_PKT_END \u0026\u0026 rcur-\u003ereg-\u003erange == N\\nregsafe() may return true which may lead to current state with\\nvalid packet range not being explored. Fix the bug.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.253\", \"versionStartIncluding\": \"5.10.155\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.203\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.168\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.134\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.81\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.22\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.12\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"5.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:25:23.920Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43030\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:06:10.383Z\", \"dateReserved\": \"2026-05-01T14:12:55.977Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-01T14:15:30.564Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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