137 lines
7.4 KiB
JSON
137 lines
7.4 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-43070",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-01T14:12:55.982Z",
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"datePublished": "2026-05-05T15:23:28.819Z",
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"dateUpdated": "2026-08-05T12:25:43.557Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:25:43.557Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reset register ID for BPF_END value tracking\n\nWhen a register undergoes a BPF_END (byte swap) operation, its scalar\nvalue is mutated in-place. If this register previously shared a scalar ID\nwith another register (e.g., after an `r1 = r0` assignment), this tie must\nbe broken.\n\nCurrently, the verifier misses resetting `dst_reg->id` to 0 for BPF_END.\nConsequently, if a conditional jump checks the swapped register, the\nverifier incorrectly propagates the learned bounds to the linked register,\nleading to false confidence in the linked register's value and potentially\nallowing out-of-bounds memory accesses.\n\nFix this by explicitly resetting `dst_reg->id` to 0 in the BPF_END case\nto break the scalar tie, similar to how BPF_NEG handles it via\n`__mark_reg_known`."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable verifier logic is reached by a local attacker through the bpf() syscall when loading an eBPF program, not by remote packets directly.\nAC:L - The attacker controls the BPF bytecode and can construct the shared scalar-ID plus BPF_END pattern; there is no race or external timing condition required beyond program execution.\nPR:L - A basic local user can reach this in deployments with unprivileged BPF enabled or delegated BPF token capability; if uncertain between requiring CAP_BPF and unprivileged reachability, the higher-severity PR:L is appropriate.\nUI:N - No victim action is required; the attacker loads and triggers the BPF program themselves.\nS:U - The impact is within the kernel security authority, matching a standard local kernel privilege escalation rather than a cross-scope escape.\nC:H - The verifier can incorrectly validate out-of-bounds memory accesses, and such memory corruption/read primitives can expose arbitrary kernel memory.\nI:H - The demonstrated bad bounds propagation permits out-of-bounds writes through BPF pointer arithmetic, which is defensibly exploitable for kernel memory corruption or code execution.\nA:H - Out-of-bounds kernel memory access can crash or panic the kernel even if not fully exploited."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/bpf/verifier.c"
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],
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"versions": [
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{
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"version": "4c03342e5ac532fb34d13a7b51dd7261dfc48963",
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"lessThan": "a17443af874229408ce6b78e2c8a2b5adeb4b7d8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d00ce96623a69a100ad79675d0e85fda3c50d89b",
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"lessThan": "0d15c3611a2cc5d08993545d4032055ae10ae2c1",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9d21199842247ab05c675fb9b6c6ca393a5c0024",
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"lessThan": "a3125bc01884431d30d731461634c8295b6f0529",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/bpf/verifier.c"
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],
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"versions": [
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{
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"version": "6.18.17",
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"lessThan": "6.18.21",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.19.7",
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"lessThan": "6.19.11",
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"status": "affected",
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"versionType": "semver"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18.17",
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"versionEndExcluding": "6.18.21"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19.7",
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"versionEndExcluding": "6.19.11"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a17443af874229408ce6b78e2c8a2b5adeb4b7d8"
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},
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{
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"url": "https://git.kernel.org/stable/c/0d15c3611a2cc5d08993545d4032055ae10ae2c1"
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},
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{
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"url": "https://git.kernel.org/stable/c/a3125bc01884431d30d731461634c8295b6f0529"
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}
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],
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"title": "bpf: Reset register ID for BPF_END value tracking",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |