298 lines
15 KiB
JSON
298 lines
15 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-2026-74720",
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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": "2026-08-15T05:44:03.929Z",
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"datePublished": "2026-08-22T15:33:13.342Z",
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"dateUpdated": "2026-10-16T19:16:11.811Z"
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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": "2026-08-25T05:42:01.009Z"
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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: Preserve pointer state for commuted arithmetic\n\nWhen scalar += pointer is handled in adjust_ptr_min_max_vals(), the\ndestination register inherits the pointer state from the source pointer.\nCopying only selected fields is fragile because pointer provenance is\ntracked by several bpf_reg_state fields.\n\nUse the caller's temporary offset register to preserve the scalar operand\nwhile replacing the destination with the full pointer state. This preserves\nthe frame number for PTR_TO_STACK registers and keeps parent identity\nfields consistent."
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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 flaw is in bpf_check()/adjust_ptr_min_max_vals() during bpf(BPF_PROG_LOAD) via the local bpf(2) syscall; per kernel CNA guidance BPF verifier bugs are Local, not reachable from remote network packet handling.\nAC:L - An attacker fully controls BPF bytecode using commuted 64-bit scalar+=pointer ALU and bpf2bpf call chains, deterministically poisoning register state during verification without races or external preconditions.\nPR:L - Exploitation requires loading bpf2bpf programs (CAP_BPF-gated), which is routinely available to unprivileged users via user namespaces/BPF token delegation or unprivileged socket-filter loading when kernel.unprivileged_bpf_disabled=0, not init-namespace root.\nUI:N - The attacker loads and executes their own crafted BPF program through bpf(2); no separate victim action such as mounting filesystems or opening files is required beyond the attacker's own local access.\nS:U - Impact is a BPF verifier bypass enabling in-kernel out-of-bounds memory access and privilege escalation within the host kernel's security authority; it does not cross VM, IOMMU, or sandbox boundaries.\nC:H - Copying only type/id on scalar+=pointer leaves stale frameno, var_off, and map/parent metadata, so bpf_func() stack checks validate the wrong frame and approve out-of-bounds reads of adjacent kernel memory.\nI:H - The same incorrect pointer provenance permits verifier-approved out-of-bounds BPF stack/map writes at runtime, a controllable kernel memory corruption primitive leverageable for arbitrary modification and privilege escalation.\nA:H - Out-of-bounds BPF memory accesses from the bypassed verifier state can corrupt critical kernel data or dereference invalid addresses, reliably causing kernel oops/panic and repeatable denial of service."
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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": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
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"lessThan": "86b203aadc2930e0a4f9c6277b5b80ff3664c472",
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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": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
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"lessThan": "8109c25e0c41f5f19a1c2380bb49c991a877494e",
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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": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
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"lessThan": "d1959028190a7649b926f5867a58de5fe221b23c",
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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": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
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"lessThan": "8cb23101a3fcc7432b451ea3d0f14a90711f4acf",
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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": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
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"lessThan": "29c239f8dbec5ab33a61796724d189bddee6cd4b",
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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": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
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"lessThan": "db6382ed3361bdd8129572a3423956cba1dae829",
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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": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
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"lessThan": "eaffa1495e4fe6330aeff9f323ea3d48b01f118a",
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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": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941",
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"lessThan": "a4c6f804b44c5c790269b25e0e61cf4e9f117c86",
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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": "affected",
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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": "4.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.265",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.216",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.183",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.152",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.104",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.45",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.9",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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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": "4.16",
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"versionEndExcluding": "5.10.265"
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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": "4.16",
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"versionEndExcluding": "5.15.216"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.16",
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"versionEndExcluding": "6.1.183"
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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": "4.16",
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"versionEndExcluding": "6.6.152"
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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": "4.16",
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"versionEndExcluding": "6.12.104"
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"versionEndExcluding": "6.18.45"
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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": "4.16",
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"versionEndExcluding": "7.1.9"
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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": "4.16",
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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/86b203aadc2930e0a4f9c6277b5b80ff3664c472"
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},
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{
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"url": "https://git.kernel.org/stable/c/8109c25e0c41f5f19a1c2380bb49c991a877494e"
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},
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{
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"url": "https://git.kernel.org/stable/c/d1959028190a7649b926f5867a58de5fe221b23c"
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},
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{
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"url": "https://git.kernel.org/stable/c/8cb23101a3fcc7432b451ea3d0f14a90711f4acf"
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},
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{
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"url": "https://git.kernel.org/stable/c/29c239f8dbec5ab33a61796724d189bddee6cd4b"
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},
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{
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"url": "https://git.kernel.org/stable/c/db6382ed3361bdd8129572a3423956cba1dae829"
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},
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{
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"url": "https://git.kernel.org/stable/c/eaffa1495e4fe6330aeff9f323ea3d48b01f118a"
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},
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{
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"url": "https://git.kernel.org/stable/c/a4c6f804b44c5c790269b25e0e61cf4e9f117c86"
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}
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],
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"title": "bpf: Preserve pointer state for commuted arithmetic",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74720",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:15:35.375502Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:16:11.811Z"
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}
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}
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]
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}
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} |