256 lines
13 KiB
JSON
256 lines
13 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-2026-80637",
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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": "2026-08-26T14:34:25.777Z",
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"datePublished": "2026-08-28T06:48:50.836Z",
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"dateUpdated": "2026-10-30T12:30:49.999Z"
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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": "2026-10-30T12:30:49.999Z"
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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\nnetfilter: synproxy: fix unaligned memory access in timestamp adjustment\n\nUse get_unaligned_be32() and put_unaligned_be32() to safely read and\nwrite the timestamp fields. This prevents performance degradation due to\nunaligned memory access or even a crash on strict alignment\narchitectures.\n\nThis follows the implementation of timestamp parsing in the networking\nstack at tcp_parse_options() and synproxy_parse_options()."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - synproxy_tstamp_adjust() runs in ipv4/ipv6_synproxy_hook on received TCP segments after SYNPROXY handshake; internet-facing gateways with SYNPROXY enabled process attacker-crafted inbound packets, matching CNA precedent for remote synproxy packet bugs.\nAC:L - Once SYNPROXY with timestamps is active and tsoff is set, the attacker fully controls TCP option layout and can reliably place TCPOPT_TIMESTAMP so op[2]/op[6] are 2-mod-4 unaligned (e.g. MSS+SACK_PERM+two NOPs+TIMESTAMP), deterministically hitting the misaligned __be32 access.\nPR:N - Exploitation requires only sending TCP traffic to a host where an administrator already enabled SYNPROXY/nftables synproxy with timestamps; the remote attacker needs no local account, capability, or authentication on the target.\nUI:N - The netfilter hook processes matching TCP segments automatically during normal connection handling; no victim user action beyond routine network connectivity to the protected service is required.\nS:U - An alignment fault in synproxy timestamp adjustment panics or oopses the host kernel but does not cross VM, container, IOMMU, or other security boundaries; impact remains within the same kernel authority.\nC:N - The flaw is misaligned load/store of the packet's own TCP timestamp fields inside the skb buffer, not an out-of-bounds or use-after-free read of kernel memory; on strict-alignment architectures it faults immediately without disclosing attacker-inaccessible data.\nI:N - No kernel metadata or adjacent structures are corrupted; the write only adjusts the intended timestamp value in the TCP option bytes, and strict-alignment targets fault before any unintended modification can occur.\nA:H - The commit and fault mechanism confirm that direct misaligned __be32 dereference on strict-alignment architectures (e.g. SPARC, some ARM) causes a kernel alignment fault/oops/panic, fully denying availability on SYNPROXY-protected gateways and embedded routers."
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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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"net/netfilter/nf_synproxy_core.c"
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],
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"version": "48b1de4c110a7afa4b85862f6c75af817db26fad",
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"vendor": "Linux",
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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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"net/netfilter/nf_synproxy_core.c"
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],
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"versions": [
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{
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"version": "3.12",
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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": "3.12",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.160",
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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": "6.12.97",
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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": "6.18.40",
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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": "7.1.5",
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/b30a2d56ee47282f6a46cb2f50e315b2414851fe"
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"url": "https://git.kernel.org/stable/c/ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7"
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{
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"url": "https://git.kernel.org/stable/c/992c20bc8a4aba220c8b95b467d049289778dad6"
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}
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],
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"title": "netfilter: synproxy: fix unaligned memory access in timestamp adjustment",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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-2026-80637",
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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": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:19:14.142885Z"
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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": "2026-10-16T19:26:31.587Z"
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}
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}
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]
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}
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} |