264 lines
14 KiB
JSON
264 lines
14 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-2026-98241",
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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": "2026-09-25T10:25:14.329Z",
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"datePublished": "2026-10-06T08:45:11.954Z",
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"dateUpdated": "2026-10-19T09:16:12.796Z"
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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": "2026-10-19T09:16:12.796Z"
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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\nipv6: xfrm: use full sockets in local error paths\n\nxfrm6_local_rxpmtu() and xfrm6_local_error() dereference skb->sk as if it\nalways pointed at a full IPv6 socket.\n\nThat is not guaranteed. TCP SYN-ACK skbs can be owned by a\nTCP_NEW_SYN_RECV request_sock while the output path itself is driven by the\nfull listener. If rerouting selects an IPv6 XFRM tunnel route with a lower\nMTU, the local PMTU/error handling path can reach these callbacks with that\nmini-socket still attached to the skb.\n\nThe callbacks then miscast the request socket as a full inet/IPv6 socket and\ncan read beyond the request_sock allocation when they access inet_sock or\nipv6_pinfo state.\n\nResolve the owner with skb_to_full_sk() in both callbacks and bail out when\nno full socket is attached. This matches the surrounding XFRM IPv6 PMTU/error\nlogic, which already reasons about full sockets with skb_to_full_sk()."
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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 fixed xfrm6_local_error() is reached via __xfrm6_output() -> xfrm_local_error() only if a rerouted SYN-ACK exceeds an xfrm tunnel MTU below ~100 bytes; that needs local xfrm/route/netfilter setup. A remote SYN carries no malformed data and can't create this state (IPv4 PMTU floor is 552, xfrm6_tunnel_check_size clamps to 1280).\nAC:L - The attacker builds every precondition: an IPv6-in-IPv4 tunnel-mode xfrm SA/policy, a tiny outer MTU, a LOCAL_OUT reroute, and a TCP listener they connect to. Each SYN deterministically sends a SYN-ACK owned by a TCP_NEW_SYN_RECV request_sock down the !ignore_df && toobig branch.\nPR:L - The needed XFRM_MSG_NEWSA/NEWPOLICY, nftables rules and link MTU changes only need CAP_NET_ADMIN in the netns, which an unprivileged user gets via unshare -Urn; the listener and connect() are ordinary syscalls.\nUI:N - The attacker sets up the namespace and drives the handshake that emits the SYN-ACK themselves; no other user has to do anything.\nS:U - The out-of-bounds access corrupts kernel heap memory in the same kernel that enforces the attacker's namespace; no hypervisor or IOMMU boundary is crossed.\nC:H - xfrm6_local_error() passes the request_sock to ipv6_local_error() as a full IPv6 socket; inet6_test_bit(RECVERR6) reads inet_flags past the end of the tcp6_request_sock allocation, into the next slab object, and the rest of the path keeps reading socket fields out of bounds.\nI:H - If the out-of-bounds RECVERR6 bit is set, sock_queue_err_skb() does atomic_add on an OOB sk_rmem_alloc, links an skb into an OOB sk_error_queue list and calls the OOB sk_error_report pointer: heap writes plus control-flow hijack if the attacker grooms the adjacent object.\nA:H - Treating neighbouring slab memory as sk_error_queue and sk_error_report gives list corruption or a wild indirect call, crashing the kernel; the attacker can repeat it with each SYN."
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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/ipv6/xfrm6_output.c"
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],
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"versions": [
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{
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"version": "dd767856a36e00b631d65ebc4bb81b19915532d6",
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"lessThan": "b1a88633c36d2cbc3831382f3846754d344276fd",
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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": "dd767856a36e00b631d65ebc4bb81b19915532d6",
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"lessThan": "904a0e827d0d7189271a3a2eb648293809f25efc",
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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": "dd767856a36e00b631d65ebc4bb81b19915532d6",
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"lessThan": "675919e08ce266b8cac11fd9af29170e762a480f",
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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": "dd767856a36e00b631d65ebc4bb81b19915532d6",
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"lessThan": "60459c670329d586a58db5d8f811fa5accfe4862",
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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": "dd767856a36e00b631d65ebc4bb81b19915532d6",
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"lessThan": "ca3d68c3213475b53db6647e159dc73bd1af5ab1",
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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": "dd767856a36e00b631d65ebc4bb81b19915532d6",
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"lessThan": "4c030a0400ebfd2318361c923a88103b2c67c49f",
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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": "dd767856a36e00b631d65ebc4bb81b19915532d6",
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"lessThan": "c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8",
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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": "dd767856a36e00b631d65ebc4bb81b19915532d6",
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"lessThan": "6973a21ee73c5567f883813c8ef414774b45892f",
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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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"net/ipv6/xfrm6_output.c"
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],
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"versions": [
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{
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"version": "3.2",
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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": "3.2",
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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": "5.10.271",
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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": "5.15.222",
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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": "6.1.189",
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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": "6.6.158",
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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": "6.12.112",
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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": "6.18.54",
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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": "7.2.8",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "3.2",
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"versionEndExcluding": "5.10.271"
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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/b1a88633c36d2cbc3831382f3846754d344276fd"
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},
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{
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"url": "https://git.kernel.org/stable/c/904a0e827d0d7189271a3a2eb648293809f25efc"
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},
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{
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"url": "https://git.kernel.org/stable/c/675919e08ce266b8cac11fd9af29170e762a480f"
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},
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{
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"url": "https://git.kernel.org/stable/c/60459c670329d586a58db5d8f811fa5accfe4862"
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},
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{
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"url": "https://git.kernel.org/stable/c/ca3d68c3213475b53db6647e159dc73bd1af5ab1"
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},
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{
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"url": "https://git.kernel.org/stable/c/4c030a0400ebfd2318361c923a88103b2c67c49f"
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},
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{
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"url": "https://git.kernel.org/stable/c/c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8"
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},
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{
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"url": "https://git.kernel.org/stable/c/6973a21ee73c5567f883813c8ef414774b45892f"
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}
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],
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"title": "ipv6: xfrm: use full sockets in local error paths",
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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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} |