229 lines
12 KiB
JSON
229 lines
12 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-2026-92489",
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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": "2026-09-16T12:21:13.871Z",
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"datePublished": "2026-09-17T16:10:04.126Z",
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"dateUpdated": "2026-10-19T09:03:55.784Z"
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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": "2026-10-19T09:03:55.784Z"
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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\nxfrm: Fix skb double-free in xfrm_dev_direct_output()\n\nA return value other than 1 from local_out() means that the skb has been\nconsumed or its ownership was transferred. xfrm_dev_direct_output()\nnevertheless frees the skb on this path, causing a double-free when\nnetfilter drops the packet and invalidating any other owner.\n\nReturn the local_out() result directly, matching the ownership handling\nin xfrm_output_resume()."
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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:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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 - A received IPv4/IPv6 packet that ip_forward()/ip6_forward() passes through xfrm4_route_forward()/xfrm6_route_forward() reaches xfrm4_output()/xfrm6_output() then xfrm_output(); for an XFRM_DEV_OFFLOAD_PACKET tunnel SA with skb->sk NULL, that forwarded inner IP packet is what xfrm_dev_direct_output() processes.\nAC:L - xfrm_dev_direct_output() calls nf_reset_ct() then dst->ops->local_out (__ip_local_out/__ip6_local_out), so NF_INET_LOCAL_OUT consumes the skb on DROP/QUEUE/STOLEN. The attacker owns the forwarded packet and can force that verdict (iptables/nft DROP, or nf_conntrack_in() NF_DROP when resolve_normal_ct() fails after flooding new 5-tuples); no race is required.\nPR:N - ip_forward() and ip6_forward() take the skb with no socket or credentials; XFRM matching is only the received packet's IP selectors, not an authenticated session. CAP_NET_ADMIN is needed on the victim to install the packet-offload SA, not for the attacker who sends the inner packet.\nUI:N - The attacker triggers the bug only by sending IP packets that an already-configured packet-offload tunnel gateway forwards into xfrm_dev_direct_output(); no victim mount, open, or confirmation is required at exploit time.\nS:U - The sk_buff double-free in xfrm_dev_direct_output() corrupts kernel heap in the same kernel that performs IPsec output and is not a KVM/Xen guest-to-host escape or an IOMMU/DMA boundary bypass.\nC:H - When local_out() returns != 1, nf_hook_slow() has already kfree_skb_reason()'d the skb on NF_DROP (or another owner holds it); the extra kfree_skb() in xfrm_dev_direct_output() is a sk_buff slab double-free that can be reclaimed with crafted packets to read kernel memory.\nI:H - The same sk_buff double-free after __ip_local_out()/__ip6_local_out() transfers ownership lets the attacker reallocate the freed object and obtain a kernel write and control-flow hijack primitive, not a crash-only integrity effect.\nA:H - The extra kfree_skb() in xfrm_dev_direct_output() when local_out() has already consumed the skb corrupts the sk_buff cache and causes a kernel oops or panic."
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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/xfrm/xfrm_output.c"
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],
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"versions": [
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{
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"version": "bfb9b9404a53a72524ce695551755117e9d3deb0",
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"lessThan": "621871b696b108026bf4b44ed4085ffa2102f417",
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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": "a0395e96831adee8ffa016bf958e4dce9ece656e",
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"lessThan": "bc9297796bfdcc8d9609236e54519a4f38737aac",
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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": "5eddd76ec2fd1988f0a3450fde9730b10dd22992",
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"lessThan": "02deb637e965950148752a304dd1471212dd6470",
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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": "5eddd76ec2fd1988f0a3450fde9730b10dd22992",
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"lessThan": "56a347950e661c1a7f8f31c43a2ea53c2323b6f4",
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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": "5eddd76ec2fd1988f0a3450fde9730b10dd22992",
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"lessThan": "2aed51fc58d9ce450e2c116efb956160fd06fa02",
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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": "d1d673a5bede3767252cff19c0ab1e5387c6f43f",
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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": "6.6.85",
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"lessThan": "6.6.157",
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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": "6.12.21",
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"lessThan": "6.12.110",
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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": "6.13.9",
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"lessThan": "6.14",
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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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"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/xfrm/xfrm_output.c"
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],
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"versions": [
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{
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"version": "6.14",
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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": "6.14",
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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": "6.6.157",
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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": "6.12.110",
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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": "6.18.52",
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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": "7.2.6",
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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": "6.6.85",
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"versionEndExcluding": "6.6.157"
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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": "6.12.21",
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"versionEndExcluding": "6.12.110"
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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": "6.14",
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"versionEndExcluding": "6.18.52"
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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": "6.14",
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"versionEndExcluding": "7.2.6"
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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": "6.14",
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"versionEndExcluding": "7.3"
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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": "6.13.9"
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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/621871b696b108026bf4b44ed4085ffa2102f417"
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},
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{
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"url": "https://git.kernel.org/stable/c/bc9297796bfdcc8d9609236e54519a4f38737aac"
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},
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{
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"url": "https://git.kernel.org/stable/c/02deb637e965950148752a304dd1471212dd6470"
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},
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{
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"url": "https://git.kernel.org/stable/c/56a347950e661c1a7f8f31c43a2ea53c2323b6f4"
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},
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{
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"url": "https://git.kernel.org/stable/c/2aed51fc58d9ce450e2c116efb956160fd06fa02"
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}
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],
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"title": "xfrm: Fix skb double-free in xfrm_dev_direct_output()",
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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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} |