264 lines
15 KiB
JSON
264 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-2026-98485",
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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": "2026-09-25T10:25:14.352Z",
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"datePublished": "2026-10-18T15:16:00.435Z",
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"dateUpdated": "2026-10-24T14:09:02.897Z"
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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": "2026-10-24T14:09:02.897Z"
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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: ip6t_rt: fix zero-address non-strict match out-of-bounds read\n\nrt_mt6_check() permits rules to be configured with rtinfo->addrnr == 0\neven when address matching (IP6T_RT_FST_MASK) is requested.\n\nIn the IP6T_RT_FST_NSTRICT path, rt_mt6() evaluates packet routing\naddresses against rtinfo->addrs[i] and terminates backwards at the bottom\nof the loop:\n\n if (ipv6_addr_equal(ap, &rtinfo->addrs[i])) {\n i++;\n }\n if (i == rtinfo->addrnr)\n break;\n\nWhen addrnr is 0, if the first packet address matches rtinfo->addrs[0],\ni is incremented to 1. Because i is now strictly greater than addrnr (0),\nthe loop termination condition (i == rtinfo->addrnr) is bypassed and will\nnever be satisfied.\n\nIf a crafted IPv6 packet contains matching routing addresses, i will\nadvance past IP6T_RT_HOPS (16). The subsequent call to ipv6_addr_equal()\nreads beyond struct ip6t_rt, triggering UBSAN/KASAN out-of-bounds warnings\nor kernel panics.\n\nFix this by:\n1. Rejecting rules in rt_mt6_check() where IP6T_RT_FST_MASK is set but\n rtinfo->addrnr is zero.\n2. In rt_mt6(), moving the termination condition (i < rtinfo->addrnr)\n into the for-loop header condition and removing the backwards break\n at the end of the loop body."
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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:N/A:H",
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"baseScore": 7.1,
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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 bad state enters through local setsockopt(IP6T_SO_SET_REPLACE) or NFT_MSG_NEWRULE rule installation; ip6_rcv then reaches rt_mt6 through NF_INET_PRE_ROUTING and ip6t_do_table. A remote packet alone cannot create the required zero-address rule.\nAC:L - The attacker controls the rule's addrs[] despite addrnr being zero and can send a 17-address routing header whose first 16 addresses match, making rt_mt6 deterministically read addrs[16]. No race or external timing condition is required.\nPR:L - do_ip6t_set_ctl requires ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN), while nfnetlink uses netlink_net_capable; an unprivileged user can satisfy either check in a user-created user and network namespace.\nUI:N - The attacker installs the malformed rule and injects the triggering IPv6 packet through their own syscalls. No action by another user is needed.\nS:U - The invalid read occurs during netfilter rule evaluation inside the same host kernel security authority. It does not cross a VM, IOMMU, or comparable scope boundary.\nC:H - ipv6_addr_equal() reads 16 bytes from each selected &rtinfo->addrs[i], and rt_mt6 can advance beyond the fixed 16-entry array across up to 127 routing-header address iterations. The overread is therefore not strictly bounded to a few bytes.\nI:N - rt_mt6 only fetches the out-of-bounds address for comparison and updates its local index; it performs no out-of-bounds write or other memory modification.\nA:H - At i == 16, the fixed-array subscript and 16-byte ipv6_addr_equal() load trigger UBSAN/KASAN out-of-bounds handling and can panic the kernel, as documented by the fix. The attacker can repeat the rule-and-packet sequence without a race."
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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/netfilter/ip6t_rt.c"
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],
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"versions": [
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "959d1829d1ce8b91b435b24a923b51bcc8897090",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "fe336bab13834394320997de8b16ca4a913b4f13",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "5a54f8b7f7fe207a5c14713015a5820588faf1ad",
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"status": "affected",
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"lessThan": "b89249819a7d6698bed152feafd3bc6c08489d15",
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"status": "affected",
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},
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "dd55c0ea87bf70e4e4b3b683acd29ef981335b26",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "191239b0939692e92459d8d32cad14247fa93f89",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "d9cf4ac6f326330e1fe4d95671d36a6ff3593f64",
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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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "82313c169eddc02b1bf5ba6b427803e272d3ec42",
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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/netfilter/ip6t_rt.c"
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],
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"versions": [
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{
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"version": "2.6.12",
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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": "2.6.12",
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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": "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": "6.18.55",
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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": "7.2.9",
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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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"references": [
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{
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},
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{
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"url": "https://git.kernel.org/stable/c/fe336bab13834394320997de8b16ca4a913b4f13"
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},
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{
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"url": "https://git.kernel.org/stable/c/5a54f8b7f7fe207a5c14713015a5820588faf1ad"
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},
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{
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"url": "https://git.kernel.org/stable/c/b89249819a7d6698bed152feafd3bc6c08489d15"
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},
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{
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"url": "https://git.kernel.org/stable/c/dd55c0ea87bf70e4e4b3b683acd29ef981335b26"
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},
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{
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"url": "https://git.kernel.org/stable/c/191239b0939692e92459d8d32cad14247fa93f89"
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},
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{
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"url": "https://git.kernel.org/stable/c/d9cf4ac6f326330e1fe4d95671d36a6ff3593f64"
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},
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{
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"url": "https://git.kernel.org/stable/c/82313c169eddc02b1bf5ba6b427803e272d3ec42"
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}
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],
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"title": "netfilter: ip6t_rt: fix zero-address non-strict match out-of-bounds read",
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