232 lines
13 KiB
JSON
232 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-2026-64575",
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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": "2026-07-19T15:36:31.797Z",
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"datePublished": "2026-08-05T08:09:31.923Z",
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"dateUpdated": "2026-10-19T20:48:42.635Z"
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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": "2026-08-19T16:28:54.764Z"
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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: tcp: fix double sock release on batch realloc\n\nbpf_iter_tcp_batch() releases the current batch via\nbpf_iter_tcp_put_batch(), which drops the socket refs and rewrites\neach slot with the socket cookie, then grows the batch. cur_sk/end_sk\nare kept for bpf_iter_tcp_resume(), but on realloc failure the function\nreturns ERR_PTR() before resume runs, leaving cur_sk < end_sk over\nslots that now hold cookies rather than sock pointers.\nbpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and\ndereferences a cookie as a struct sock.\n\nEmpty the batch on the failure path so stop() does not release it\nagain. The sockets were already freed by the first\nbpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans\nthe bucket from the start instead of skipping it. The sibling\nGFP_NOWAIT failure path still holds real socket references and is left\nfor stop() to release.\n\n BUG: KASAN: null-ptr-deref in __sock_gen_cookie\n Read of size 8 at addr 0000000000000059 by task exploit\n ...\n __sock_gen_cookie (net/core/sock_diag.c:28)\n bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918)\n bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270)\n bpf_seq_read (kernel/bpf/bpf_iter.c:205)\n vfs_read (fs/read_write.c:572)\n ksys_read (fs/read_write.c:716)\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n Kernel panic - not syncing: Fatal exception"
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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 - Reached only through local bpf() syscalls that load a BPF_TRACE_ITER TCP program, create an iterator fd, and read it; bpf_seq_read drives bpf_iter_tcp_batch/stop. Per guidance BPF subsystem bugs are Local, not network-reachable.\nAC:L - The attacker controls both prerequisites: creating more than INIT_BATCH_SZ TCP sockets in one hash bucket to force bpf_iter_tcp_put_batch-then-realloc, and inducing GFP_USER -ENOMEM (memory pressure/cgroup limits) so the failure path runs without races outside their control.\nPR:L - Loading BPF_PROG_TYPE_TRACING/BPF_TRACE_ITER requires CAP_BPF and CAP_PERFMON, which BPF tokens can delegate into a non-init user namespace; consistent with other BPF iterator CVEs this is Low rather than full init-namespace root.\nUI:N - The attacker loads their own TCP iterator program and triggers the bug by reading their iterator fd; no victim action such as mounting, opening a file, or interacting with the attacker is required.\nS:U - Impact is kernel memory corruption and panic within the same host kernel security authority; this is a standard local kernel bug, not a VM/hypervisor escape or IOMMU boundary bypass.\nC:H - stop() re-enters bpf_iter_tcp_put_batch and treats stored socket cookies as struct sock pointers, so sock_gen_cookie performs an out-of-bounds/wild kernel read; type-confused pointer dereference supports high confidentiality impact under the higher-severity rule.\nI:H - The same type confusion reaches sock_gen_put, which decrements sk_refcnt and may free through the forged pointer, yielding kernel memory corruption and a plausible control-flow/integrity primitive beyond a clean crash.\nA:H - The reported path is a KASAN null-ptr-deref in __sock_gen_cookie during bpf_iter_tcp_seq_stop that ends in kernel panic; the attacker can repeat the iterator read to deny host availability."
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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/ipv4/tcp_ipv4.c"
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],
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"versions": [
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{
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"version": "9794ac757a650dd594391192183c9caf939f8223",
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"lessThan": "c842882e4c5d2818b858d6baf3fd10958c93f729",
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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": "1d7a82c1df5fc397eaca9c6b8c8f61aae9866ad4",
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"lessThan": "7a6a6d2a127866935f87b55b557bc89693065462",
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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": "36f955807ee4ede07e9410772f792e4cb4ec807b",
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"lessThan": "f0c1810320b0dac228103fad7311e89532134d83",
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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": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
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"lessThan": "9f27c4f0ae35b5390ce4f7a54d3501144e41a54d",
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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": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
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"lessThan": "8a726e9585ffe7bfbfad2b5279277a00973970f3",
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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": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
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"lessThan": "980a813452754f8001704744e92f7aa697c53dd3",
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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/ipv4/tcp_ipv4.c"
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],
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"versions": [
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{
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"version": "6.17",
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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": "6.17",
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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": "6.18.42",
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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": "7.1.6",
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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": "6.17",
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"versionEndExcluding": "6.18.42"
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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": "6.17",
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"versionEndExcluding": "7.1.6"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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"versionEndExcluding": "7.2"
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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/c842882e4c5d2818b858d6baf3fd10958c93f729"
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},
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{
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"url": "https://git.kernel.org/stable/c/7a6a6d2a127866935f87b55b557bc89693065462"
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},
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{
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"url": "https://git.kernel.org/stable/c/f0c1810320b0dac228103fad7311e89532134d83"
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},
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{
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"url": "https://git.kernel.org/stable/c/9f27c4f0ae35b5390ce4f7a54d3501144e41a54d"
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},
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{
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"url": "https://git.kernel.org/stable/c/8a726e9585ffe7bfbfad2b5279277a00973970f3"
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},
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{
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"url": "https://git.kernel.org/stable/c/980a813452754f8001704744e92f7aa697c53dd3"
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}
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],
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"title": "bpf: tcp: fix double sock release on batch realloc",
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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-2026-64575",
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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": "2026-10-16T15:43:09.032103Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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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": "2026-10-19T20:48:42.635Z"
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}
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}
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]
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}
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} |