312 lines
17 KiB
JSON
312 lines
17 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-2026-64543",
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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": "2026-07-19T15:36:31.795Z",
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"datePublished": "2026-07-27T20:10:35.565Z",
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"dateUpdated": "2026-10-19T20:48:39.735Z"
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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": "2026-08-19T16:28:28.342Z"
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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\ntipc: fix use-after-free of the discoverer in tipc_disc_rcv()\n\nbearer_disable() frees b->disc with tipc_disc_delete()'s plain kfree(),\nbut tipc_disc_rcv() still dereferences b->disc in RX softirq under\nrcu_read_lock() (tipc_udp_recv -> tipc_rcv -> tipc_disc_rcv).\n\nL2 bearers are safe thanks to the synchronize_net() in\ntipc_disable_l2_media(), but the UDP bearer defers that call to the\ncleanup_bearer() workqueue, so the discoverer is freed with no grace\nperiod:\n\n BUG: KASAN: slab-use-after-free in tipc_disc_rcv (net/tipc/discover.c:149)\n Read of size 8 at addr ffff88802348b728 by task poc_tipc/184\n <IRQ>\n tipc_disc_rcv (net/tipc/discover.c:149)\n tipc_rcv (net/tipc/node.c:2126)\n tipc_udp_recv (net/tipc/udp_media.c:391)\n udp_rcv (net/ipv4/udp.c:2643)\n ip_local_deliver_finish (net/ipv4/ip_input.c:241)\n </IRQ>\n Freed by task 181:\n kfree (mm/slub.c:6565)\n bearer_disable (net/tipc/bearer.c:418)\n tipc_nl_bearer_disable (net/tipc/bearer.c:1001)\n\nThe bearer is freed with kfree_rcu(); free the discoverer the same way.\nAdd an rcu_head to struct tipc_discoverer and free it and its skb from an\nRCU callback.\n\nBecause the RCU callback (tipc_disc_free_rcu) lives in module text, a\ncall_rcu() that is still pending when the tipc module is unloaded would\ninvoke a freed function. Add an rcu_barrier() to tipc_exit() after the\nbearer subsystem has been torn down, so all pending discoverer callbacks\nhave run before the module text goes away.\n\nReachable from an unprivileged user namespace: the TIPCv2 genl family is\nnetnsok and its bearer commands have no GENL_ADMIN_PERM. Needs CONFIG_TIPC\nand CONFIG_TIPC_MEDIA_UDP."
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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 free side is only reachable through the local TIPCv2 generic-netlink `BEARER_DISABLE` command (or netns teardown); a remote peer can supply the discovery packet that performs the use-after-free access but cannot itself cause `bearer_disable()` to run, so the complete attack requires local access.\nAC:L - The attacker controls both sides of the race — one thread floods TIPC discovery packets at the bearer's UDP port while another disables the bearer — and `bearer_disable()` clears `b->up` and then `kfree()`s the discoverer with no synchronization whatsoever, leaving a wide window that a multi-CPU packet flood hits reliably (a working PoC exists).\nPR:L - `tipc_genl_family` is `.netnsok = true` and the bearer enable/disable ops carry no `GENL_ADMIN_PERM` or other capability check, so an unprivileged user can do everything inside `unshare -Urn` after autoloading tipc via `socket(AF_TIPC, ...)`.\nUI:N - The attacking process performs both the bearer disable and the packet injection itself; no victim action or cooperating user is involved.\nS:U - The corruption stays within the kernel's own security authority — no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - `d->net` is read from the freed slab object and dereferenced as a `struct net *`; after reclaiming the kmalloc-192 allocation with sprayed data the attacker gains a controlled-pointer dereference chain usable for arbitrary kernel memory disclosure.\nI:H - `msg_set_prevnode(buf_msg(d->skb), sugg_addr)` writes a wire-controlled 32-bit value through the dangling `d->skb` pointer, and `tipc_disc_add_dest()` takes a spinlock and increments a counter in freed memory — together a controlled-address/controlled-value write suitable for control-flow hijacking.\nA:H - The use-after-free reliably produces a KASAN slab-use-after-free in softirq context and, on production kernels, a corrupted-pointer dereference or spinlock manipulation on reclaimed memory leading to kernel 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/tipc/core.c",
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"net/tipc/discover.c"
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],
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"versions": [
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{
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"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259",
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"lessThan": "380413cdfd29fb9fa486c82889132b680c4983c5",
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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": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259",
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"lessThan": "f05b3f4c78370469286879c765f5a1dd39dbcd32",
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"status": "affected",
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},
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{
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"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259",
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"lessThan": "4da2ac7749411971e1b222b992da5a172ce45f98",
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"status": "affected",
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{
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"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259",
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"lessThan": "5e215bf1c47fdddf8203a0fe80a0ed594065f101",
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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": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259",
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"lessThan": "ec7d54d8cc1723921d671e3272b427c96366506f",
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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": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259",
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"lessThan": "a0c5fdeb5fa257f8c6d469af266bc087cb5de6a2",
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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": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259",
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"lessThan": "b65289e1c3f352a9f92c6e19713ddd647e033253",
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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": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259",
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"lessThan": "1579342d71133da7f00daa02c75cebec7372097b",
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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/tipc/core.c",
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"net/tipc/discover.c"
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],
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"versions": [
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{
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"version": "4.17",
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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": "4.17",
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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": "5.10.265",
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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": "5.15.216",
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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": "6.1.183",
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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": "6.6.145",
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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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{
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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": "4.17",
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"versionEndExcluding": "5.10.265"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/380413cdfd29fb9fa486c82889132b680c4983c5"
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},
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{
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"url": "https://git.kernel.org/stable/c/f05b3f4c78370469286879c765f5a1dd39dbcd32"
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},
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{
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"url": "https://git.kernel.org/stable/c/4da2ac7749411971e1b222b992da5a172ce45f98"
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},
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{
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"url": "https://git.kernel.org/stable/c/5e215bf1c47fdddf8203a0fe80a0ed594065f101"
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},
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{
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"url": "https://git.kernel.org/stable/c/ec7d54d8cc1723921d671e3272b427c96366506f"
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},
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{
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"url": "https://git.kernel.org/stable/c/a0c5fdeb5fa257f8c6d469af266bc087cb5de6a2"
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},
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{
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"url": "https://git.kernel.org/stable/c/b65289e1c3f352a9f92c6e19713ddd647e033253"
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},
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{
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"url": "https://git.kernel.org/stable/c/1579342d71133da7f00daa02c75cebec7372097b"
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}
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],
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"title": "tipc: fix use-after-free of the discoverer in tipc_disc_rcv()",
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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-2026-64543",
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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": "2026-10-16T15:42:12.338756Z"
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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": "2026-10-19T20:48:39.735Z"
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}
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}
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]
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}
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} |