247 lines
15 KiB
JSON
247 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-2026-64109",
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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": "2026-07-19T07:54:57.034Z",
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"datePublished": "2026-07-19T15:40:11.510Z",
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"dateUpdated": "2026-10-19T20:28:12.212Z"
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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": "2026-08-05T12:39:18.983Z"
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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\naf_unix: Fix UAF read of tail->len in unix_stream_data_wait()\n\nunix_stream_data_wait() does skb_peek_tail(&sk->sk_receive_queue) without\nholding any lock that prevents SKBs on that queue from being dequeued and\nfreed.\nThis has been the case since commit 79f632c71bea (\"unix/stream: fix\npeeking with an offset larger than data in queue\").\nThe first consequence of this is that the pointer comparison\n`tail != last` can be false even if `last` semantically refers to an\nalready-freed SKB while `tail` is a new SKB allocated at the same address;\nwhich can cause unix_stream_data_wait() to wrongly keep blocking after new\ndata has arrived, but only in a weird scenario where a peeking recv() and\na normal recv() on the same socket are racing, which is probably not a\nreal problem.\n\nBut since commit 2b514574f7e8 (\"net: af_unix: implement splice for stream\naf_unix sockets\"), `tail` is actually dereferenced, which can cause UAF in\nthe following race scenario (where test_setup() runs single-threaded,\nand afterwards, test_thread1() and test_thread2() run concurrently in\ntwo threads:\n```\nstatic int socks[2];\nvoid test_setup(void) {\n socketpair(AF_UNIX, SOCK_STREAM, 0, socks);\n send(socks[1], \"A\", 1, 0);\n int peekoff = 1;\n setsockopt(socks[0], SOL_SOCKET, SO_PEEK_OFF, &peekoff, sizeof(peekoff));\n}\nvoid test_thread1(void) {\n char dummy;\n recv(socks[0], &dummy, 1, MSG_PEEK);\n}\nvoid test_thread2(void) {\n char dummy;\n recv(socks[0], &dummy, 1, 0);\n shutdown(socks[1], SHUT_WR);\n}\n```\n\nwhen racing like this:\n```\nthread1 thread2\nunix_stream_read_generic\n mutex_lock(&u->iolock)\n skb_peek(&sk->sk_receive_queue)\n skb_peek_next(skb, &sk->sk_receive_queue)\n mutex_unlock(&u->iolock)\n unix_stream_read_generic\n unix_state_lock(sk)\n skb_peek(&sk->sk_receive_queue)\n unix_state_unlock(sk)\n unix_stream_data_wait\n unix_state_lock(sk)\n tail = skb_peek_tail(&sk->sk_receive_queue)\n spin_lock(&sk->sk_receive_queue.lock)\n __skb_unlink(skb, &sk->sk_receive_queue)\n spin_unlock(&sk->sk_receive_queue.lock)\n consume_skb(skb) [frees the SKB]\n `tail != last`: false\n `tail`: true\n `tail->len != last_len` ***UAF***\n```\n\nFix the UAF by removing the read of tail->len; checking tail->len would\nonly make sense if SKBs in the receive queue of a UNIX socket could grow,\nwhich can no longer happen.\n\nKuniyuki explained:\n\n> When commit 869e7c62486e (\"net: af_unix: implement stream sendpage\n> support\") added sendpage() support, data could be appended to the last\n> skb in the receiver's queue.\n>\n> That's why we needed to check if the length of the last skb was changed\n> while waiting for new data in unix_stream_data_wait().\n>\n> However, commit a0dbf5f818f9 (\"af_unix: Support MSG_SPLICE_PAGES\") and\n> commit 57d44a354a43 (\"unix: Convert unix_stream_sendpage() to use\n> MSG_SPLICE_PAGES\") refactored sendmsg(), and now data is always added\n> to a new skb.\n\nThat means this fix is not suitable for kernels before 6.5."
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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:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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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 bug is reached only through local syscalls on AF_UNIX SOCK_STREAM sockets (recvmsg, splice_read, setsockopt SO_PEEK_OFF), not via any network protocol handler.\nAC:L - The attacker controls both racing threads on the same socket fd and can retry the peek/normal-recv interleaving; this is a self-induced race, not one dependent on uncontrollable kernel state.\nPR:L - Any unprivileged local user can create AF_UNIX socketpairs, set SO_PEEK_OFF, and run concurrent recv operations without capabilities, including from within user namespaces.\nUI:N - Exploitation requires no victim interaction; the attacker sets up and races their own socket endpoints programmatically.\nS:C - Successful kernel heap UAF exploitation from an unprivileged container, Android app sandbox, or user-namespace tenant crosses the sandbox boundary to compromise the host kernel.\nC:H - This is a slab use-after-free read of sk_buff->len on freed memory, which per UAF guidance enables arbitrary kernel memory disclosure and heap layout leaks.\nI:H - UAF on sk_buff objects in the kernel heap can be leveraged through heap grooming and spraying to obtain arbitrary write and kernel code execution primitives.\nA:H - The UAF read can trigger KASAN slab-use-after-free faults, kernel oops, or panic during the dereference, and repeated triggering causes denial of service."
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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/unix/af_unix.c"
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],
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"versions": [
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{
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"version": "2b514574f7e88c8498027ee366fd6e7aae5aa4b5",
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"lessThan": "26342087fac93b3932e6af61dc91ec029cb8a623",
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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": "2b514574f7e88c8498027ee366fd6e7aae5aa4b5",
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"lessThan": "38bccb927d83d7d52e5b20015a172a0b6101d11e",
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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": "2b514574f7e88c8498027ee366fd6e7aae5aa4b5",
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"lessThan": "acdff9907478e82208475b1151700d0b71dcdc63",
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"status": "affected",
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{
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"version": "2b514574f7e88c8498027ee366fd6e7aae5aa4b5",
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"lessThan": "5f162f95a95834f06a8ec6140889272ad12e842f",
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"status": "affected",
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"lessThan": "be309f8eae8b474a4a617eaae01324da996fc719",
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"status": "affected",
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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/unix/af_unix.c"
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],
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"versions": [
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{
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"version": "4.2",
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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": "4.2",
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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": "6.6.143",
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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": "6.12.92",
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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": "6.18.34",
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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": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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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",
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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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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.2",
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"versionEndExcluding": "6.6.143"
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/26342087fac93b3932e6af61dc91ec029cb8a623"
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},
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{
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"url": "https://git.kernel.org/stable/c/38bccb927d83d7d52e5b20015a172a0b6101d11e"
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},
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{
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"url": "https://git.kernel.org/stable/c/acdff9907478e82208475b1151700d0b71dcdc63"
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},
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{
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"url": "https://git.kernel.org/stable/c/5f162f95a95834f06a8ec6140889272ad12e842f"
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},
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{
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"url": "https://git.kernel.org/stable/c/be309f8eae8b474a4a617eaae01324da996fc719"
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}
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],
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"title": "af_unix: Fix UAF read of tail->len in unix_stream_data_wait()",
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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-2026-64109",
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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": "2026-10-16T15:36:24.265690Z"
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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": "2026-10-19T20:28:12.212Z"
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}
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}
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]
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}
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} |