222 lines
13 KiB
JSON
222 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-2024-47794",
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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": "2025-01-09T09:49:29.737Z",
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"datePublished": "2025-01-11T12:25:14.419Z",
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"dateUpdated": "2026-10-30T12:19:30.794Z"
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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": "2026-10-30T12:19:30.794Z"
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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: Prevent tailcall infinite loop caused by freplace\n\nThere is a potential infinite loop issue that can occur when using a\ncombination of tail calls and freplace.\n\nIn an upcoming selftest, the attach target for entry_freplace of\ntailcall_freplace.c is subprog_tc of tc_bpf2bpf.c, while the tail call in\nentry_freplace leads to entry_tc. This results in an infinite loop:\n\nentry_tc -> subprog_tc -> entry_freplace --tailcall-> entry_tc.\n\nThe problem arises because the tail_call_cnt in entry_freplace resets to\nzero each time entry_freplace is executed, causing the tail call mechanism\nto never terminate, eventually leading to a kernel panic.\n\nTo fix this issue, the solution is twofold:\n\n1. Prevent updating a program extended by an freplace program to a\n prog_array map.\n2. Prevent extending a program that is already part of a prog_array map\n with an freplace program.\n\nThis ensures that:\n\n* If a program or its subprogram has been extended by an freplace program,\n it can no longer be updated to a prog_array map.\n* If a program has been added to a prog_array map, neither it nor its\n subprograms can be extended by an freplace program.\n\nMoreover, an extension program should not be tailcalled. As such, return\n-EINVAL if the program has a type of BPF_PROG_TYPE_EXT when adding it to a\nprog_array map.\n\nAdditionally, fix a minor code style issue by replacing eight spaces with a\ntab for proper formatting."
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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 entire attack is built and triggered through the local `bpf(2)` syscall — two `BPF_PROG_LOAD` calls, a `BPF_LINK_CREATE` freplace attach, a `PROG_ARRAY` map update, and `BPF_PROG_TEST_RUN`. No network peer or remote input is involved, and no netdev attachment is required.\nAC:L - The attacker constructs every component of the loop (target prog, its bpf2bpf subprog, the freplace extension, and the prog_array entry) and fires it deterministically; there is no race, no memory-layout dependency, and no state outside the attacker's control. Every invocation reproduces the runaway tail-call chain.\nPR:L - Loading `BPF_PROG_TYPE_EXT` goes through `bpf_token_capable()` for CAP_BPF/CAP_NET_ADMIN/CAP_PERFMON, which grants only `ns_capable()`-level checks when a BPF token is delegated to a user namespace via bpffs `delegate_cmds`/`delegate_progs` — so a low-privileged container process with a delegated token can reach it, and no real init-namespace root is strictly needed.\nUI:N - The attacker loads, attaches, and executes the programs entirely on its own via `BPF_PROG_TEST_RUN` or by attaching the classifier and sending itself a packet. No victim action of any kind is required.\nS:U - The corruption and the crash both occur in the kernel's own stack within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The unbounded recursion is an out-of-bounds write past the kernel stack limit with attacker-chosen BPF stack contents; on builds without CONFIG_VMAP_STACK (e.g. KASAN_GENERIC configs, where `arch/Kconfig` disables it) the overflow spills into adjacent kernel memory, yielding a corruption primitive usable for disclosing kernel data.\nI:H - Same stack overflow gives an unbounded, attacker-controlled out-of-bounds write past the stack guard limit, which on non-VMAP_STACK configurations overwrites adjacent kernel structures and is leverageable for control-flow hijack; per guidance any OOB write scores High.\nA:H - The commit states the tail-call mechanism \"never terminate[s], eventually leading to a kernel panic\" — the stack grows every cycle until it hits the guard page, producing an immediate double-fault panic (or silent corruption) within microseconds, and it can be re-triggered on every packet if the classifier is attached to a live interface."
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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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"include/linux/bpf.h",
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"kernel/bpf/arraymap.c",
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"kernel/bpf/core.c",
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"kernel/bpf/syscall.c",
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"kernel/bpf/trampoline.c"
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],
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"versions": [
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{
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"version": "be8704ff07d2374bcc5c675526f95e70c6459683",
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"lessThan": "272f92998cbec9e12fea8ef28f48d6b1bc625a34",
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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": "be8704ff07d2374bcc5c675526f95e70c6459683",
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"lessThan": "f8ba0d22afa613b280fc40fcf6ae99f73c7b36e6",
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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": "be8704ff07d2374bcc5c675526f95e70c6459683",
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"lessThan": "987aa730bad3e1ef66d9f30182294daa78f6387d",
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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": "be8704ff07d2374bcc5c675526f95e70c6459683",
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"lessThan": "d6083f040d5d8f8d748462c77e90547097df936e",
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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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"include/linux/bpf.h",
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"kernel/bpf/arraymap.c",
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"kernel/bpf/core.c",
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"kernel/bpf/syscall.c",
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"kernel/bpf/trampoline.c"
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],
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"versions": [
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{
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"version": "5.6",
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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": "5.6",
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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": "6.1.191",
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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": "6.6.160",
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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": "6.12.5",
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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": "6.13",
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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": "5.6",
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"versionEndExcluding": "6.1.191"
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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": "5.6",
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"versionEndExcluding": "6.6.160"
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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": "5.6",
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"versionEndExcluding": "6.12.5"
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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": "5.6",
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"versionEndExcluding": "6.13"
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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/272f92998cbec9e12fea8ef28f48d6b1bc625a34"
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},
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{
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"url": "https://git.kernel.org/stable/c/f8ba0d22afa613b280fc40fcf6ae99f73c7b36e6"
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},
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{
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"url": "https://git.kernel.org/stable/c/987aa730bad3e1ef66d9f30182294daa78f6387d"
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},
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{
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"url": "https://git.kernel.org/stable/c/d6083f040d5d8f8d748462c77e90547097df936e"
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}
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],
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"title": "bpf: Prevent tailcall infinite loop caused by freplace",
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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-2024-47794",
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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": "2026-10-15T21:40:26.998555Z"
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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": "2026-10-15T21:41:45.247Z"
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}
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}
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]
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}
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} |