222 lines
12 KiB
JSON
222 lines
12 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-2026-89799",
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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": "2026-09-11T19:38:34.767Z",
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"datePublished": "2026-09-16T10:30:31.487Z",
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"dateUpdated": "2026-10-30T12:33:04.585Z"
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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": "2026-10-30T12:33:04.585Z"
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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: Disable preemption in bpf_get_stackid\n\nThe get_perf_callchain call needs disabled preemption plus we need\nit disabled as long as we access its returned trace entries buffer.\n\nNote the bpf_get_stackid_pe function is executed already with\npreemption disabled."
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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 - bpf_get_stackid is a tracing BPF helper (kprobe, tracepoint, raw_tp, perf_event, tracing/fentry) reached only after a local bpf(2) PROG_LOAD and attach; kernel CNA guidance classifies BPF as Local, with no network or USB path into this helper.\nAC:L - The attacker controls both sides of the race: a preemptible raw_tp/tracing program with a small STACK_TRACE map, and a same-CPU get_perf_callchain with larger max_depth that reuses the per-CPU entry after put_callchain_entry(). On PREEMPT kernels (e.g. Android) raw_tp uses migrate_disable only, so pinning and retries make the window reliably hittable.\nPR:L - Loading the required tracing programs needs CAP_BPF and CAP_PERFMON at bpf_prog_load(), and STACK_TRACE maps need CAP_BPF. Per kernel CNA guidance these are Low because BPF tokens and user namespaces can delegate them to non-init-namespace users, not only real root.\nUI:N - The attacker loads their own BPF program, attaches it to a tracepoint they can fire, and invokes bpf_get_stackid through their own syscalls or pinned threads; no victim mount, file open, or other user action is required.\nS:U - The out-of-bounds write corrupts the stack-map bucket slab inside the same host kernel security authority, enabling local privilege escalation; it does not cross a VM, IOMMU, or other distinct trust boundary.\nC:H - After put_callchain_entry(), a reused per-CPU entry can inflate trace->nr so memcpy/jhash2 and the build-id loop copy kernel instruction pointers past the attacker-sized stack_map_bucket, which is kernel memory corruption that can be turned into an arbitrary read primitive.\nI:H - Without a remaining size cap on the reused trace->nr, memcpy into the preallocated stack_map_bucket (sized to a small map value_size) or the bpf_stack_build_id store loop is an attacker-sized kernel heap OOB write, up to PERF_MAX_STACK_DEPTH frames, that can smash adjacent slab and hijack control flow.\nA:H - The same unbounded heap write past a small stack-map bucket causes a kernel oops or panic even when not fully weaponized, matching CNA guidance that any kernel crash or memory-corrupting OOB write is Availability High."
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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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"kernel/bpf/stackmap.c"
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],
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"versions": [
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{
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"version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
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"lessThan": "01fc93f670b3e759413a4d574c18ccfc636d2728",
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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": "d5a3b1f691865be576c2bffa708549b8cdccda19",
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"lessThan": "e79a70c2e97ae36bbdd371f0ce88a525f7b49f01",
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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": "d5a3b1f691865be576c2bffa708549b8cdccda19",
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"lessThan": "18c71e4b65ee60b8611fc071bdd7159f10185117",
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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": "d5a3b1f691865be576c2bffa708549b8cdccda19",
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"lessThan": "ccf481d73bce6e851cec364fe831c86fe66877cf",
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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": "d5a3b1f691865be576c2bffa708549b8cdccda19",
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"lessThan": "c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf",
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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": "d5a3b1f691865be576c2bffa708549b8cdccda19",
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"lessThan": "15f1bd8574662f1b7b26aaa2e23ebf4066f0117d",
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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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"kernel/bpf/stackmap.c"
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],
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"versions": [
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{
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"version": "4.6",
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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": "4.6",
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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": "6.12.111",
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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": "6.18.51",
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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": "7.2.5",
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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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{
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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": "4.6",
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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": "4.6",
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"versionEndExcluding": "6.6.160"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.6",
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"versionEndExcluding": "6.12.111"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.6",
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"versionEndExcluding": "6.18.51"
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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": "4.6",
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"versionEndExcluding": "7.2.5"
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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": "4.6",
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"versionEndExcluding": "7.3"
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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/01fc93f670b3e759413a4d574c18ccfc636d2728"
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},
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{
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"url": "https://git.kernel.org/stable/c/e79a70c2e97ae36bbdd371f0ce88a525f7b49f01"
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},
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{
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"url": "https://git.kernel.org/stable/c/18c71e4b65ee60b8611fc071bdd7159f10185117"
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},
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{
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"url": "https://git.kernel.org/stable/c/ccf481d73bce6e851cec364fe831c86fe66877cf"
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},
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{
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"url": "https://git.kernel.org/stable/c/c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf"
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},
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{
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"url": "https://git.kernel.org/stable/c/15f1bd8574662f1b7b26aaa2e23ebf4066f0117d"
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}
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],
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"title": "bpf: Disable preemption in bpf_get_stackid",
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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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}
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} |