180 lines
9.4 KiB
JSON
180 lines
9.4 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-2026-64226",
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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": "2026-07-19T15:36:31.771Z",
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"datePublished": "2026-07-24T15:23:10.388Z",
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"dateUpdated": "2026-08-05T12:40:11.672Z"
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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": "2026-08-05T12:40:11.672Z"
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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\nsched_ext: Avoid UAF in scx_root_enable_workfn() init failure path\n\nIn scx_root_enable_workfn(), put_task_struct(p) is called before scx_error()\ndereferences p->comm and p->pid. If the iterator's reference is the last\ndrop, the task is freed synchronously and the deref becomes a UAF.\n\nMove put_task_struct() past scx_error()."
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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 vulnerable enable path is reached locally through bpf() struct_ops map preparation and BPF_LINK_CREATE, which invokes scx_enable() and scx_root_enable_workfn().\nAC:L - The attacker can make ops.init_task() return an error for a selected task while concurrently causing that task to exit, controlling both sides of the race and allowing repeated attempts.\nPR:L - Although ordinary attachment requires init-namespace CAP_BPF and CAP_PERFMON, BPF tokens can delegate the necessary struct_ops permissions to a non-init user namespace. Under the highest defensible deployment scenario, this is reachable by a locally authorized but non-administrative user.\nUI:N - The attacker can attach the scheduler and coordinate the target task's exit without requiring another user to take any action.\nS:U - The vulnerable sched_ext code and the affected kernel memory and execution context belong to the same kernel security authority.\nC:H - The freed task_struct is dereferenced through p->comm as a string and p->pid, potentially exposing reclaimed or adjacent slab contents through the sched_ext diagnostic buffer. Consistent with the required UAF guidance, confidentiality impact is High.\nI:H - The access occurs after a task_struct slab object has been freed and can be influenced through heap reuse and spraying. Applying the required higher-severity treatment for UAF conditions, potential memory-corruption and control-flow impact warrants High.\nA:H - The stale string dereference can cause a KASAN failure, invalid-memory access, kernel oops, or panic, and the attacker can repeat the controlled failure-and-exit sequence."
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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/sched/ext.c"
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],
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"versions": [
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{
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"version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
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"lessThan": "cf396941901858b0de426cdcd3974eea6a02c98c",
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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": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
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"lessThan": "45c7c4e3db8b700307313c035ea08be829a7f21b",
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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": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
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"lessThan": "57e19ba3f58a67eb924022a5a60b67fd08e5cbbd",
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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": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
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"lessThan": "9a415cc53711f2238e0f0ca8a6bcc796c003b127",
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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/sched/ext.c"
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],
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"versions": [
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{
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"version": "6.12",
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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": "6.12",
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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": "6.12.92",
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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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{
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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": "6.12",
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"versionEndExcluding": "6.12.92"
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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": "6.12",
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"versionEndExcluding": "6.18.34"
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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": "6.12",
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"versionEndExcluding": "7.0.11"
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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": "6.12",
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"versionEndExcluding": "7.1"
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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/cf396941901858b0de426cdcd3974eea6a02c98c"
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},
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{
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"url": "https://git.kernel.org/stable/c/45c7c4e3db8b700307313c035ea08be829a7f21b"
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},
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{
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"url": "https://git.kernel.org/stable/c/57e19ba3f58a67eb924022a5a60b67fd08e5cbbd"
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},
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{
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"url": "https://git.kernel.org/stable/c/9a415cc53711f2238e0f0ca8a6bcc796c003b127"
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}
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],
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"title": "sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path",
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"x_generator": {
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} |