145 lines
8.0 KiB
JSON
145 lines
8.0 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-2026-98542",
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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": "2026-09-25T10:25:14.356Z",
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"datePublished": "2026-10-18T15:18:10.035Z",
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"dateUpdated": "2026-10-19T09:21:25.599Z"
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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": "2026-10-19T09:21:25.599Z"
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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\ncgroup/cpuset: Return PERR_NOCPUS in remote_partition_enable() on subpartitions_cpus conflict\n\nWhen a remote partition is created underneath an existing local partition\nvia a non-partition (PRS_MEMBER) intermediate cgroup, update_prstate() sees\nparent->partition_root_state == PRS_MEMBER and calls\nremote_partition_enable().\n\nCommit 86888c7bd117 (\"cgroup/cpuset: Add warnings to catch inconsistency\nin exclusive CPUs\") replaced the cpumask_intersects(tmp->new_cpus,\nsubpartitions_cpus) error check in remote_partition_enable() with\nWARN_ON_ONCE(). As a result, remote_partition_enable() emits a warning\nand proceeds to enable the remote partition on CPUs that are already\nowned by the ancestor local partition in subpartitions_cpus.\n\nThis can be reproduced on Linux 7.3.0-rc3 with:\n\n mkdir -p /tmp/cg1\n mount -t cgroup2 none /tmp/cg1\n echo \"+cpuset\" > /tmp/cg1/cgroup.subtree_control\n\n mkdir /tmp/cg1/A\n echo 1 > /tmp/cg1/A/cpuset.cpus\n echo 1 > /tmp/cg1/A/cpuset.cpus.exclusive\n echo root > /tmp/cg1/A/cpuset.cpus.partition\n echo \"+cpuset\" > /tmp/cg1/A/cgroup.subtree_control\n\n mkdir /tmp/cg1/A/B\n echo 1 > /tmp/cg1/A/B/cpuset.cpus\n echo 1 > /tmp/cg1/A/B/cpuset.cpus.exclusive\n echo \"+cpuset\" > /tmp/cg1/A/B/cgroup.subtree_control\n\n mkdir /tmp/cg1/A/B/D\n echo 1 > /tmp/cg1/A/B/D/cpuset.cpus\n echo 1 > /tmp/cg1/A/B/D/cpuset.cpus.exclusive\n echo root > /tmp/cg1/A/B/D/cpuset.cpus.partition\n\nwhich triggers:\n\n WARNING: kernel/cgroup/cpuset.c:1594 at remote_partition_enable+0x1c1/0x300\n\nand leaves both /tmp/cg1/A and /tmp/cg1/A/B/D as active root partitions\nclaiming exclusive CPU 1.\n\nFix this by returning PERR_NOCPUS when tmp->new_cpus intersects\nsubpartitions_cpus in remote_partition_enable(), matching the error code\nused by remote_cpus_update() for the same subpartitions_cpus conflict, and\nadd a regression test case to\ntools/testing/selftests/cgroup/test_cpuset_prs.sh.\n\nTested in QEMU on Linux 7.3.0-rc3 using the reproducer above and\ntools/testing/selftests/cgroup/test_cpuset_prs.sh."
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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/cgroup/cpuset.c",
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"tools/testing/selftests/cgroup/test_cpuset_prs.sh"
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],
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"versions": [
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{
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"version": "86888c7bd117c29eab169c37e5f6bbbf583da983",
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"lessThan": "241e67b60308cdce25bba66616a109759edd1d40",
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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": "86888c7bd117c29eab169c37e5f6bbbf583da983",
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"lessThan": "0751ab665cb3dcdac224b002565f2e28461740d5",
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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": "86888c7bd117c29eab169c37e5f6bbbf583da983",
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"lessThan": "31c88350b7dd1522792f726f79607f31bb55c50f",
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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/cgroup/cpuset.c",
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"tools/testing/selftests/cgroup/test_cpuset_prs.sh"
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],
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"versions": [
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{
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"version": "6.16",
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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": "6.16",
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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": "6.18.55",
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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": "7.2.9",
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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": "6.16",
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"versionEndExcluding": "6.18.55"
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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": "6.16",
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"versionEndExcluding": "7.2.9"
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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": "6.16",
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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/241e67b60308cdce25bba66616a109759edd1d40"
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},
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{
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"url": "https://git.kernel.org/stable/c/0751ab665cb3dcdac224b002565f2e28461740d5"
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},
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{
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"url": "https://git.kernel.org/stable/c/31c88350b7dd1522792f726f79607f31bb55c50f"
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}
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],
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"title": "cgroup/cpuset: Return PERR_NOCPUS in remote_partition_enable() on subpartitions_cpus conflict",
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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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} |