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vuln-cve/data/2025/21xxx/CVE-2025-21767.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-21767",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-12-29T08:45:45.762Z",
"datePublished": "2025-02-27T02:18:17.067Z",
"dateUpdated": "2026-11-05T20:41:42.068Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-23T15:57:06.800Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context\n\nThe following bug report happened with a PREEMPT_RT kernel:\n\n BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\n in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2012, name: kwatchdog\n preempt_count: 1, expected: 0\n RCU nest depth: 0, expected: 0\n get_random_u32+0x4f/0x110\n clocksource_verify_choose_cpus+0xab/0x1a0\n clocksource_verify_percpu.part.0+0x6b/0x330\n clocksource_watchdog_kthread+0x193/0x1a0\n\nIt is due to the fact that clocksource_verify_choose_cpus() is invoked with\npreemption disabled. This function invokes get_random_u32() to obtain\nrandom numbers for choosing CPUs. The batched_entropy_32 local lock and/or\nthe base_crng.lock spinlock in driver/char/random.c will be acquired during\nthe call. In PREEMPT_RT kernel, they are both sleeping locks and so cannot\nbe acquired in atomic context.\n\nFix this problem by using migrate_disable() to allow smp_processor_id() to\nbe reliably used without introducing atomic context. preempt_disable() is\nthen called after clocksource_verify_choose_cpus() but before the\nclocksource measurement is being run to avoid introducing unexpected\nlatency."
}
],
"affected": [
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"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"kernel/time/clocksource.c"
],
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"status": "affected",
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{
"version": "155d3c5d24ee13cafa6236b49fc02b240a511d59",
"status": "affected",
"versionType": "git"
},
{
"version": "5.10.50",
"lessThan": "5.10.235",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.12.17",
"lessThan": "5.13",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.13.2",
"lessThan": "5.14",
"status": "affected",
"versionType": "semver"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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],
"versions": [
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"version": "5.14",
"status": "affected"
},
{
"version": "0",
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"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.235",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.179",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.129",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
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},
{
"version": "6.6.79",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
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},
{
"version": "6.12.16",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
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},
{
"version": "6.13.4",
"lessThanOrEqual": "6.13.*",
"status": "unaffected",
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},
{
"version": "6.14",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "5.10.235"
},
{
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"references": [
{
"url": "https://git.kernel.org/stable/c/d9c217fadfcff7a8df58567517d1e4253f3fd243"
},
{
"url": "https://git.kernel.org/stable/c/60f54f0d4ea530950549a8263e6fdd70a40490a4"
},
{
"url": "https://git.kernel.org/stable/c/852805b6cbdb69c298a8fc9fbe79994c95106e04"
},
{
"url": "https://git.kernel.org/stable/c/8783ceeee797d9aa9cfe150690fb9d0bac8cc459"
},
{
"url": "https://git.kernel.org/stable/c/cc3d79e7c806cb57d71c28a4a35e7d7fb3265faa"
},
{
"url": "https://git.kernel.org/stable/c/0fb534187d2355f6c8f995321e76d1ccd1262ac1"
},
{
"url": "https://git.kernel.org/stable/c/6bb05a33337b2c842373857b63de5c9bf1ae2a09"
}
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"title": "clocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context",
"x_generator": {
"engine": "bippy-1.2.0"
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},
"adp": [
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"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
}
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"shortName": "CVE",
"dateUpdated": "2025-11-03T19:37:24.318Z"
}
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{
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"providerMetadata": {
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"dateUpdated": "2026-10-15T01:04:16.407Z"
},
"affected": [
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"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
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"metrics": [
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}
}
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