CVE-2022-49090 (GCVE-0-2022-49090)
Vulnerability from cvelistv5
Published
2025-02-26 01:54
Modified
2025-05-04 08:29
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
arch/arm64: Fix topology initialization for core scheduling
Arm64 systems rely on store_cpu_topology() to call update_siblings_masks()
to transfer the toplogy to the various cpu masks. This needs to be done
before the call to notify_cpu_starting() which tells the scheduler about
each cpu found, otherwise the core scheduling data structures are setup
in a way that does not match the actual topology.
With smt_mask not setup correctly we bail on `cpumask_weight(smt_mask) == 1`
for !leaders in:
notify_cpu_starting()
cpuhp_invoke_callback_range()
sched_cpu_starting()
sched_core_cpu_starting()
which leads to rq->core not being correctly set for !leader-rq's.
Without this change stress-ng (which enables core scheduling in its prctl
tests in newer versions -- i.e. with PR_SCHED_CORE support) causes a warning
and then a crash (trimmed for legibility):
[ 1853.805168] ------------[ cut here ]------------
[ 1853.809784] task_rq(b)->core != rq->core
[ 1853.809792] WARNING: CPU: 117 PID: 0 at kernel/sched/fair.c:11102 cfs_prio_less+0x1b4/0x1c4
...
[ 1854.015210] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010
...
[ 1854.231256] Call trace:
[ 1854.233689] pick_next_task+0x3dc/0x81c
[ 1854.237512] __schedule+0x10c/0x4cc
[ 1854.240988] schedule_idle+0x34/0x54
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/arm64/kernel/smp.c"
],
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"versions": [
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{
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"versions": [
{
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"version": "5.14"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "5.15.34",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.16.*",
"status": "unaffected",
"version": "5.16.20",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.17.*",
"status": "unaffected",
"version": "5.17.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.18",
"versionType": "original_commit_for_fix"
}
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}
],
"cpeApplicability": [
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"nodes": [
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\narch/arm64: Fix topology initialization for core scheduling\n\nArm64 systems rely on store_cpu_topology() to call update_siblings_masks()\nto transfer the toplogy to the various cpu masks. This needs to be done\nbefore the call to notify_cpu_starting() which tells the scheduler about\neach cpu found, otherwise the core scheduling data structures are setup\nin a way that does not match the actual topology.\n\nWith smt_mask not setup correctly we bail on `cpumask_weight(smt_mask) == 1`\nfor !leaders in:\n\n notify_cpu_starting()\n cpuhp_invoke_callback_range()\n sched_cpu_starting()\n sched_core_cpu_starting()\n\nwhich leads to rq-\u003ecore not being correctly set for !leader-rq\u0027s.\n\nWithout this change stress-ng (which enables core scheduling in its prctl\ntests in newer versions -- i.e. with PR_SCHED_CORE support) causes a warning\nand then a crash (trimmed for legibility):\n\n[ 1853.805168] ------------[ cut here ]------------\n[ 1853.809784] task_rq(b)-\u003ecore != rq-\u003ecore\n[ 1853.809792] WARNING: CPU: 117 PID: 0 at kernel/sched/fair.c:11102 cfs_prio_less+0x1b4/0x1c4\n...\n[ 1854.015210] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010\n...\n[ 1854.231256] Call trace:\n[ 1854.233689] pick_next_task+0x3dc/0x81c\n[ 1854.237512] __schedule+0x10c/0x4cc\n[ 1854.240988] schedule_idle+0x34/0x54"
}
],
"providerMetadata": {
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"url": "https://git.kernel.org/stable/c/87f5d66daa5f457449bb95d6b8d18bb7596aa627"
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"url": "https://git.kernel.org/stable/c/790c1567582bda8f1153015436e3330a7c6eb278"
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"url": "https://git.kernel.org/stable/c/c78a1b2d0bff678570c8dc9f14035606f5e5257d"
},
{
"url": "https://git.kernel.org/stable/c/5524cbb1bfcdff0cad0aaa9f94e6092002a07259"
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"title": "arch/arm64: Fix topology initialization for core scheduling",
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"cveId": "CVE-2022-49090",
"datePublished": "2025-02-26T01:54:46.227Z",
"dateReserved": "2025-02-26T01:49:39.249Z",
"dateUpdated": "2025-05-04T08:29:30.905Z",
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