GHSA-7RXQ-5VW3-RHVG
Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-05-21 15:31In the Linux kernel, the following vulnerability has been resolved:
xen/balloon: use a kernel thread instead a workqueue
Today the Xen ballooning is done via delayed work in a workqueue. This might result in workqueue hangups being reported in case of large amounts of memory are being ballooned in one go (here 16GB):
BUG: workqueue lockup - pool cpus=6 node=0 flags=0x0 nice=0 stuck for 64s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 in-flight: 229:balloon_process pending: cache_reap workqueue events_freezable_power_: flags=0x84 pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: disk_events_workfn workqueue mm_percpu_wq: flags=0x8 pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: vmstat_update pool 12: cpus=6 node=0 flags=0x0 nice=0 hung=64s workers=3 idle: 2222 43
This can easily be avoided by using a dedicated kernel thread for doing the ballooning work.
{
"affected": [],
"aliases": [
"CVE-2021-47377"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T15:15:23Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/balloon: use a kernel thread instead a workqueue\n\nToday the Xen ballooning is done via delayed work in a workqueue. This\nmight result in workqueue hangups being reported in case of large\namounts of memory are being ballooned in one go (here 16GB):\n\nBUG: workqueue lockup - pool cpus=6 node=0 flags=0x0 nice=0 stuck for 64s!\nShowing busy workqueues and worker pools:\nworkqueue events: flags=0x0\n pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=2/256 refcnt=3\n in-flight: 229:balloon_process\n pending: cache_reap\nworkqueue events_freezable_power_: flags=0x84\n pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2\n pending: disk_events_workfn\nworkqueue mm_percpu_wq: flags=0x8\n pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2\n pending: vmstat_update\npool 12: cpus=6 node=0 flags=0x0 nice=0 hung=64s workers=3 idle: 2222 43\n\nThis can easily be avoided by using a dedicated kernel thread for doing\nthe ballooning work.",
"id": "GHSA-7rxq-5vw3-rhvg",
"modified": "2024-05-21T15:31:44Z",
"published": "2024-05-21T15:31:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47377"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/29917bbb07c30be295dece245c7c21872e1a6fbb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/372d3e6ea1e115942fdfb4b25f7003d822d071be"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6bba79c6a073741b672b0bf86a1f03c0fe47f973"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8480ed9c2bbd56fc86524998e5f2e3e22f5038f6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/922fd5b6bb13ad31ff36e86e2eba2f26d8135272"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c5d5a43dd2b649a0a290bfed00fb76d1aff89be6"
}
],
"schema_version": "1.4.0",
"severity": []
}
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