ghsa-c64c-4m7r-82v9
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
RDMA/rxe: Fix race in do_task() when draining
When do_task() exhausts its iteration budget (!ret), it sets the state to TASK_STATE_IDLE to reschedule, without a secondary check on the current task->state. This can overwrite the TASK_STATE_DRAINING state set by a concurrent call to rxe_cleanup_task() or rxe_disable_task().
While state changes are protected by a spinlock, both rxe_cleanup_task() and rxe_disable_task() release the lock while waiting for the task to finish draining in the while(!is_done(task)) loop. The race occurs if do_task() hits its iteration limit and acquires the lock in this window. The cleanup logic may then proceed while the task incorrectly reschedules itself, leading to a potential use-after-free.
This bug was introduced during the migration from tasklets to workqueues, where the special handling for the draining case was lost.
Fix this by restoring the original pre-migration behavior. If the state is TASK_STATE_DRAINING when iterations are exhausted, set cont to 1 to force a new loop iteration. This allows the task to finish its work, so that a subsequent iteration can reach the switch statement and correctly transition the state to TASK_STATE_DRAINED, stopping the task as intended.
{
"affected": [],
"aliases": [
"CVE-2025-40061"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-28T12:15:40Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix race in do_task() when draining\n\nWhen do_task() exhausts its iteration budget (!ret), it sets the state\nto TASK_STATE_IDLE to reschedule, without a secondary check on the\ncurrent task-\u003estate. This can overwrite the TASK_STATE_DRAINING state\nset by a concurrent call to rxe_cleanup_task() or rxe_disable_task().\n\nWhile state changes are protected by a spinlock, both rxe_cleanup_task()\nand rxe_disable_task() release the lock while waiting for the task to\nfinish draining in the while(!is_done(task)) loop. The race occurs if\ndo_task() hits its iteration limit and acquires the lock in this window.\nThe cleanup logic may then proceed while the task incorrectly\nreschedules itself, leading to a potential use-after-free.\n\nThis bug was introduced during the migration from tasklets to workqueues,\nwhere the special handling for the draining case was lost.\n\nFix this by restoring the original pre-migration behavior. If the state is\nTASK_STATE_DRAINING when iterations are exhausted, set cont to 1 to\nforce a new loop iteration. This allows the task to finish its work, so\nthat a subsequent iteration can reach the switch statement and correctly\ntransition the state to TASK_STATE_DRAINED, stopping the task as intended.",
"id": "GHSA-c64c-4m7r-82v9",
"modified": "2025-10-28T12:30:17Z",
"published": "2025-10-28T12:30:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40061"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/52edccfb555142678c836c285bf5b4ec760bd043"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/660b6959c4170637f5db2279d1f71af33a49e49b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/85288bcf7ffe11e7b036edf91937bc62fd384076"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8ca7eada62fcfabf6ec1dc7468941e791c1d8729"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
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