CVE-2026-89753Medium· 5.5▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec() I am seeing some rcu_tasks stalls in the Meta fleet during reclaim. INFO: rcu_tasks detected stalls …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 4.7
none → medium
— → 4.7
none → medium
— → 4.7
none → medium
4.7 → 5.5
0.2% → 0.2%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec()
I am seeing some rcu_tasks stalls in the Meta fleet during reclaim.
INFO: rcu_tasks detected stalls on tasks: 0000000088620d09: .. nvcsw: 6735/6735 holdout: 1 idle_cpu: -1/8 task:GlobalCPUThread state:R running task pid:2552016 tgid:2524552 Call Trace: shrink_lruvec mem_cgroup_iter shrink_node do_try_to_free_pages try_to_free_pages __alloc_frozen_pages_noprof alloc_pages_noprof pte_alloc_one __pte_alloc handle_mm_fault
Nothing promises direct reclaim returns in bounded time, and the scan loop in shrink_lruvec() only calls cond_resched(), which is a no-op on PREEMPTION kernels. Involuntary preemption is not a Tasks-RCU quiescent state, so the reclaiming task never reports one and becomes a holdout.
Upgrade it to cond_resched_tasks_rcu_qs(), which reports a quiescent state even when cond_resched() does nothing.
PS: This has been discussed in [1]
Linux >= 8315f42295d2667a7f942f154b73a86fd7cb2227 < 4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57Linux >= 8315f42295d2667a7f942f154b73a86fd7cb2227 < 4cdc1bdf40944de5c6b118fef07ad23f07844338Linux >= 8315f42295d2667a7f942f154b73a86fd7cb2227 < a67a00a70a7c8309ca47ea157ef3e8ed3d268f5bLinux >= 8315f42295d2667a7f942f154b73a86fd7cb2227 < 029c9408049f7f582230322057b7075bea594fd5Linux >= 8315f42295d2667a7f942f154b73a86fd7cb2227 < b5391676c61d94ffe3272dcf6723738b802f79e8Linux >= 8315f42295d2667a7f942f154b73a86fd7cb2227 < 3fd50239986302cb050d3649351bcec00fa9d5abLinux >= 8315f42295d2667a7f942f154b73a86fd7cb2227 < cf3ba0911a1cf8680371ff113b90088edd01d2bbLinux >= 8315f42295d2667a7f942f154b73a86fd7cb2227 < 25f52e81216884a7444bf07a606691feb09a94e3Linux 3.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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