UBUNTU-CVE-2024-47696: Use After Free
In the Linux kernel, the following vulnerability has been resolved: RDMA/iwcm: Fix WARNING:atkernel/workqueue.c:#checkflushdependency In the commit aee2424246f9 ("RDMA/iwcm: Fix a use-after-free related to destroying CM IDs"), the function flushworkqueue is invoked to flush the work queue iwcmwq. But at that time, the work queue iwcmwq was created via the function allocorderedworkqueue without the flag WQMEMRECLAIM. Because the current process is trying to flush the whole iwcmwq, if iwcmwq doesn't have the flag WQMEMRECLAIM, verify that the current process is not reclaiming memory or running on a workqueue which doesn't have the flag WQMEMRECLAIM as that can break forward-progress guarantee leading to a deadlock. The call trace is as below: [ 125.350876][ T1430] Call Trace: [ 125.356281][ T1430] <TASK> [ 125.361285][ T1430] ? warn (kernel/panic.c:693) [ 125.367640][ T1430] ? checkflushdependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.375689][ T1430] ? reportbug (lib/bug.c:180 lib/bug.c:219) [ 125.382505][ T1430] ? handlebug (arch/x86/kernel/traps.c:239) [ 125.388987][ T1430] ? excinvalidop (arch/x86/kernel/traps.c:260 (discriminator 1)) [ 125.395831][ T1430] ? asmexcinvalidop (arch/x86/include/asm/idtentry.h:621) [ 125.403125][ T1430] ? checkflushdependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.410984][ T1430] ? checkflushdependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.418764][ T1430] flushworkqueue (kernel/workqueue.c:3970) [ 125.426021][ T1430] ? pfxmightresched (kernel/sched/core.c:10151) [ 125.433431][ T1430] ? destroycmid (drivers/infiniband/core/iwcm.c:375) iwcm [ 125.441209][ T1430] ? pfxflushworkqueue (kernel/workqueue.c:3910) [ 125.473900][ T1430] ? rawspinlockirqsave (arch/x86/include/asm/atomic.h:107 include/linux/atomic/atomic-arch-fallback.h:2170 include/linux/atomic/atomic-instrumented.h:1302 include/asm-generic/qspinlock.h:111 include/linux/spinlock.h:187 include/linux/spinlockapismp.h:111 kernel/locking/spinlock.c:162) [ 125.473909][ T1430] ? pfxrawspinlockirqsave (kernel/locking/spinlock.c:161) [ 125.482537][ T1430] destroyid (drivers/infiniband/core/cma.c:2044) rdmacm [ 125.495072][ T1430] nvmerdmafreequeue (drivers/nvme/host/rdma.c:656 drivers/nvme/host/rdma.c:650) nvmerdma [ 125.505827][ T1430] nvmerdmaresetctrlwork (drivers/nvme/host/rdma.c:2180) nvmerdma [ 125.505831][ T1430] processonework (kernel/workqueue.c:3231) [ 125.515122][ T1430] workerthread (kernel/workqueue.c:3306 kernel/workqueue.c:3393) [ 125.515127][ T1430] ? pfxworkerthread (kernel/workqueue.c:3339) [ 125.531837][ T1430] kthread (kernel/kthread.c:389) [ 125.539864][ T1430] ? pfxkthread (kernel/kthread.c:342) [ 125.550628][ T1430] retfromfork (arch/x86/kernel/process.c:147) [ 125.558840][ T1430] ? pfxkthread (kernel/kthread.c:342) [ 125.558844][ T1430] retfromforkasm (arch/x86/entry/entry64.S:257) [ 125.566487][ T1430] </TASK> [ 125.566488][ T1430] ---[ end trace 0000000000000000 ]---
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-aws-5.4to a version that resolves this vulnerability.Fixed in 5.4.0-1142.152~18.04.1 - Upgrade
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ubuntu/linux-azure-5.4to a version that resolves this vulnerability.Fixed in 5.4.0-1145.152~18.04.1 - Upgrade
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ubuntu/linux-gcp-5.4to a version that resolves this vulnerability.Fixed in 5.4.0-1143.152~18.04.1 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 5.4.0-1086.91 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1022.25 - Upgrade
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ubuntu/linux-nvidia-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1007.7 - Upgrade
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ubuntu/linux-nvidia-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-1022.25.2 - Upgrade
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ubuntu/linux-oem-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1015.15 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 6.8.0-1020.21 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 6.8.0-1019.23 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 6.8.0-53.55.1 - Upgrade
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ubuntu/linux-raspi-realtimeto a version that resolves this vulnerability.Fixed in 6.8.0-2018.19 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 6.8.1-1016.17 - Configuration
Create iwcm_wq via alloc_ordered_workqueue with the WQ_MEM_RECLAIM flag to preserve forward-progress guarantees when the workqueue is flushed.
Linux RDMA/iwcm iwcm_wq workqueue flags = WQ_MEM_RECLAIM
Event History
Frequently Asked Questions
Which Ubuntu kernel packages are in scope?
The affected software list includes ubuntu/linux, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, ubuntu/linux-ibm, ubuntu/linux-oracle, ubuntu/linux-raspi, and ubuntu/linux-realtime.
What level of access does an attacker need?
The supplied severity vector indicates local access and low privileges are required. No user interaction is required.
What is the expected security impact?
The severity vector indicates a high availability impact, with no confidentiality or integrity impact. The described condition can break workqueue forward-progress guarantees and lead to a deadlock.