CVE-2024-47696

RDMA/iwcm: Fix WARNING:at_kernel/workqueue.c:#check_flush_dependency

State: Published
Severity: 7.5 High
Published: Oct 21, 2024
Updated: Oct 15, 2026
Reserved: Sep 30, 2024

Description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/iwcm: Fix WARNING:at_kernel/workqueue.c:#check_flush_dependency

In the commit aee2424246f9 ("RDMA/iwcm: Fix a use-after-free related to destroying CM IDs"), the function flush_workqueue is invoked to flush the work queue iwcm_wq.

But at that time, the work queue iwcm_wq was created via the function alloc_ordered_workqueue without the flag WQ_MEM_RECLAIM.

Because the current process is trying to flush the whole iwcm_wq, if iwcm_wq doesn't have the flag WQ_MEM_RECLAIM, verify that the current process is not reclaiming memory or running on a workqueue which doesn't have the flag WQ_MEM_RECLAIM 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] ? check_flush_dependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.375689][ T1430] ? report_bug (lib/bug.c:180 lib/bug.c:219) [ 125.382505][ T1430] ? handle_bug (arch/x86/kernel/traps.c:239) [ 125.388987][ T1430] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1)) [ 125.395831][ T1430] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:621) [ 125.403125][ T1430] ? check_flush_dependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.410984][ T1430] ? check_flush_dependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.418764][ T1430] __flush_workqueue (kernel/workqueue.c:3970) [ 125.426021][ T1430] ? __pfx___might_resched (kernel/sched/core.c:10151) [ 125.433431][ T1430] ? destroy_cm_id (drivers/infiniband/core/iwcm.c:375) iw_cm [ 125.441209][ T1430] ? __pfx___flush_workqueue (kernel/workqueue.c:3910) [ 125.473900][ T1430] ? _raw_spin_lock_irqsave (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/spinlock_api_smp.h:111 kernel/locking/spinlock.c:162) [ 125.473909][ T1430] ? __pfx__raw_spin_lock_irqsave (kernel/locking/spinlock.c:161) [ 125.482537][ T1430] _destroy_id (drivers/infiniband/core/cma.c:2044) rdma_cm [ 125.495072][ T1430] nvme_rdma_free_queue (drivers/nvme/host/rdma.c:656 drivers/nvme/host/rdma.c:650) nvme_rdma [ 125.505827][ T1430] nvme_rdma_reset_ctrl_work (drivers/nvme/host/rdma.c:2180) nvme_rdma [ 125.505831][ T1430] process_one_work (kernel/workqueue.c:3231) [ 125.515122][ T1430] worker_thread (kernel/workqueue.c:3306 kernel/workqueue.c:3393) [ 125.515127][ T1430] ? __pfx_worker_thread (kernel/workqueue.c:3339) [ 125.531837][ T1430] kthread (kernel/kthread.c:389) [ 125.539864][ T1430] ? __pfx_kthread (kernel/kthread.c:342) [ 125.550628][ T1430] ret_from_fork (arch/x86/kernel/process.c:147) [ 125.558840][ T1430] ? __pfx_kthread (kernel/kthread.c:342) [ 125.558844][ T1430] ret_from_fork_asm (arch/x86/entry/entry_64.S:257) [ 125.566487][ T1430] </TASK> [ 125.566488][ T1430] ---[ end trace 0000000000000000 ]---

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	d91d253c87fd1efece521ff2612078a35af673c6 to before da2708a19f45b4a7278adf523837c8db21d1e2b5Affected 7f25f296fc9bd0435be14e89bf657cd615a23574 to before 29b3bbd912b8db86df7a3c180b910ccb621f5635Affected 94ee7ff99b87435ec63211f632918dc7f44dac79 to before 2efe8da2ddbf873385b4bc55366d09350b408df6Affected 557d035fe88d78dd51664f4dc0e1896c04c97cf6 to before da0392698c62397c19deb1b9e9bdf2fbb5a9420eAffected dc8074b8901caabb97c2d353abd6b4e7fa5a59a5 to before a64f30db12bdc937c5108158d98c8eab1925c548Affected ff5bbbdee08287d75d72e65b72a2b76d9637892a to before 8b7df76356d098f85f3bd2c7cf6fb43f531893d7Affected ee39384ee787e86e9db4efb843818ef0ea9cb8ae to before c8b18a75282cfd27822a8cc3c1f005c1ac8d1a58Affected aee2424246f9f1dadc33faa78990c1e2eb7826e4 to before a09dc967b3c58899e259c0aea092f421d22a0b04Affected aee2424246f9f1dadc33faa78990c1e2eb7826e4 to before 86dfdd8288907f03c18b7fb462e0e232c4f98d89Affected 4.19.320 to before 4.19.323Affected 5.4.282 to before 5.4.285Affected 5.10.224 to before 5.10.227Affected 5.15.165 to before 5.15.168Affected 6.1.103 to before 6.1.113Affected 6.6.44 to before 6.6.54Affected 6.10.3 to before 6.10.13Affected
LinuxLinux	6.11Affected before 6.11Not affected 4.19.323 through 4.19.Not affected 5.4.285 through 5.4.Not affected 5.10.227 through 5.10.Not affected 5.15.168 through 5.15.Not affected 6.1.113 through 6.1.Not affected 6.6.54 through 6.6.Not affected 6.10.13 through 6.10.Not affected 6.11.2 through 6.11.Not affected 6.12 and laterNot affected

Product

Versions

LinuxLinux

d91d253c87fd1efece521ff2612078a35af673c6 to before da2708a19f45b4a7278adf523837c8db21d1e2b5Affected
7f25f296fc9bd0435be14e89bf657cd615a23574 to before 29b3bbd912b8db86df7a3c180b910ccb621f5635Affected
94ee7ff99b87435ec63211f632918dc7f44dac79 to before 2efe8da2ddbf873385b4bc55366d09350b408df6Affected
557d035fe88d78dd51664f4dc0e1896c04c97cf6 to before da0392698c62397c19deb1b9e9bdf2fbb5a9420eAffected
dc8074b8901caabb97c2d353abd6b4e7fa5a59a5 to before a64f30db12bdc937c5108158d98c8eab1925c548Affected
ff5bbbdee08287d75d72e65b72a2b76d9637892a to before 8b7df76356d098f85f3bd2c7cf6fb43f531893d7Affected
ee39384ee787e86e9db4efb843818ef0ea9cb8ae to before c8b18a75282cfd27822a8cc3c1f005c1ac8d1a58Affected
aee2424246f9f1dadc33faa78990c1e2eb7826e4 to before a09dc967b3c58899e259c0aea092f421d22a0b04Affected
aee2424246f9f1dadc33faa78990c1e2eb7826e4 to before 86dfdd8288907f03c18b7fb462e0e232c4f98d89Affected
4.19.320 to before 4.19.323Affected
5.4.282 to before 5.4.285Affected
5.10.224 to before 5.10.227Affected
5.15.165 to before 5.15.168Affected
6.1.103 to before 6.1.113Affected
6.6.44 to before 6.6.54Affected
6.10.3 to before 6.10.13Affected

LinuxLinux

6.11Affected
before 6.11Not affected
4.19.323 through 4.19.*Not affected
5.4.285 through 5.4.*Not affected
5.10.227 through 5.10.*Not affected
5.15.168 through 5.15.*Not affected
6.1.113 through 6.1.*Not affected
6.6.54 through 6.6.*Not affected
6.10.13 through 6.10.*Not affected
6.11.2 through 6.11.*Not affected
6.12 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.