cbcvebase.
CVE-2023-54316
published 2025-12-30

CVE-2023-54316: In the Linux kernel, the following vulnerability has been resolved: refscale: Fix uninitalized use of wait_queue_head_t Running the refscale test occasionally…

PriorityP421low2.5
EPSS
0.17%
6.3th percentile
In the Linux kernel, the following vulnerability has been resolved: refscale: Fix uninitalized use of wait_queue_head_t Running the refscale test occasionally crashes the kernel with the following error: [ 8569.952896] BUG: unable to handle page fault for address: ffffffffffffffe8 [ 8569.952900] #PF: supervisor read access in kernel mode [ 8569.952902] #PF: error_code(0x0000) - not-present page [ 8569.952904] PGD c4b048067 P4D c4b049067 PUD c4b04b067 PMD 0 [ 8569.952910] Oops: 0000 [#1] PREEMPT_RT SMP NOPTI [ 8569.952916] Hardware name: Dell Inc. PowerEdge R750/0WMWCR, BIOS 1.2.4 05/28/2021 [ 8569.952917] RIP: 0010:prepare_to_wait_event+0x101/0x190 : [ 8569.952940] Call Trace: [ 8569.952941] [ 8569.952944] ref_scale_reader+0x380/0x4a0 [refscale] [ 8569.952959] kthread+0x10e/0x130 [ 8569.952966] ret_from_fork+0x1f/0x30 [ 8569.952973] The likely cause is that init_waitqueue_head() is called after the call to the torture_create_kthread() function that creates the ref_scale_reader kthread. Although this init_waitqueue_head() call will very likely complete before this kthread is created and starts running, it is possible that the calling kthread will be delayed between the calls to torture_create_kthread() and init_waitqueue_head(). In this case, the new kthread will use the waitqueue head before it is properly initialized, which is not good for the kernel's health and well-being. The above crash happened here: static inline void __add_wait_queue(...) { : if (!(wq->flags & WQ_FLAG_PRIORITY)) <=== Crash here The offset of flags from list_head entry in wait_queue_entry is -0x18. If reader_tasks[i].wq.head.next is NULL as allocated reader_task structure is zero initialized, the instruction will try to access address 0xffffffffffffffe8, which is exactly the fault address listed above. This commit therefore invokes init_waitqueue_head() before creating the kthread.

Affected

17 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.55-1 (bookworm)linux 6.1.55-1 (bookworm)
linuxlinux——
linuxlinux>= 653ed64b01dc5989f8f579d0038e987476c2c023 < 066fbd8bc981cf49923bf828b7b4092894df577f066fbd8bc981cf49923bf828b7b4092894df577f
linuxlinux>= 653ed64b01dc5989f8f579d0038e987476c2c023 < ec9d118ad99dc6f1bc674c1e649c25533d89b9baec9d118ad99dc6f1bc674c1e649c25533d89b9ba
linuxlinux>= 653ed64b01dc5989f8f579d0038e987476c2c023 < e0322a255a2242dbe4686b6176b3c83dea490529e0322a255a2242dbe4686b6176b3c83dea490529
linuxlinux>= 653ed64b01dc5989f8f579d0038e987476c2c023 < e5de968a9032366198720eac4f368ed7e690b3efe5de968a9032366198720eac4f368ed7e690b3ef
linuxlinux>= 653ed64b01dc5989f8f579d0038e987476c2c023 < 70a2856fd1d0a040c876ba9e3f89b949ae92e4dd70a2856fd1d0a040c876ba9e3f89b949ae92e4dd
linuxlinux>= 653ed64b01dc5989f8f579d0038e987476c2c023 < f5063e8948dad7f31adb007284a5d5038ae31bb8f5063e8948dad7f31adb007284a5d5038ae31bb8
linuxlinux_kernel>= 0 < 5.10.197-15.10.197-1
linuxlinux_kernel>= 0 < 6.1.55-16.1.55-1
linuxlinux_kernel>= 0 < 6.5.3-16.5.3-1
linuxlinux_kernel>= 0 < 6.5.3-16.5.3-1
linuxlinux_kernel>= 5.11.0 < 5.15.1325.15.132
linuxlinux_kernel>= 5.16.0 < 6.1.536.1.53
linuxlinux_kernel>= 5.9.0 < 5.10.1955.10.195
linuxlinux_kernel>= 6.2.0 < 6.4.166.4.16
linuxlinux_kernel>= 6.5.0 < 6.5.36.5.3
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