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redhatcveRedhat.comRH:CVE-2023-52791
HistoryMay 23, 2024 - 11:10 a.m.

CVE-2023-52791

2024-05-2311:10:36
redhat.com
access.redhat.com
2
linux kernel
i2c
non-atomic transfer
preemptible issue

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.3%

In the Linux kernel, the following vulnerability has been resolved: i2c: core: Run atomic i2c xfer when !preemptible Since bae1d3a05a8b, i2c transfers are non-atomic if preemption is disabled. However, non-atomic i2c transfers require preemption (e.g. in wait_for_completion() while waiting for the DMA). panic() calls preempt_disable_notrace() before calling emergency_restart(). Therefore, if an i2c device is used for the restart, the xfer should be atomic. This avoids warnings like: [ 12.667612] WARNING: CPU: 1 PID: 1 at kernel/rcu/tree_plugin.h:318 rcu_note_context_switch+0x33c/0x6b0 [ 12.676926] Voluntary context switch within RCU read-side critical section! … [ 12.742376] schedule_timeout from wait_for_completion_timeout+0x90/0x114 [ 12.749179] wait_for_completion_timeout from tegra_i2c_wait_completion+0x40/0x70 … [ 12.994527] atomic_notifier_call_chain from machine_restart+0x34/0x58 [ 13.001050] machine_restart from panic+0x2a8/0x32c Use !preemptible() instead, which is basically the same check as pre-v5.2.

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.3%

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