CVE-2023-52791

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbae1d3a05a8b99bd748168bbf8155a1d047c562e < 25eb381a736e7ae39a4245ef5c96484eb1073809affected
LinuxLinuxbae1d3a05a8b99bd748168bbf8155a1d047c562e < 25284c46b657f48c0f3880a2e0706c70d81182c0affected
LinuxLinuxbae1d3a05a8b99bd748168bbf8155a1d047c562e < f6237afabc349c1c7909db00e15d2816519e0d2baffected
LinuxLinuxbae1d3a05a8b99bd748168bbf8155a1d047c562e < 185f3617adc8fe45e40489b458f03911f0dec46caffected
LinuxLinuxbae1d3a05a8b99bd748168bbf8155a1d047c562e < 8c3fa52a46ff4d208cefb1a462ec94e0043a91e1affected
LinuxLinuxbae1d3a05a8b99bd748168bbf8155a1d047c562e < 3473cf43b9068b9dfef2f545f833f33c6a544b91affected
LinuxLinuxbae1d3a05a8b99bd748168bbf8155a1d047c562e < aa49c90894d06e18a1ee7c095edbd2f37c232d02affected
LinuxLinux5.2affected
LinuxLinux0 < 5.2unaffected
LinuxLinux5.4.262 <= 5.4.*unaffected
LinuxLinux5.10.202 <= 5.10.*unaffected
LinuxLinux5.15.140 <= 5.15.*unaffected
LinuxLinux6.1.64 <= 6.1.*unaffected
LinuxLinux6.5.13 <= 6.5.*unaffected
LinuxLinux6.6.3 <= 6.6.*unaffected
LinuxLinux6.7 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References