CVE-2022-48939 Information

Description

In the Linux kernel the following vulnerability has been resolved:

bpf: Add schedule points in batch ops

syzbot reported various soft lockups caused by bpf batch operations.

INFO: task kworker/1:1:27 blocked for more than 140 seconds. INFO: task hung in rcu_barrier

Nothing prevents batch ops to process huge amount of data we need to add schedule points in them.

Note that maybe_wait_bpf_programs(map) calls from generic_map_delete_batch() can be factorized by moving the call after the loop.

This will be done later in -next tree once we get this fix merged unless there is strong opinion doing this optimization sooner.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Reference

https://git.kernel.org/stable/c/7ef94bfb08fb9e73defafbd5ddef6b5a0e2ee12b https://git.kernel.org/stable/c/8628f489b749a4f9767991631921dbe3fbcdc784 https://git.kernel.org/stable/c/7e8099967d0e3ff9d1ae043e80b27fbe46c08417 https://git.kernel.org/stable/c/75134f16e7dd0007aa474b281935c5f42e79f2c8

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

LOW

Base Severity

3.3