Vulnerability Details CVE-2025-21657
In the Linux kernel, the following vulnerability has been resolved:
sched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()
scx_ops_bypass() iterates all CPUs to re-enqueue all the scx tasks.
For each CPU, it acquires a lock using rq_lock() regardless of whether
a CPU is offline or the CPU is currently running a task in a higher
scheduler class (e.g., deadline). The rq_lock() is supposed to be used
for online CPUs, and the use of rq_lock() may trigger an unnecessary
warning in rq_pin_lock(). Therefore, replace rq_lock() to
raw_spin_rq_lock() in scx_ops_bypass().
Without this change, we observe the following warning:
===== START =====
[ 6.615205] rq->balance_callback && rq->balance_callback != &balance_push_callback
[ 6.615208] WARNING: CPU: 2 PID: 0 at kernel/sched/sched.h:1730 __schedule+0x1130/0x1c90
===== END =====
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 10.9%
CVSS Severity
CVSS v3 Score 5.5
References
Products affected by CVE-2025-21657
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cpe:2.3:o:linux:linux_kernel:6.12
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cpe:2.3:o:linux:linux_kernel:6.12.1
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cpe:2.3:o:linux:linux_kernel:6.12.2
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cpe:2.3:o:linux:linux_kernel:6.12.3
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cpe:2.3:o:linux:linux_kernel:6.12.4
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cpe:2.3:o:linux:linux_kernel:6.12.5
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cpe:2.3:o:linux:linux_kernel:6.12.6
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cpe:2.3:o:linux:linux_kernel:6.12.7
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cpe:2.3:o:linux:linux_kernel:6.12.8
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cpe:2.3:o:linux:linux_kernel:6.12.9
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cpe:2.3:o:linux:linux_kernel:6.13