GIVE YOUR AGENT THE EVIDENCE

Set up in your agent.

One prompt to get started. Paste it into your coding agent to connect cve.new through MCP and bring vulnerability context into your workflow.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

GIVE YOUR AGENT THE EVIDENCE

Investigate in your agent.

Turn this advisory into a focused investigation. Ask your agent to check your project’s versions, explain the evidence, and suggest a compatible fix.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

cve.new
Check your stack
CVE-2026-99105unknown

sched_ext: Fix stall when a task enqueued with SCX_ENQ_LAST lands back on its CPU's local DSQ

Impact

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Linux · Linux

Other versions: unaffected

Version / rangeSource status
f0e1a0643a59bf1f922fa209cec86a170b784f3f to before 8d891c218016b6145993e082e7f732cb69dd0e29affected
f0e1a0643a59bf1f922fa209cec86a170b784f3f to before 396ba6f04da3fd1fb5a3d1c9535bef3f967f4e59affected
f0e1a0643a59bf1f922fa209cec86a170b784f3f to before 7a9df76679633cf26e0fea882a684012c6ec245aaffected
Linux version evidence

Linux · Linux

Other versions: affected

Version / rangeSource status
6.12affected
0 to before 6.12unaffected
6.18.59 through 6.18.* (inclusive)unaffected
7.2.13 through 7.2.* (inclusive)unaffected
7.3 through * (inclusive)unaffected
Linux version evidence

Original source description

In the Linux kernel, the following vulnerability has been resolved:

sched_ext: Fix stall when a task enqueued with SCX_ENQ_LAST lands back on its CPU's local DSQ

With SCX_OPS_ENQ_LAST, the last runnable task on a CPU is passed to ops.enqueue() instead of being kept running. Exiting tasks without SCX_OPS_ENQ_EXITING, migration disabled tasks without SCX_OPS_ENQ_MIGRATION_DISABLED and tasks on an offline rq skip ops.enqueue() and go straight to the local DSQ. This happens in put_prev_task_scx() after the pick has settled on idle, so nothing reschedules the CPU, which idles with the task queued until an unrelated wakeup lands on it or the watchdog fires.

scx_mitosis, which sets SCX_OPS_ENQ_LAST without SCX_OPS_ENQ_EXITING, hit this during mass cgroup teardown: exiting tasks stuck in exit_mmap() for over 40 seconds.

A task put on the local DSQ runs, as anywhere else. If the SCX_ENQ_LAST enqueue left the task on this CPU's local DSQ, set need_resched on the task being switched in, as proxy_resched_idle() does. resched_curr() would flag the task being put instead, and __schedule() clears that right after the pick.

References