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In the Linux kernel, the following vulnerability has been resolved:
sched_ext: Fix scx_enable() crash on helper kthread creation failure
A crash was observed when the sched_ext selftests runner was terminated with Ctrl+\ while test 15 was running:
NIP [c00000000028fa58] scx_enable.constprop.0+0x358/0x12b0 LR [c00000000028fa2c] scx_enable.constprop.0+0x32c/0x12b0 Call Trace: scx_enable.constprop.0+0x32c/0x12b0 (unreliable) bpf_struct_ops_link_create+0x18c/0x22c __sys_bpf+0x23f8/0x3044 sys_bpf+0x2c/0x6c system_call_exception+0x124/0x320 system_call_vectored_common+0x15c/0x2ec
kthread_run_worker() returns an ERR_PTR() on failure rather than NULL, but the current code in scx_alloc_and_add_sched() only checks for a NULL helper. Incase of failure on SIGQUIT, the error is not handled in scx_alloc_and_add_sched() and scx_enable() ends up dereferencing an error pointer.
Error handling is fixed in scx_alloc_and_add_sched() to propagate PTR_ERR() into ret, so that scx_enable() jumps to the existing error path, avoiding random dereference on failure.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Ubuntu | — | Upgrade linux-image-6.17.0-19-generic-64kUpgrade linux-image-awsUpgrade linux-image-raspiUpgrade linux-image-6.17.0-1009-oracle-64kUpgrade linux-image-oracle-6.17Upgrade linux-image-aws-6.17Upgrade linux-image-gcp-6.17Upgrade linux-image-gcp-64k-6.17Upgrade linux-image-realtime-hwe-24.04Upgrade linux-image-6.17.0-1009-aws-64kUpgrade linux-image-6.17.0-1010-azureUpgrade linux-image-generic-64k-6.17Upgrade linux-image-gcp-64kUpgrade linux-image-6.17.0-1009-oracleUpgrade linux-image-6.17.0-1009-awsUpgrade linux-image-azureUpgrade linux-image-aws-64k-6.17Upgrade linux-image-oracle-64k-6.17Upgrade linux-image-realtime-6.17Upgrade linux-image-realtimeUpgrade linux-image-azure-6.17Upgrade linux-image-virtual-6.17Upgrade linux-image-oracle-64kUpgrade linux-image-generic-64kUpgrade linux-image-6.17.0-1008-realtimeUpgrade linux-image-aws-64kUpgrade linux-image-virtualUpgrade linux-image-generic-6.17Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.17.0-19-genericUpgrade linux-image-oem-6.17Upgrade linux-image-gcpUpgrade linux-image-6.17.0-1009-gcpUpgrade linux-image-6.17.0-1010-raspiUpgrade linux-image-6.17.0-1009-gcp-64kUpgrade linux-image-genericUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oracleUpgrade linux-image-oem-24.04dUpgrade linux-image-oem-24.04bUpgrade linux-image-oem-24.04aUpgrade linux-image-oem-24.04Upgrade linux-image-6.17.0-1017-oemUpgrade linux-image-raspi-6.17Upgrade linux-image-oem-24.04cUpgrade linux-image-generic-hwe-24.04 | Mar 17, 2026 | Dec 4, 2025 |
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