What is CVE-2025-40260?

CVE-2025-40260 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 6.16 onward and patched in 6.17.10 and 6.18. CVE-2025-40260 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-40260?

CVE-2025-40260 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2025-40260?

Yes, CVE-2025-40260 has been patched. Fixed versions include 6.17.10 and 6.18. If you are running Linux kernel 6.16 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-40260 actively exploited?

CVE-2025-40260 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-40260

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.

Package Linux Kernel

Published 2025-12-04

Last modified 2026-04-15

Patch available

Yes

Affected versions

Linux kernel versions 6.16 and later are affected. Fixed in 6.17.10, 6.18 and their respective stable series.

Affected from

≥ 6.16

Fixed in

✓ 6.17.10 6.17.x ✓ 6.18

References

The following references provide additional information about CVE-2025-40260 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/625e173e2a59b6cf6cbfb51c0a6bea47f3861eab
Patch
Kernel patch commit
https://git.kernel.org/stable/c/7b6216baae751369195fa3c83d434d23bcda406a
Patch

Frequently asked questions

What is CVE-2025-40260?

CVE-2025-40260 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.16 onward and has been patched in 6.17.10 and 6.18. CVE-2025-40260 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2025-40260?

Yes — CVE-2025-40260 has been patched. Fixed versions include 6.17.10 and 6.18. If you are running Linux kernel 6.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-40260 actively exploited?

No — CVE-2025-40260 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.