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NVD / CVE Program· CNA Linux

CVE-2025-40163: sched/deadline: Stop dl_server before CPU goes offline

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux ab6c0f158508bb16d483add70b73a73f95651c33, d7fd56ed5e07e053a5eea6112d61fcaded653b87, ee6e44dfe6e50b4a5df853d933a96bdff5309e6e.

Low priority for now. Upgrade to Linux Linux ab6c0f158508bb16d483add70b73a73f95651c33, d7fd56ed5e07e053a5eea6112d61fcaded653b87, ee6e44dfe6e50b4a5df853d933a96bdff5309e6e or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: sched/deadline: Stop dl_server before CPU goes offline IBM CI tool reported kernel warning[1] when running a CPU removal operation through drmgr[2]. i.e "drmgr -c cpu -r -q 1" WARNING: CPU: 0 PID: 0 at kernel/sched/cpudeadline.c:219 cpudl_set+0x58/0x170 NIP [c0000000002b6ed8] cpudl_set+0x58/0x170 LR [c0000000002b7cb8] dl_server_timer+0x168/0x2a0 Call Trace: [c000000002c2f8c0] init_stack+0x78c0/0x8000 (unreliable) [c0000000002b7cb8] dl_server_timer+0x168/0x2a0 [c00000000034df84] __hrtimer_run_queues+0x1a4/0x390 [c00000000034f624] hrtimer_interrupt+0x124/0x300 [c00000000002a230] timer_interrupt+0x140/0x320 Git bisects to: commit 4ae8d9aa9f9d ("sched/deadline: Fix dl_server getting stuck") This happens since: - dl_server hrtimer gets enqueued close to cpu offline, when kthread_park enqueues a fair task. - CPU goes offline and drmgr removes it from cpu_present_mask. - hrtimer fires and warning is hit. Fix it by stopping the dl_server before CPU is marked dead. [1]: https://lore.kernel.org/all/8218e149-7718-4432-9312-f97297c352b9@linux.ibm.com/ [2]: https://github.com/ibm-power-utilities/powerpc-utils/tree/next/src/drmgr [sshegde: wrote the changelog and tested it]

—No exploit Fix available
Published
Nov 12, 2025
Updated
Oct 19, 2026
EPSS
0.1% · 9th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

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—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.17affected
    • 030167dcadf50a9f9dac4de6fa4c34f4f7afeed7 and later · before d7fd56ed5e07e053a5eea6112d61fcaded653b87affected · git
    • 4ae8d9aa9f9dc7137ea5e564d79c5aa5af1bc45c and later · before ab6c0f158508bb16d483add70b73a73f95651c33affected · git
    • 4ae8d9aa9f9dc7137ea5e564d79c5aa5af1bc45c and later · before ee6e44dfe6e50b4a5df853d933a96bdff5309e6eaffected · git
    • before 6.17not affected · semver
    • 6.17.5 and later · up to and including 6.17.*not affected · semver
    • 6.18 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-azurebefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.37.1.160000.2.196.12.0-160000.37.1.160000.2.19
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-obs-qabefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-rtbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-sourcebefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-symsbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-zfcpdumpbefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Enterprise Server 16.0kernel-azurebefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Enterprise Server 16.0kernel-docsbefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Enterprise Server 16.0kernel-kvmsmallbefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Enterprise Server 16.0kernel-obs-qabefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Enterprise Server 16.0kernel-zfcpdumpbefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Micro 6.2kernel-64kbbefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Micro 6.2kernel-defaultbefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Micro 6.2kernel-default-basebefore 6.12.0-160000.37.1.160000.2.196.12.0-160000.37.1.160000.2.19
SUSE:Linux Micro 6.2kernel-rtbefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Micro 6.2kernel-sourcebefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Micro Extras 6.2kernel-obs-buildbefore 6.12.0-160000.37.16.12.0-160000.37.1

+1

Same product

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Other highest-scoring records for the same primary product.

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Published before and after this one in the same product

  • ← EarlierCVE-2025-40161Nov 12, 2025 · mailbox: zynqmp-ipi: Fix SGI cleanup on unbind
    0Monitor
  • ← EarlierCVE-2025-40162Nov 12, 2025 · ASoC: amd/sdw_utils: avoid NULL deref when devm_kasprintf() fails
    0Monitor
  • Later →CVE-2025-40165Nov 12, 2025 · media: nxp: imx8-isi: m2m: Fix streaming cleanup on release
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linuxab6c0f158508bb16d483add70b73a73f95651c33Vendor (CNA)
Linux Linuxd7fd56ed5e07e053a5eea6112d61fcaded653b87Vendor (CNA)
Linux Linuxee6e44dfe6e50b4a5df853d933a96bdff5309e6eVendor (CNA)
opensuse:dtb-aarch646.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-azure6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.37.1.160000.2.19 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-build6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-qa6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-rt6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-source6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-syms6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:kernel-64kb6.12.0-160000.37.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-azure6.12.0-160000.37.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-default6.12.0-160000.37.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-default-base6.12.0-160000.37.1.160000.2.19 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-docs6.12.0-160000.37.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.12.0-160000.37.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.37.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-obs-qa6.12.0-160000.37.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-rt6.12.0-160000.37.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-source6.12.0-160000.37.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-syms6.12.0-160000.37.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-zfcpdump6.12.0-160000.37.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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