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NVD / CVE Program· CNA Linux

CVE-2025-37940: ftrace: Add cond_resched() to ftrace_graph_set_hash()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1fce9574b9d515bcb8a75379a8053e18602424e3, 42ea22e754ba4f2b86f8760ca27f6f71da2d982c, 4429535acab750d963fdc3dfcc9e0eee42f4d599; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1.

Low priority for now. Upgrade to Linux Linux 1fce9574b9d515bcb8a75379a8053e18602424e3, 42ea22e754ba4f2b86f8760ca27f6f71da2d982c, 4429535acab750d963fdc3dfcc9e0eee42f4d599; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1 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: ftrace: Add cond_resched() to ftrace_graph_set_hash() When the kernel contains a large number of functions that can be traced, the loop in ftrace_graph_set_hash() may take a lot of time to execute. This may trigger the softlockup watchdog. Add cond_resched() within the loop to allow the kernel to remain responsive even when processing a large number of functions. This matches the cond_resched() that is used in other locations of the code that iterates over all functions that can be traced.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 20, 2025
Updated
Nov 5, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-37940

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.237
  • linux linux kernel5.11 and later · before 5.15.181
  • linux linux kernel5.16 and later · before 6.1.135
  • linux linux kernel4.11 and later · before 5.4.293
  • linux linux kernel6.7 and later · before 6.12.24
  • linux linux kernel6.13 and later · before 6.13.12
  • linux linux kernel6.14 and later · before 6.14.3
  • linux linux kernel6.2 and later · before 6.6.88

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

    • 4.11affected
    • b9b0c831bed2682c2e3e9f5420fb6985549ef020 and later · before e5b4ae6f01d4a510d5725eca7254519a1093920daffected · git
    • b9b0c831bed2682c2e3e9f5420fb6985549ef020 and later · before 618655d54c5f8af5d57b77491d08c0f0ff77d114affected · git
    • b9b0c831bed2682c2e3e9f5420fb6985549ef020 and later · before dd38803c9088b848c6b56f4f6d7efc4497bfde61affected · git
    • b9b0c831bed2682c2e3e9f5420fb6985549ef020 and later · before 8dd7d7280357596ba63dfdb4c1725d9dd24bd42aaffected · git
    • b9b0c831bed2682c2e3e9f5420fb6985549ef020 and later · before 5d336ac215e5c76e43ef4bca9ba699835e53e2fdaffected · git
    • b9b0c831bed2682c2e3e9f5420fb6985549ef020 and later · before 1fce9574b9d515bcb8a75379a8053e18602424e3affected · git
    • b9b0c831bed2682c2e3e9f5420fb6985549ef020 and later · before 4429535acab750d963fdc3dfcc9e0eee42f4d599affected · git
    • b9b0c831bed2682c2e3e9f5420fb6985549ef020 and later · before 72be43ff061a889c6ee648a330a42486cafa15a6affected · git
    • b9b0c831bed2682c2e3e9f5420fb6985549ef020 and later · before 42ea22e754ba4f2b86f8760ca27f6f71da2d982caffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.135-16.1.135-1
Debian:13linuxbefore 6.12.25-16.12.25-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-37936May 20, 2025 · perf/x86/intel: KVM: Mask PEBS_ENABLE loaded for guest with vCPU's value.
    22Monitor
  • ← EarlierCVE-2025-37938May 20, 2025 · tracing: Verify event formats that have "%*p.."
    22Monitor
  • Later →CVE-2025-37944May 20, 2025 · wifi: ath12k: Fix invalid entry fetch in ath12k_dp_mon_srng_process
    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 Linux1fce9574b9d515bcb8a75379a8053e18602424e3Vendor (CNA)
Linux Linux42ea22e754ba4f2b86f8760ca27f6f71da2d982cVendor (CNA)
Linux Linux4429535acab750d963fdc3dfcc9e0eee42f4d599Vendor (CNA)
Linux Linux5d336ac215e5c76e43ef4bca9ba699835e53e2fdVendor (CNA)
Linux Linux618655d54c5f8af5d57b77491d08c0f0ff77d114Vendor (CNA)
Linux Linux72be43ff061a889c6ee648a330a42486cafa15a6Vendor (CNA)
Linux Linux8dd7d7280357596ba63dfdb4c1725d9dd24bd42aVendor (CNA)
Linux Linuxdd38803c9088b848c6b56f4f6d7efc4497bfde61Vendor (CNA)
Linux Linuxe5b4ae6f01d4a510d5725eca7254519a1093920dVendor (CNA)
azl3 kernel 6.6.85.1-4 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.92.2-1 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.135-1 · Debian:12Package 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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-667 · Improper Locking

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

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

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

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

All records