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NVD / CVE Program· CNA Linux

CVE-2025-37798: codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.22% (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 2f9761a94bae33d26e6a81b31b36e7d776d93dc1, 342debc12183b51773b3345ba267e9263bdfaaef, 4d55144b12e742404bb3f8fee6038bafbf45619d; 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 2f9761a94bae33d26e6a81b31b36e7d776d93dc1, 342debc12183b51773b3345ba267e9263bdfaaef, 4d55144b12e742404bb3f8fee6038bafbf45619d; 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: codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog() After making all ->qlen_notify() callbacks idempotent, now it is safe to remove the check of qlen!=0 from both fq_codel_dequeue() and codel_qdisc_dequeue().

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 2, 2025
Updated
Oct 15, 2026
EPSS
0.2% · 13th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.8
CNA · Linux
7.8
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

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When you'll hear from us

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  • 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 5.10.241
  • linux linux kernel5.11 and later · before 5.15.190
  • linux linux kernel5.16 and later · before 6.1.135
  • linux linux kernel6.2 and later · before 6.6.88
  • linux linux kernel3.5 and later · before 5.4.297
  • linux linux kernel6.13 and later · before 6.13.12
  • linux linux kernel6.14 and later · before 6.14.3
  • linux linux kernel6.7 and later · before 6.12.24
  • linux linux kernel6.15

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

    • 3.5affected
    • 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 and later · before 7a742a9506849d1c1aa71e36c89855ceddc7d58eaffected · git
    • 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 and later · before cc71a757da78dd4aa1b4a9b19cb011833730ccf2affected · git
    • 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 and later · before eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450affected · git
    • 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 and later · before 829c49b6b2ff45b043739168fd1245e4e1a91a30affected · git
    • 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 and later · before 2f9761a94bae33d26e6a81b31b36e7d776d93dc1affected · git
    • 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 and later · before 4d55144b12e742404bb3f8fee6038bafbf45619daffected · git
    • 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 and later · before e73c838c80dccb9e4f19becc11d9f3cb4a27d483affected · git
    • 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 and later · before a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31affected · git
    • 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 and later · before 342debc12183b51773b3345ba267e9263bdfaaefaffected · 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
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 15.6kernel-azurebefore 6.4.0-150600.8.48.16.4.0-150600.8.48.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.65.1.150600.12.28.46.4.0-150600.23.65.1.150600.12.28.4
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 15.6kernel-rtbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
openSUSE:Leap 15.6kernel-rt_debugbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 15.6kernel-source-azurebefore 6.4.0-150600.8.48.16.4.0-150600.8.48.1
openSUSE:Leap 15.6kernel-source-rtbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 15.6kernel-syms-azurebefore 6.4.0-150600.8.48.16.4.0-150600.8.48.1
openSUSE:Leap 15.6kernel-syms-rtbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.65.16.4.0-150600.23.65.1
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.6.16.12.0-160000.6.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.6.16.12.0-160000.6.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.6.16.12.0-160000.6.1

+93

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-2023-53143May 2, 2025 · ext4: fix another off-by-one fsmap error on 1k block filesystems
    22Monitor
  • ← EarlierCVE-2023-53144May 2, 2025 · erofs: fix wrong kunmap when using LZMA on HIGHMEM platforms
    22Monitor
  • Later →CVE-2023-53039May 2, 2025 · HID: intel-ish-hid: ipc: Fix potential use-after-free in work function
    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 Linux2f9761a94bae33d26e6a81b31b36e7d776d93dc1Vendor (CNA)
Linux Linux342debc12183b51773b3345ba267e9263bdfaaefVendor (CNA)
Linux Linux4d55144b12e742404bb3f8fee6038bafbf45619dVendor (CNA)
Linux Linux7a742a9506849d1c1aa71e36c89855ceddc7d58eVendor (CNA)
Linux Linux829c49b6b2ff45b043739168fd1245e4e1a91a30Vendor (CNA)
Linux Linuxa57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31Vendor (CNA)
Linux Linuxcc71a757da78dd4aa1b4a9b19cb011833730ccf2Vendor (CNA)
Linux Linuxe73c838c80dccb9e4f19becc11d9f3cb4a27d483Vendor (CNA)
Linux Linuxeda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450Vendor (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)
cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.05.15.200.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.135-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.65.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.65.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-azure6.4.0-150600.8.48.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.65.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.65.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.65.1.150600.12.28.4 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.65.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.65.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.65.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.65.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source-azure6.4.0-150600.8.48.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms-azure6.4.0-150600.8.48.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:kernel-64kb5.3.18-150300.59.215.1 · SUSE:Linux Enterprise Server 15 SP3-LTSSPackage registry (OSV)
suse:kernel-64kb6.4.0-150600.23.65.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-azure6.4.0-150600.8.48.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6Package registry (OSV)
suse:kernel-default5.3.18-150300.59.215.1 · SUSE:Linux Enterprise Live Patching 15 SP3Package registry (OSV)
suse:kernel-default6.4.0-150600.23.65.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)

+16

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

Weakness class (CWE)

—

CVSS vector

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

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

Change log

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

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

References

Show all references (10 more)

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

All records