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NVD / CVE Program· CNA Linux

CVE-2025-38568: net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing

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: 0.17% (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 39491e859fd494d0b51adc5c7d54c8a7dcf1d198, 66fc2ebdd9d5dd6e5a9c7edeace5a61a0ab2cd86, d00e4125680f7074c4f42ce3c297336f23128e70; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1.

Low priority for now. Upgrade to Linux Linux 39491e859fd494d0b51adc5c7d54c8a7dcf1d198, 66fc2ebdd9d5dd6e5a9c7edeace5a61a0ab2cd86, d00e4125680f7074c4f42ce3c297336f23128e70; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1 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: net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing TCA_MQPRIO_TC_ENTRY_INDEX is validated using NLA_POLICY_MAX(NLA_U32, TC_QOPT_MAX_QUEUE), which allows the value TC_QOPT_MAX_QUEUE (16). This leads to a 4-byte out-of-bounds stack write in the fp[] array, which only has room for 16 elements (0–15). Fix this by changing the policy to allow only up to TC_QOPT_MAX_QUEUE - 1.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 19, 2025
Updated
Aug 5, 2026
EPSS
0.1% · 7th percentile

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 · 0.1%

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 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

Affected versions

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

  • linux linux kernel6.4 and later · before 6.6.102
  • linux linux kernel6.7 and later · before 6.12.42
  • linux linux kernel6.13 and later · before 6.15.10
  • linux linux kernel6.16 and later · before 6.16.1

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

    • 6.4affected
    • f62af20bed2d9e824f51cfc97ff01bc261f40e58 and later · before 39491e859fd494d0b51adc5c7d54c8a7dcf1d198affected · git
    • f62af20bed2d9e824f51cfc97ff01bc261f40e58 and later · before d00e4125680f7074c4f42ce3c297336f23128e70affected · git
    • f62af20bed2d9e824f51cfc97ff01bc261f40e58 and later · before 66fc2ebdd9d5dd6e5a9c7edeace5a61a0ab2cd86affected · git
    • f62af20bed2d9e824f51cfc97ff01bc261f40e58 and later · before f1a9dbcb7d17bf0abb325cdc984957cfabc59693affected · git
    • f62af20bed2d9e824f51cfc97ff01bc261f40e58 and later · before ffd2dc4c6c49ff4f1e5d34e454a6a55608104c17affected · git
    • before 6.4not affected · semver
    • 6.6.102 and later · up to and including 6.6.*not affected · semver
    • 6.12.42 and later · up to and including 6.12.*not affected · semver
    • 6.15.10 and later · up to and including 6.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-124.31.1.el10_16.12.0-124.31.1.el10_1
AlmaLinux:10kernel-docbefore 6.12.0-124.31.1.el10_16.12.0-124.31.1.el10_1
AlmaLinux:9kernelbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64kbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-corebefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-debugbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-develbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-corebefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-cross-headersbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-debugbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-debug-corebefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-debug-develbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-611.27.1.el9_75.14.0-611.27.1.el9_7

+96

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-2025-38565Aug 19, 2025 · perf/core: Exit early on perf_mmap() fail
    31Monitor
  • ← EarlierCVE-2025-38567Aug 19, 2025 · nfsd: avoid ref leak in nfsd_open_local_fh()
    18Monitor
  • Later →CVE-2025-38569Aug 19, 2025 · benet: fix BUG when creating VFs
    22Monitor

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 Linux39491e859fd494d0b51adc5c7d54c8a7dcf1d198Vendor (CNA)
Linux Linux66fc2ebdd9d5dd6e5a9c7edeace5a61a0ab2cd86Vendor (CNA)
Linux Linuxd00e4125680f7074c4f42ce3c297336f23128e70Vendor (CNA)
Linux Linuxf1a9dbcb7d17bf0abb325cdc984957cfabc59693Vendor (CNA)
Linux Linuxffd2dc4c6c49ff4f1e5d34e454a6a55608104c17Vendor (CNA)
azl3 kernel 6.6.96.2-2 on Azure Linux 3.06.6.104.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-611.27.1.el9_7 · AlmaLinux:9Package registry (OSV)
debian:linux6.12.43-1 · Debian:13Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-611.27.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+2

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)

CWE-787 · Out-of-bounds Write

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. Fix✗ → ✓

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

References

Show all references (4 more)

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

All records