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NVD / CVE Program· CNA Linux

CVE-2025-38550: ipv6: mcast: Delay put pmc->idev in mld_del_delrec()

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 1b5b413094af8d88a31b5df3fd262f6baca53841, 5f18e0130194550dff734e155029ae734378b5ea, 6e4eec86fe5f6b3fdbc702d1d36ac2a6e7ec0806; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1; cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 5.15.200.1-1.

Low priority for now. Upgrade to Linux Linux 1b5b413094af8d88a31b5df3fd262f6baca53841, 5f18e0130194550dff734e155029ae734378b5ea, 6e4eec86fe5f6b3fdbc702d1d36ac2a6e7ec0806; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1; cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 5.15.200.1-1 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: ipv6: mcast: Delay put pmc->idev in mld_del_delrec() pmc->idev is still used in ip6_mc_clear_src(), so as mld_clear_delrec() does, the reference should be put after ip6_mc_clear_src() return.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 16, 2025
Updated
Aug 5, 2026
EPSS
0.1% · 6th 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 · 0.1%

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

  • 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 kernel5.16 and later · before 6.1.147
  • linux linux kernel6.2 and later · before 6.6.100
  • linux linux kernel5.13 and later · before 5.15.190
  • linux linux kernel6.13 and later · before 6.15.8
  • linux linux kernel6.7 and later · before 6.12.40
  • linux linux kernel6.16

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

    • 5.13affected
    • b564ec4491d24b40900c64ab9e29a208f17f3108 and later · before 1b5b413094af8d88a31b5df3fd262f6baca53841affected · git
    • 63ed8de4be81b699ca727e9f8e3344bd487806d7 and later · before 6e4eec86fe5f6b3fdbc702d1d36ac2a6e7ec0806affected · git
    • 63ed8de4be81b699ca727e9f8e3344bd487806d7 and later · before 728db00a14cacb37f36e9382ab5fad55caf890ccaffected · git
    • 63ed8de4be81b699ca727e9f8e3344bd487806d7 and later · before dcbc346f50a009d8b7f4e330f9f2e22d6442fa26affected · git
    • 63ed8de4be81b699ca727e9f8e3344bd487806d7 and later · before 7929d27c747eafe8fca3eecd74a334503ee4c839affected · git
    • 63ed8de4be81b699ca727e9f8e3344bd487806d7 and later · before 5f18e0130194550dff734e155029ae734378b5eaaffected · git
    • 63ed8de4be81b699ca727e9f8e3344bd487806d7 and later · before ae3264a25a4635531264728859dbe9c659fad554affected · git
    • before 5.13not affected · semver
    • 5.15.190 and later · up to and including 5.15.*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 6.12.0-55.33.1.el10_06.12.0-55.33.1.el10_0
AlmaLinux:10kernel-docbefore 6.12.0-55.33.1.el10_06.12.0-55.33.1.el10_0
AlmaLinux:9kernelbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64kbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-corebefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-debugbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-develbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-corebefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-cross-headersbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-debugbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-debug-corebefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-debug-develbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-570.44.1.el9_65.14.0-570.44.1.el9_6

+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-2025-38548Aug 16, 2025 · hwmon: (corsair-cpro) Validate the size of the received input buffer
    31Monitor
  • ← EarlierCVE-2025-38549Aug 16, 2025 · efivarfs: Fix memory leak of efivarfs_fs_info in fs_context error paths
    22Monitor
  • Later →CVE-2025-38551Aug 16, 2025 · virtio-net: fix recursived rtnl_lock() during probe()
    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 Linux1b5b413094af8d88a31b5df3fd262f6baca53841Vendor (CNA)
Linux Linux5f18e0130194550dff734e155029ae734378b5eaVendor (CNA)
Linux Linux6e4eec86fe5f6b3fdbc702d1d36ac2a6e7ec0806Vendor (CNA)
Linux Linux728db00a14cacb37f36e9382ab5fad55caf890ccVendor (CNA)
Linux Linux7929d27c747eafe8fca3eecd74a334503ee4c839Vendor (CNA)
Linux Linuxae3264a25a4635531264728859dbe9c659fad554Vendor (CNA)
Linux Linuxdcbc346f50a009d8b7f4e330f9f2e22d6442fa26Vendor (CNA)
azl3 kernel 6.6.96.2-2 on Azure Linux 3.06.6.104.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.05.15.200.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-570.44.1.el9_6 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.147-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-570.44.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-570.44.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-570.44.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-570.44.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-570.44.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-570.44.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-570.44.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-570.44.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+4

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. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records