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NVD / CVE Program· CNA Linux

CVE-2025-68186: ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up

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 6f5c4f8109fa4d0955b3712597a26b310bdc736f, aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b, b42dbef4f208326271434d5ab71c4129a3ddd1a9.

Low priority for now. Upgrade to Linux Linux 6f5c4f8109fa4d0955b3712597a26b310bdc736f, aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b, b42dbef4f208326271434d5ab71c4129a3ddd1a9 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: ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up The function ring_buffer_map_get_reader() is a bit more strict than the other get reader functions, and except for certain situations the rb_get_reader_page() should not return NULL. If it does, it triggers a warning. This warning was triggering but after looking at why, it was because another acceptable situation was happening and it wasn't checked for. If the reader catches up to the writer and there's still data to be read on the reader page, then the rb_get_reader_page() will return NULL as there's no new page to get. In this situation, the reader page should not be updated and no warning should trigger.

—No exploit Fix available
Published
Dec 16, 2025
Updated
Oct 14, 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?

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.

—

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

    • 6.10affected
    • 117c39200d9d760cbd5944bb89efb7b9c51965aa and later · before b42dbef4f208326271434d5ab71c4129a3ddd1a9affected · git
    • 117c39200d9d760cbd5944bb89efb7b9c51965aa and later · before 6f5c4f8109fa4d0955b3712597a26b310bdc736faffected · git
    • 117c39200d9d760cbd5944bb89efb7b9c51965aa and later · before aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6baffected · git
    • before 6.10not affected · semver
    • 6.12.58 and later · up to and including 6.12.*not affected · semver
    • 6.17.8 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
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.8-16.17.8-1
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-azurebefore 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.27.1.160000.2.86.12.0-160000.27.1.160000.2.8
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-obs-qabefore 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-rtbefore 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-sourcebefore 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-symsbefore 6.12.0-160000.27.16.12.0-160000.27.1
openSUSE:Leap 16.0kernel-zfcpdumpbefore 6.12.0-160000.27.16.12.0-160000.27.1
SUSE:Linux Enterprise Server 16.0kernel-azurebefore 6.12.0-160000.27.16.12.0-160000.27.1
SUSE:Linux Enterprise Server 16.0kernel-docsbefore 6.12.0-160000.27.16.12.0-160000.27.1
SUSE:Linux Enterprise Server 16.0kernel-kvmsmallbefore 6.12.0-160000.27.16.12.0-160000.27.1
SUSE:Linux Enterprise Server 16.0kernel-obs-qabefore 6.12.0-160000.27.16.12.0-160000.27.1
SUSE:Linux Enterprise Server 16.0kernel-zfcpdumpbefore 6.12.0-160000.27.16.12.0-160000.27.1
SUSE:Linux Micro 6.2kernel-64kbbefore 6.12.0-160000.27.16.12.0-160000.27.1
SUSE:Linux Micro 6.2kernel-defaultbefore 6.12.0-160000.27.16.12.0-160000.27.1
SUSE:Linux Micro 6.2kernel-default-basebefore 6.12.0-160000.27.1.160000.2.86.12.0-160000.27.1.160000.2.8
SUSE:Linux Micro 6.2kernel-rtbefore 6.12.0-160000.27.16.12.0-160000.27.1

+3

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-68184Dec 16, 2025 · drm/mediatek: Disable AFBC support on Mediatek DRM driver
    28Monitor
  • ← EarlierCVE-2025-68185Dec 16, 2025 · nfs4_setup_readdir(): insufficient locking for ->d_parent->d_inode dereferencing
    0Monitor
  • Later →CVE-2025-68187Dec 16, 2025 · net: mdio: Check regmap pointer returned by device_node_to_regmap()
    0Monitor

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 Linux6f5c4f8109fa4d0955b3712597a26b310bdc736fVendor (CNA)
Linux Linuxaa997d2d2a0b2e76f4df0f1f12829f02acb4fb6bVendor (CNA)
Linux Linuxb42dbef4f208326271434d5ab71c4129a3ddd1a9Vendor (CNA)
debian:linux6.12.63-1 · Debian:13Package registry (OSV)
opensuse:dtb-aarch646.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-azure6.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.27.1.160000.2.8 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-build6.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-qa6.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-rt6.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-source6.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-syms6.12.0-160000.27.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:kernel-64kb6.12.0-160000.27.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-azure6.12.0-160000.27.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-default6.12.0-160000.27.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-default-base6.12.0-160000.27.1.160000.2.8 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-docs6.12.0-160000.27.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.12.0-160000.27.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.27.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-obs-qa6.12.0-160000.27.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-rt6.12.0-160000.27.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-source6.12.0-160000.27.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-syms6.12.0-160000.27.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-zfcpdump6.12.0-160000.27.1 · 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✗ → ✓

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

References

Show all references (2 more)

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

All records