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NVD / CVE Program· CNA Linux

CVE-2025-68336: locking/spinlock/debug: Fix data-race in do_raw_write_lock

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.46% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 16b3590c0e1e615757dade098c8fbc0d4f040c76, 396a9270a7b90886be501611b13aa636f2e8c703, 39d2ef113416f1a4205b03fb0aa2e428d1412c77; azl3 kernel 6.6.119.3-3 on Azure Linux 3.0 6.6.121.1-1.

Low priority for now. Upgrade to Linux Linux 16b3590c0e1e615757dade098c8fbc0d4f040c76, 396a9270a7b90886be501611b13aa636f2e8c703, 39d2ef113416f1a4205b03fb0aa2e428d1412c77; azl3 kernel 6.6.119.3-3 on Azure Linux 3.0 6.6.121.1-1 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: locking/spinlock/debug: Fix data-race in do_raw_write_lock KCSAN reports: BUG: KCSAN: data-race in do_raw_write_lock / do_raw_write_lock write (marked) to 0xffff800009cf504c of 4 bytes by task 1102 on cpu 1: do_raw_write_lock+0x120/0x204 _raw_write_lock_irq do_exit call_usermodehelper_exec_async ret_from_fork read to 0xffff800009cf504c of 4 bytes by task 1103 on cpu 0: do_raw_write_lock+0x88/0x204 _raw_write_lock_irq do_exit call_usermodehelper_exec_async ret_from_fork value changed: 0xffffffff -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1103 Comm: kworker/u4:1 6.1.111 Commit 1a365e822372 ("locking/spinlock/debug: Fix various data races") has adressed most of these races, but seems to be not consistent/not complete. >From do_raw_write_lock() only debug_write_lock_after() part has been converted to WRITE_ONCE(), but not debug_write_lock_before() part. Do it now.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Dec 22, 2025
Updated
Oct 19, 2026
EPSS
0.4% · 40th percentile
CWE
—

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

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
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  • 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.

—

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

    • 3106fb78d3579c8e9c9b3040f7f7841981919624, c0911024ff927ba5c4786b507004cb615be1d776, 09226e5c38639437565af01e6009a9286a351d04, c7673f01604fa722b9d7c1e29e17cec1b8ae09c5, c120c3dbeb76305235c8e557f84d9e2d7d0f5933, 5.5affected
    • 1a365e822372ba24c9da0822bc583894f6f3d821 and later · before 8e5b2cf10844402054b52b489b525dc30cc16908affected · git
    • 1a365e822372ba24c9da0822bc583894f6f3d821 and later · before c228cb699a07a5f2d596d186bc5c314c99bb8bbfaffected · git
    • 1a365e822372ba24c9da0822bc583894f6f3d821 and later · before 93bd23524d63deb80fb85beb2e43fafeb1043d0faffected · git
    • 1a365e822372ba24c9da0822bc583894f6f3d821 and later · before 39d2ef113416f1a4205b03fb0aa2e428d1412c77affected · git
    • 1a365e822372ba24c9da0822bc583894f6f3d821 and later · before b163a5e8c703201c905d6ec7920ed79d167e8442affected · git
    • 1a365e822372ba24c9da0822bc583894f6f3d821 and later · before 16b3590c0e1e615757dade098c8fbc0d4f040c76affected · git
    • 1a365e822372ba24c9da0822bc583894f6f3d821 and later · before 396a9270a7b90886be501611b13aa636f2e8c703affected · git
    • 1a365e822372ba24c9da0822bc583894f6f3d821 and later · before c14ecb555c3ee80eeb030a4e46d00e679537f03aaffected · git
    • 4.4.209 and later · before 4.5affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.162-16.1.162-1
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.12-16.17.12-1
openSUSE:Tumbleweedkernel-sourcebefore 6.18.5-1.16.18.5-1.1

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-2025-68334Dec 22, 2025 · platform/x86/amd/pmc: Add support for Van Gogh SoC
    0Monitor
  • ← EarlierCVE-2025-68335Dec 22, 2025 · comedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()
    0Monitor
  • Later →CVE-2025-68337Dec 22, 2025 · jbd2: avoid bug_on in jbd2_journal_get_create_access() when file system corrupted
    30Monitor

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 Linux16b3590c0e1e615757dade098c8fbc0d4f040c76Vendor (CNA)
Linux Linux396a9270a7b90886be501611b13aa636f2e8c703Vendor (CNA)
Linux Linux39d2ef113416f1a4205b03fb0aa2e428d1412c77Vendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux4.5Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux8e5b2cf10844402054b52b489b525dc30cc16908Vendor (CNA)
Linux Linux93bd23524d63deb80fb85beb2e43fafeb1043d0fVendor (CNA)
Linux Linuxb163a5e8c703201c905d6ec7920ed79d167e8442Vendor (CNA)
Linux Linuxc14ecb555c3ee80eeb030a4e46d00e679537f03aVendor (CNA)
Linux Linuxc228cb699a07a5f2d596d186bc5c314c99bb8bbfVendor (CNA)
azl3 kernel 6.6.119.3-3 on Azure Linux 3.06.6.121.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.162-1 · Debian:12Package registry (OSV)
opensuse:kernel-source6.18.5-1.1 · openSUSE:TumbleweedPackage 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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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 (7 more)

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

All records