Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2026-97904: cpufreq: initialize policy rwsem before sysfs publication

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 27c9b491bf7604e83b50c3bbfa18a30266ff345f, 2cee937f779f69b195b37bbec1e888da9bfe9d58, 3e5d1bf4bd687beb2cb4e32a07af695455925588; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 27c9b491bf7604e83b50c3bbfa18a30266ff345f, 2cee937f779f69b195b37bbec1e888da9bfe9d58, 3e5d1bf4bd687beb2cb4e32a07af695455925588; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: cpufreq: initialize policy rwsem before sysfs publication cpufreq_policy_alloc() initializes policy->rwsem after kobject_init_and_add() has created the policy sysfs directory and its default attributes. A sysfs access can therefore reach a policy callback before the semaphore has been initialized. Initialize policy->rwsem before publishing the policy kobject so sysfs callbacks always see an initialized semaphore.

—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th 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 · 0.2%

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-97904

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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

    • 4.2affected
    • 2fc3384dc75bf7333384c7a16d12c796f61c3f56 and later · before c9d8435814f2ac533c40fe3f35d94235bc3a9443affected · git
    • 2fc3384dc75bf7333384c7a16d12c796f61c3f56 and later · before 82a54923700da5de83ce2b26c0b43f6b5005c8f1affected · git
    • 2fc3384dc75bf7333384c7a16d12c796f61c3f56 and later · before b14987a0f73777644099f47f01aba3b0f9dc6c27affected · git
    • 2fc3384dc75bf7333384c7a16d12c796f61c3f56 and later · before b22193eea2ce32c39dda5e09f9c2be2f3fd7eb4aaffected · git
    • 2fc3384dc75bf7333384c7a16d12c796f61c3f56 and later · before dc11263cb05ed519758fd135fe08d611bad1f241affected · git
    • 2fc3384dc75bf7333384c7a16d12c796f61c3f56 and later · before 27c9b491bf7604e83b50c3bbfa18a30266ff345faffected · git
    • 2fc3384dc75bf7333384c7a16d12c796f61c3f56 and later · before 2cee937f779f69b195b37bbec1e888da9bfe9d58affected · git
    • 2fc3384dc75bf7333384c7a16d12c796f61c3f56 and later · before 3e5d1bf4bd687beb2cb4e32a07af695455925588affected · git
    • before 4.2not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.7-17.2.7-1

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-2026-97902Sep 25, 2026 · fs: don't return -EINVAL for successful nested thaw
    0Monitor
  • ← EarlierCVE-2026-97903Sep 25, 2026 · exit: hold a reference to thread_pid across proc_flush_pid
    31Monitor
  • Later →CVE-2026-97905Sep 25, 2026 · cpufreq: zero-initialize policy cpumask before sysfs publication
    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 Linux27c9b491bf7604e83b50c3bbfa18a30266ff345fVendor (CNA)
Linux Linux2cee937f779f69b195b37bbec1e888da9bfe9d58Vendor (CNA)
Linux Linux3e5d1bf4bd687beb2cb4e32a07af695455925588Vendor (CNA)
Linux Linux82a54923700da5de83ce2b26c0b43f6b5005c8f1Vendor (CNA)
Linux Linuxb14987a0f73777644099f47f01aba3b0f9dc6c27Vendor (CNA)
Linux Linuxb22193eea2ce32c39dda5e09f9c2be2f3fd7eb4aVendor (CNA)
Linux Linuxc9d8435814f2ac533c40fe3f35d94235bc3a9443Vendor (CNA)
Linux Linuxdc11263cb05ed519758fd135fe08d611bad1f241Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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 (7 more)

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

All records