Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2026-64587: net: ethernet: arc: emac: quiesce interrupts before requesting IRQ

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.15% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 2503d08f8a2de618e5c3a8183b250ff4a2e2d52c, 5f29dd540fe5ea3c826fc8ec759ba488b31f9707, 6fc7449773748c7b904235a09a67054d78ab1172.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2503d08f8a2de618e5c3a8183b250ff4a2e2d52c, 5f29dd540fe5ea3c826fc8ec759ba488b31f9707, 6fc7449773748c7b904235a09a67054d78ab1172 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: ethernet: arc: emac: quiesce interrupts before requesting IRQ Normal RX/TX interrupts are enabled later, in arc_emac_open(), so probe should not see interrupt delivery in the usual case. However, hardware may still present stale or latched interrupt status left by firmware or the bootloader. If probe later unwinds after devm_request_irq() has installed the handler, such a stale interrupt can still reach arc_emac_intr() during teardown and race with release of the associated net_device. Avoid that window by putting the device into a known quiescent state before requesting the IRQ: disable all EMAC interrupt sources and clear any pending EMAC interrupt status bits. This keeps the change hardware-focused and minimal, while preventing spurious IRQ delivery from leftover state.

HighCVSS 7.0 · v3.1—No exploit Fix available
Published
Aug 6, 2026
Updated
Aug 8, 2026
EPSS
0.1% · 4th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.0
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

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

Follow CVE-2026-64587

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

    • 3.11affected
    • e4f2379db6c6823c5d4a4c2c912df00c65de51d7 and later · before abd338da658d7faa8e26cfefc8f83f0066707564affected · git
    • e4f2379db6c6823c5d4a4c2c912df00c65de51d7 and later · before 5f29dd540fe5ea3c826fc8ec759ba488b31f9707affected · git
    • e4f2379db6c6823c5d4a4c2c912df00c65de51d7 and later · before 6fc7449773748c7b904235a09a67054d78ab1172affected · git
    • e4f2379db6c6823c5d4a4c2c912df00c65de51d7 and later · before 81431da777924dddaefa5c9b0ca9da4a93f9df96affected · git
    • e4f2379db6c6823c5d4a4c2c912df00c65de51d7 and later · before d0f2386f529807826e7404d40a245ee428f89f62affected · git
    • e4f2379db6c6823c5d4a4c2c912df00c65de51d7 and later · before 8efd5dcd31e22a9308b16b107a052fcd568c0a99affected · git
    • e4f2379db6c6823c5d4a4c2c912df00c65de51d7 and later · before 8f9adb3605e36f75639de529bb3d66e94194a388affected · git
    • e4f2379db6c6823c5d4a4c2c912df00c65de51d7 and later · before 2503d08f8a2de618e5c3a8183b250ff4a2e2d52caffected · git
    • before 3.11not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.10-16.19.10-1

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-2026-64584Aug 6, 2026 · usb: gadget: f_midi: cancel pending IN work before freeing the midi object
    31Monitor
  • ← EarlierCVE-2026-64585Aug 6, 2026 · can: esd_usb: kill anchored URBs before freeing netdevs
    31Monitor
  • Later →CVE-2026-64588Aug 6, 2026 · fuse-uring: fix data races on ring->ready
    31Monitor

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 Linux2503d08f8a2de618e5c3a8183b250ff4a2e2d52cVendor (CNA)
Linux Linux5f29dd540fe5ea3c826fc8ec759ba488b31f9707Vendor (CNA)
Linux Linux6fc7449773748c7b904235a09a67054d78ab1172Vendor (CNA)
Linux Linux81431da777924dddaefa5c9b0ca9da4a93f9df96Vendor (CNA)
Linux Linux8efd5dcd31e22a9308b16b107a052fcd568c0a99Vendor (CNA)
Linux Linux8f9adb3605e36f75639de529bb3d66e94194a388Vendor (CNA)
Linux Linuxabd338da658d7faa8e26cfefc8f83f0066707564Vendor (CNA)
Linux Linuxd0f2386f529807826e7404d40a245ee428f89f62Vendor (CNA)
debian:linux6.1.170-1 · 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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

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
High
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:H/PR:L/UI:N/S:U/C:H/I:H/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. 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