CVE Intelligence
High

CVE-2026-46174 — x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache

In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache Make sure resources are not improperly shared in the op cache and cause instruction corruption this way.

Published May 28, 2026 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.2% (30-day exploitation probability)+1
  • Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.18%
ahead of 7% of scored CVEs · Oct 14, 2026
Affects
Linux
Linux and 1 more
CVSS base
8.8
High · 3 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Linux Linux, Linux Linux Kernel).
  2. Apply the fixed version or the patch documented under Remediation.
  3. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Linux Linux version 4.14≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and < 1e23b30a80b14e5764657401ee2cca030525ae8e≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and < f5bc3aef7df46eaaf423d7413ab8833f704ae576≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and < 251497955f2314cd39d43191e81c6151dead4c7b≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and < ff6fc65b3bf73acc5ee71919154d830ad5431362≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and < 9109489cc8c34e50d15575a3d1ff82af586bc1aa≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and < 28f5ed477eef166d678d6966762cbc1de9b4f436≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and < 1cd85a19748b2407830376a5cbae5c0f126016e5
and 7 more ≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and < c21b90f77687075115d989e53a8ec5e2bb427ab1version 5abd1583e06b3963e5c9d915760367de86808b78version 4ba461d426490b6ed7e8298c4d3b7a13aa5d2686version 5a63725cd18fcee2af6ec46ccb856b64ad3077b4≥ 3.16.58 and < 3.17≥ 4.4.144 and < 4.5≥ 4.9.102 and < 4.10
Vulnerable CVE Program (cve.org) e CISA ADP
Linux Linux Kernel version 7.1-rc1version 7.1-rc3version 7.1-rc2≥ 6.19 and < 7.0.7≥ 4.4.144 and < 4.5≥ 4.9.102 and < 4.10≥ 4.14.1 and < 5.10.256≥ 5.11 and < 5.15.207
and 13 more ≥ 5.16 and < 6.1.173≥ 6.2 and < 6.6.139≥ 6.7 and < 6.12.88≥ 6.13 and < 6.18.30≥ 3.16.58 and < 3.17version 4.14version 4.14-rc2version 4.14-rc3version 4.14-rc4version 4.14-rc5version 4.14-rc6version 4.14-rc7version 4.14-rc8
Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
8.8 CVSS 3.1 High 2.0 6.0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database
8.8 CVSS 3.1 High — — GitHub, Inc. via GitHub Security Advisories
8.8 CVSS 3.1 High — — Linux via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67)

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.18%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · linux/linux
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • Fix documented
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVSS changed · 8.8
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Modified
    Oct 13, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVE published
    May 28, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 14, 2026 – Oct 14, 2026
  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

13 on the record

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

  • CVE-2026-99999 ipv4: validate checksum_start before completing checksum 8h
  • CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 8h
  • CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
  • CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
  • CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
  • CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No CISA SSVC assessment.
  • No CWE classification.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-46174 is "x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.8 describes technical severity. EPSS 0.18% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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