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CVE-2026-46331

net/sched: fix pedit partial COW leading to page cache corruption

No known exploitation. EPSS puts it in the 47th percentile. Fixed versions are out.

CVSS 3.17.8HighEPSS percentile47th0.6% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix4 products4 fixed builds listed below

Published Updated Sources: CVE.org, NVD, BDU, CSAF

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • LinuxAffected: ≥ abe35bf3be51482593076d516a680d79e5fbc8e1, < 544d857b42a1734b923040e13aa61a6fd4746cf2Upgrade to: 544d857b42a1734b923040e13aa61a6fd4746cf2Affected: ≥ b773640d5bb9e2acfd91e2695717af04d47aa116, < d5d01d35a5a7d36f7cb679b67d9cbdd5205672dcUpgrade to: d5d01d35a5a7d36f7cb679b67d9cbdd5205672dcAffected: ≥ 8b796475fd7882663a870456466a4fb315cc1bd6, < a071e057518decc5e3bec89855758f5f8786f2c5Upgrade to: a071e057518decc5e3bec89855758f5f8786f2c5Affected: ≥ 8b796475fd7882663a870456466a4fb315cc1bd6, < b685d6ef6f07a3b5ce814565a25f39f2157538a5Upgrade to: b685d6ef6f07a3b5ce814565a25f39f2157538a5 + 12 more branchesStated by: CVE record
  • Red Hat Inc. Red Hat Enterprise LinuxAffected: 8Upgrade to: not statedStated by: BDU
  • Сообщество свободного программного обеспечения Debian GNU/LinuxAffected: 11Upgrade to: not statedStated by: BDU
  • Сообщество свободного программного обеспечения LinuxAffected: до 5.15.41Upgrade to: not statedStated by: BDU

Versions as the sources state them. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

Coverage timeline

2 publishers

  1. A sandbox escape in Claude Cowork allows an AI agent to access files on macOS via a Linux kernel flaw.

    ·The Hacker News summary

  2. Linux kernel 'pedit COW' vulnerability (CVE-2026-46331) allows local unprivileged users to gain root via memory corruption; exploit and patch available.

    ·The Hacker News summary

Sourced from public security reporting — each date is when it was published, not when it happened. 3 further articles named this CVE in wider roundups without reporting it as a distinct event.

What it is

From the CVE record

Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP V1.1.1. Siemens is preparing fixes and recommends specific mitigations for products where fixes are not or not yet available.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS47th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.6% chance of exploitation activity in the next 30 days, which ranks it in the 47th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

18 events over 121 days, from the signal feeds we watch.

  1. Patch availablerecord updated
  2. Patch availablerecord updated
  3. Patch availablerecord updated
  4. Patch availablerecord updated
  5. Patch availablerecord updated
  6. Patch availablerecord updated

Affected products

And 1 more affected product. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 7.8 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 525 more references. See all after sign-in

In the news

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We'll flag the next CVE, public exploit or patch for Debian GNU/Linux, not every advisory.