CVE-2026-45927

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Require frozen map for calculating map hash Currently, bpf_map_get_info_by_fd calculates and caches the hash of the map regardless of the map's frozen state. This leads to a TOCTOU bug where userspace can call BPF_OBJ_GET_INFO_BY_FD to cache the hash and then modify the map contents before freezing. Therefore, a trusted loader can be tricked into verifying the stale hash while loading the modified contents. Fix this by returning -EPERM if the map is not frozen when the hash is requested. This ensures the hash is only generated for the final, immutable state of the map.

Overview

State: PUBLISHED
Assigner (CNA): Linux
CVSS severity: high
CVSS score: 7.8 / 10
CVSS vector: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Effective score: 7.8 / 10 HIGH source: CNA overview
CWE(s): —
Reserved: 2026-05-13
Published: 2026-05-27 12:17 UTC
Last updated: 2026-05-27 12:17 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/45xxx/CVE-2026-45927.json
Linked Threat: CVE-2026-45927 — CVE-2026-45927

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-05-27 14:17:08 UTC
NVD last modified: 2026-06-25 12:42:18 UTC
NVD CVSS v3.1: 4.7 / 10 MEDIUM source: nvd@nist.gov
NVD CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore: 1.0 / 10
Impact subscore: 3.6 / 10
EPSS score: 0.0009 (probability of exploitation in next 30 days)
EPSS percentile: 0.62% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01

NVD-assigned CWE(s): CWE-367 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-32393
Assigner: Linux
Published: May 27, 2026, 12:17:46 PM
Updated: May 27, 2026, 12:17:46 PM
EUVD base score: 0.0 / 10
EUVD-reported EPSS: 0.0900
Vendors: Linux
Products: Linux (patch: 6.19.4)

Linux (patch: 0)

Linux (ea2e6467ac36bf3d785defc89e58269b15d182f7 <a2c86aa621c22f2a7e26c654f936d65cfff0aa91)

Linux (ea2e6467ac36bf3d785defc89e58269b15d182f7 <f415e114b58fe02c41191e47f24bdabb438daf72)

Linux (patch: 7.0)

Linux (ea2e6467ac36bf3d785defc89e58269b15d182f7 <7752d36343862323bbeea4ce3adf0ec2ed86e122)

Linux (6.18)

Linux (patch: 6.18.14)
Aliases: GHSA-mx29-fw97-m6gr

ENISA description: In the Linux kernel, the following vulnerability has been resolved: bpf: Require frozen map for calculating map hash Currently, bpf_map_get_info_by_fd calculates and caches the hash of the map regardless of the map's frozen state. This leads to a TOCTOU bug where userspace can call BPF_OBJ_GET_INFO_BY_FD to cache the hash and then modify the map contents before freezing. Therefore, a trusted loader can be tricked into verifying the stale hash while loading the modified contents. Fix this by returning -EPERM if the map is not frozen when the hash is requested. This ensures the hash is only generated for the final, immutable state of the map.

EUVD references (3)

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`ea2e6467ac36bf3d785defc89e58269b15d182f7` (affected), `ea2e6467ac36bf3d785defc89e58269b15d182f7` (affected), `ea2e6467ac36bf3d785defc89e58269b15d182f7` (affected)	—
Linux	Linux	`6.18` (affected), `0` (unaffected), `6.18.14` (unaffected), `6.19.4` (unaffected), `7.0` (unaffected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

Web references (6)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

https://git.kernel.org/stable/c/7752d36343862323bbeea4ce3adf0ec2ed86e122 tenable:git.kernel.org
https://git.kernel.org/stable/c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91 tenable:git.kernel.org
https://git.kernel.org/stable/c/f415e114b58fe02c41191e47f24bdabb438daf72 tenable:git.kernel.org
https://nvd.nist.gov/vuln/detail/CVE-2026-45927 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-45927 tenable:www.cve.org
https://www.first.org/epss/ tenable:www.first.org

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://git.kernel.org/stable/c/7752d36343862323bbeea4ce3adf0ec2ed86e122 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/f415e114b58fe02c41191e47f24bdabb438daf72 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch

Remediations (17)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Microsoft and Adobe Patch Tuesday, February 2026 Security Update Review

web:blog.qualys.com

Microsoft's February 2026 Patch Tuesday focuses on closing security gaps that attackers could exploit, reinforcing the importance of timely patching in enterprise environments. Here's a quick…

2026-06-04 00:15 UTC
Critical Microsoft Exchange Server Vulnerability Actively Exploited in ...

web:cybersecuritynews.com

Microsoft Exchange Server spoofing flaw, is being actively exploited against on-premises systems before a permanent patch is available.

2026-06-04 00:15 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-06-04 00:15 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-06-04 00:15 UTC
SharePoint Has a New RCE Flaw. If You Haven't Patched Yet, Go Do That.

web:securityaffairs.com

If you're running any of these, the update is out and there's no good reason to wait. Apply the fix now, not after the next Patch Tuesday retrospective. Microsoft says exploitation is less likely for this particular flaw, but that assessment deserves some skepticism. SharePoint has a long and well-documented history of being targeted.

2026-06-04 00:15 UTC
CVE-2026-42897 Exchange OWA Mitigation M2: What Admins Must Verify

web:windowsforum.com

The mitigation name administrators should verify for CVE - 2026 -42897 is M2. Exchange Server 2016, Exchange Server 2019, and Exchange Server Subscription Edition are affected at any update level, while Exchange Online is not affected.

2026-06-04 00:15 UTC
February's Patch Tuesday release fixes 59 flaws ... - Computerworld

web:www.computerworld.com

Each month, the team at Readiness analyzes the latest Patch Tuesday updates from Microsoft and provides detailed, actionable testing guidance. The company's Patch Tuesday release for February ...

2026-06-04 00:15 UTC
Microsoft fixes six zero-days on February 2026 Patch Tuesday

web:www.csoonline.com

Microsoft highlighted six new and actively exploited vulnerabilities among the 60 fixes issued in today's February Patch Tuesday releases.

2026-06-04 00:15 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-06-04 00:15 UTC
Patch Tuesday June 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-06-04 00:15 UTC
Chrome Releases: Stable Channel Update for Desktop

web:chromereleases.googleblog.com

The Stable channel has been updated to 149..7827.114/.115 for Windows and Mac and 149..7827.114 for Linux, which will roll out over the coming days/weeks. A full list of changes in this build is available in the Log Security Fixes and Rewards Note: Access to bug details and links may be kept restricted until a majority of users are updated with a fix . We will also retain restrictions if the ...

2026-06-19 02:27 UTC
March 13, 2026—Hotpatch KB5084597 (OS Builds 26200.7982 and 26100.7982 ...

web:support.microsoft.com

The following summary outlines key issues addressed by this update. The bold text within the brackets indicates the item or area of the change. [Networking] Fixed: This update addresses a security issue in the Windows Routing and Remote Access Service (RRAS) management tool. If you connect to a malicious remote server, an attacker could disrupt the tool or run code on your device. For more ...

2026-06-19 02:27 UTC
SAP Security Patch Day - February 2026

web:support.sap.com

SAP security Patch Day Bulletin

2026-06-19 02:27 UTC
May 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft has released security updates for 130 vulnerabilities, including 30 critical, in its May 2026 Patch Tuesday rollout.

2026-06-19 02:27 UTC
Microsoft working on a fix for RoguePlanet, a flaw that grants full PC ...

web:www.malwarebytes.com

Microsoft says it's working on a fix for an unpatched Defender vulnerability that can give attackers the highest level of access on Windows.

2026-06-19 02:27 UTC
Oracle Critical Security Patch Update Advisory - May 2026

web:www.oracle.com

This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.

2026-06-19 02:27 UTC
Patch Tuesday - June 2026 - Rapid7

web:www.rapid7.com

Microsoft is publishing 200 vulnerabilities on June 2026 Patch Tuesday, including an HTTP/2 denial of service vulnerability and an elevation of privilege vulnerability in PowerToys.

2026-06-19 02:27 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-45927.json.

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    "dateReserved": "2026-05-13T15:03:33.086Z",
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