CVE-2026-43493

CRITICAL

In the Linux kernel, the following vulnerability has been resolved: crypto: pcrypt - Fix handling of MAY_BACKLOG requests MAY_BACKLOG requests can return EBUSY. Handle them by checking for that ...

Affects 0 products across 3 vendors.

BCS6.27
CVSS 3.19.8
EPSS0.6%
Percentile43th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
◆ SAGE Intelligence — CITED Relevance Research Team

A vulnerability in the Linux kernel's pcrypt module could allow an attacker to exploit improper handling of MAY_BACKLOG requests, potentially leading to a denial of service or other unspecified impacts.

BSID: BS-2026-GLOBAL-153255-C • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2026-43493?
A vulnerability in the Linux kernel's pcrypt module could allow an attacker to exploit improper handling of MAY_BACKLOG requests, potentially leading to a denial of service or other unspecified impacts.
What is the CVSS score for CVE-2026-43493?
CVE-2026-43493 has CVSS 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 0.6%.
Is CVE-2026-43493 actively exploited?
No confirmed active exploitation of CVE-2026-43493 as of 2026-06-02.
How do I remediate CVE-2026-43493?
Priority: IMMEDIATE.
What systems are affected by CVE-2026-43493?
CVE-2026-43493 affects: Crypto, Kernel, Linux.
Vulnerability Details
CVE IDCVE-2026-43493
BSIDBS-2026-GLOBAL-153255-C BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2026-05-19
Last Modified2026-06-01
ICS Relevance0%
SourceNVD
Official Description

In the Linux kernel, the following vulnerability has been resolved: crypto: pcrypt - Fix handling of MAY_BACKLOG requests MAY_BACKLOG requests can return EBUSY. Handle them by checking for that value and filtering out EINPROGRESS notifications.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability arises from the pcrypt module not properly handling EBUSY return values from MAY_BACKLOG requests, which could be exploited to cause the system to filter out EINPROGRESS notifications incorrectly.

Exploitation Likelihood: HIGH

Affected Products
VendorProductFixed Version
Crypto — —
Kernel — —
Linux — —
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: August 2026 | Threat Age: 82 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
SHA-512 Audit Hash6cc813a1ca6bb33b4cd844d61246f04433bb7be37bfb3cc60f7ed110d6ad6f6d82a8793b072132065e6900351a1b743afd066f5dfe09e56dee849e07f5935210
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