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CVE-2026-43493— crypto: pcrypt - Fix handling of MAY_BACKLOG requests

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于对MAY_BACKLOG请求处理不当，可能导致拒绝服务。

CVSS 9.8 · Critical EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5a1436beec5744029f3ac90b6fe71a698dcd6155< ae7e95638d956d556d74b9abb9e780d3bd3dcd9e affected
5a1436beec5744029f3ac90b6fe71a698dcd6155< 1d7f07df450bac3301938fbc4251f2611be4084e affected
5a1436beec5744029f3ac90b6fe71a698dcd6155< 76641449b28979ebd6c02e9598367e119e385236 affected
5a1436beec5744029f3ac90b6fe71a698dcd6155< 9f1cbca178c03188e201ed175251372149bb25f2 affected
5a1436beec5744029f3ac90b6fe71a698dcd6155< eb34e243df57e32f4c08fa191f3602ea19076276 affected
5a1436beec5744029f3ac90b6fe71a698dcd6155< 77d55bc8675ee851ed639dc9be77325a8024cf67 affected
5a1436beec5744029f3ac90b6fe71a698dcd6155< 46271895ddfb1ba41f89f7e0dffbe9c2bcf7380a affected
5a1436beec5744029f3ac90b6fe71a698dcd6155< 915b692e6cb723aac658c25eb82c58fd81235110 affected
… +10 more rows
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I. Basic Information for CVE-2026-43493

Vulnerability Information
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Vulnerability Title
crypto: pcrypt - Fix handling of MAY_BACKLOG requests
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于对MAY_BACKLOG请求处理不当，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5a1436beec5744029f3ac90b6fe71a698dcd6155 ~ ae7e95638d956d556d74b9abb9e780d3bd3dcd9e -
Linux Linux 2.6.34 -

II. Public POCs for CVE-2026-43493

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III. Intelligence Information for CVE-2026-43493

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Patches & Fixes for CVE-2026-43493 (7)

Other References for CVE-2026-43493 (1)

Same Patch Batch · Linux · 2026-05-19 · 3 CVEs total

CVE-2026-43491 net: qrtr: ns: Limit the maximum server registration per node
CVE-2026-43492 lib/crypto: mpi: Fix integer underflow in mpi_read_raw_from_sgl()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43493

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