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

CVSS 9.8 · Critical EPSS 0.06% · P19

Affected Version Matrix 12

VendorProductVersion RangeStatus
LinuxLinux5a1436beec5744029f3ac90b6fe71a698dcd6155< 9f1cbca178c03188e201ed175251372149bb25f2affected
5a1436beec5744029f3ac90b6fe71a698dcd6155< eb34e243df57e32f4c08fa191f3602ea19076276affected
5a1436beec5744029f3ac90b6fe71a698dcd6155< 77d55bc8675ee851ed639dc9be77325a8024cf67affected
5a1436beec5744029f3ac90b6fe71a698dcd6155< 46271895ddfb1ba41f89f7e0dffbe9c2bcf7380aaffected
5a1436beec5744029f3ac90b6fe71a698dcd6155< 915b692e6cb723aac658c25eb82c58fd81235110affected
2.6.34affected
< 2.6.34unaffected
6.6.140≤ 6.6.*unaffected
… +4 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 5a1436beec5744029f3ac90b6fe71a698dcd6155 ~ 9f1cbca178c03188e201ed175251372149bb25f2 -
LinuxLinux 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 (4)

Other References for CVE-2026-43493 (1)

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

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43493

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