What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-19 · updated 2026-10-19
• Weakness: CWE-390

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.

Affected products

• Linux kernel: from 2.6.34 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.86; from 6.13 before 6.18.27 — fixed in 5.10.258, 5.15.209, 6.1.175, 6.12.86, 6.18.27, 6.6.140

How to fix

Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 6.1.175, 6.12.86. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1d7f07df450bac3301938fbc4251f2611be4084e
• https://git.kernel.org/stable/c/46271895ddfb1ba41f89f7e0dffbe9c2bcf7380a
• https://git.kernel.org/stable/c/76641449b28979ebd6c02e9598367e119e385236
• https://git.kernel.org/stable/c/77d55bc8675ee851ed639dc9be77325a8024cf67
• https://git.kernel.org/stable/c/915b692e6cb723aac658c25eb82c58fd81235110
• https://git.kernel.org/stable/c/9f1cbca178c03188e201ed175251372149bb25f2
• https://git.kernel.org/stable/c/ae7e95638d956d556d74b9abb9e780d3bd3dcd9e
• https://git.kernel.org/stable/c/eb34e243df57e32f4c08fa191f3602ea19076276
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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