Vulnerability Report

CVE-2026-31431

CISA KEV Active

Title: Linux kernel crypto algif_aead fix

Other

Proof Of Concept

PoC Available for CVE-2026-31431

CWE Category NVD-CWE-noinfo

Published Date Apr 22, 2026

Modified Date Jul 15, 2026

Exploit Status Available

Score 7.8 CVSS v

Exploit Probability (EPSS)

96.27%

Vulnerability Summary

CVE-2026-31431: In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This mostly reverts commit 72548b093ee3 except for the copying of the associated data. There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.

Impacted Vendors

Reference Links

https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237 https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8

CVSS v3.1

Source Entity 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Severity HIGH

7.8

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1

Source Entity 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Severity HIGH

7.8

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-31431 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/theori-io/copy-fail-CVE-2026-31431

View Code

GitHub https://github.com/badsectorlabs/copyfail-go

View Code

GitHub https://github.com/tgies/copy-fail-c

View Code

July 15, 2026 MODIFIED