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CVE-2026-31637

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
24/04/2026
Last modified:
27/04/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> rxrpc: reject undecryptable rxkad response tickets<br /> <br /> rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then<br /> parses the buffer as plaintext without checking whether<br /> crypto_skcipher_decrypt() succeeded.<br /> <br /> A malformed RESPONSE can therefore use a non-block-aligned ticket<br /> length, make the decrypt operation fail, and still drive the ticket<br /> parser with attacker-controlled bytes.<br /> <br /> Check the decrypt result and abort the connection with RXKADBADTICKET<br /> when ticket decryption fails.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
9.80
Severity 3.x
CRITICAL

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 2.6.22.1 (including) 6.6.135 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.82 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.18.23 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.19 (including) 6.19.13 (excluding)
cpe:2.3:o:linux:linux_kernel:2.6.22:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools