In the Linux kernel, the following vulnerability has been resolved: rxrpc: reject undecryptable rxkad response tickets rxkad_decrypt_ticket()… (CVE-2026-31637)
In the Linux kernel, the following vulnerability has been resolved: rxrpc: reject undecryptable rxkad response tickets rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether crypto_skcipher_decrypt() succeeded. A malformed RESPONSE can therefore use a non-block-aligned ticket length, make the decrypt operation fail, and still drive the ticket parser with attacker-controlled bytes. Check the decrypt result and abort the connection with RXKADBADTICKET when ticket decryption fails.
AI Analysis
Technical Summary
The Linux kernel's rxrpc subsystem had a vulnerability where rxkad_decrypt_ticket() did not check the success of crypto_skcipher_decrypt() before parsing the decrypted RXKAD response ticket. An attacker could send a malformed RESPONSE with a non-block-aligned ticket length causing decryption to fail, yet still have the ticket parser process attacker-controlled bytes. The fix involves verifying the decrypt result and aborting the connection with RXKADBADTICKET if decryption fails, preventing the use of undecryptable tickets.
Potential Impact
This vulnerability allows an attacker to send malformed RXKAD response tickets that bypass decryption failure checks, potentially causing the kernel to parse attacker-controlled data. This could lead to denial of service or other impacts related to improper ticket handling. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix is available and has been applied in Linux kernel versions 3.13.0-214.265 and later, 4.4.0-1156.162 and later, 4.4.0-283.317~14.04.1 and later, 4.4.0-1126.133 and later, and 4.15.0-253.265 and later. Users should update to these or later kernel versions to remediate the vulnerability.
In the Linux kernel, the following vulnerability has been resolved: rxrpc: reject undecryptable rxkad response tickets rxkad_decrypt_ticket()… (CVE-2026-31637)
Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: reject undecryptable rxkad response tickets rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether crypto_skcipher_decrypt() succeeded. A malformed RESPONSE can therefore use a non-block-aligned ticket length, make the decrypt operation fail, and still drive the ticket parser with attacker-controlled bytes. Check the decrypt result and abort the connection with RXKADBADTICKET when ticket decryption fails.
CVSS v3.1
Score 9.8critical
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's rxrpc subsystem had a vulnerability where rxkad_decrypt_ticket() did not check the success of crypto_skcipher_decrypt() before parsing the decrypted RXKAD response ticket. An attacker could send a malformed RESPONSE with a non-block-aligned ticket length causing decryption to fail, yet still have the ticket parser process attacker-controlled bytes. The fix involves verifying the decrypt result and aborting the connection with RXKADBADTICKET if decryption fails, preventing the use of undecryptable tickets.
Potential Impact
This vulnerability allows an attacker to send malformed RXKAD response tickets that bypass decryption failure checks, potentially causing the kernel to parse attacker-controlled data. This could lead to denial of service or other impacts related to improper ticket handling. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix is available and has been applied in Linux kernel versions 3.13.0-214.265 and later, 4.4.0-1156.162 and later, 4.4.0-283.317~14.04.1 and later, 4.4.0-1126.133 and later, and 4.15.0-253.265 and later. Users should update to these or later kernel versions to remediate the vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31637
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 4.0
Threat ID: 6a58b4d368715ace43dab7d8
Added to database: 07/16/2026, 10:39:15 UTC
Last enriched: 07/30/2026, 21:53:11 UTC
Last updated: 07/31/2026, 19:30:31 UTC
Views: 2
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