CVE-2026-31637
criticalpriority · track · 0EPSS 0.006 · 48 %ileDEEUFRRUUSEPSS · scored 2026-10-26
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.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
No vendor fix yet; a mitigation is available.
- MitigationSIMATIC S7-1500 TM MFP - GNU/Linux subsystemsiemens_psirt
Limit access to the interactive shell of the additional GNU/Linux subssytem to trusted personnel only.
- MitigationSIMATIC S7-1500 TM MFP - GNU/Linux subsystemcisa_csaf_ot
Limit access to the interactive shell of the additional GNU/Linux subssytem to trusted personnel only.
- No fix availableSIMATIC S7-1500 TM MFP - GNU/Linux subsystemsiemens_psirt
Currently no fix is available
- No fix availableSIMATIC S7-1500 TM MFP - GNU/Linux subsystemcisa_csaf_ot
Currently no fix is available
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (61)
Products and version ranges known to be affected.
advisories (4)
Vendor and ecosystem advisories describing this.
- SSA-784472SSA-784472: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP V1.1.12026-10-13csaf · siemens_psirtDE
Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP V1.1.1. Siemens is preparing fixes and recommends specific mitigations for products where fixes are not or not yet available.
- WID-SEC-W-2026-1279Linux Kernel: Mehrere SchwachstellenDeutsch2026-04-26csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um nicht näher spezifizierte Angriffe durchzuführen, welche zu einem Denial-of-Service-Zustand, einer Rechteausweitung, der Ausführung von Code oder einer Speicherbeschädigung führen könnten.
- ICSA-26-295-16Siemens SIMATIC S7-1500 TM MFP2026-10-13icsa · cisa_csaf_otUS
Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP V1.1.1. Siemens is preparing fixes and recommends specific mitigations for products where fixes are not or not yet available.
- CERTFR-2026-AVI-1298Multiples vulnérabilités dans les produits SiemensFrançais2026-10-13vendor · certfrFR
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (19)
External citations — patches, advisories, analysis.
- https://nvd.nist.gov/vuln/detail/CVE-2026-31637cnnvd
- https://www.kernel.org/Patchcnnvd
- https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60enisa_euvd
- https://git.kernel.org/stable/c/252157d939d179b5d767cb860ff8fa7f8723b67aenisa_euvd
- https://git.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8aenisa_euvd
- https://git.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7denisa_euvd
- https://git.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7deenisa_euvd
- https://git.kernel.org/stable/c/a75b3b361dd481d942c5f259a82d59718a41092cenisa_euvd
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