HOMEVULNERABILITIESCVE-2026-31637
CRITICAL

CVE-2026-31637

Published: April 24, 2026· Updated: Apr 27, 2026

9.8
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:4.8th

Official 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.

NVD Source

Technical Analysis

CVE-2026-31637 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Linux1 product
linux kernel
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60
PATCHhttps://git.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a
PATCHhttps://git.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7d
PATCHhttps://git.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7de
PATCHhttps://git.kernel.org/stable/c/fe4447cd95623b1cfacc15f280aab73a6d7340b2

All References (5)

→
https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60Patch
→
https://git.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8aPatch
→
https://git.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7dPatch
→
https://git.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7dePatch
→
https://git.kernel.org/stable/c/fe4447cd95623b1cfacc15f280aab73a6d7340b2Patch

Quick Facts

CVE IDCVE-2026-31637
CVSS Score9.8 / 10
SeverityCRITICAL
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedApr 24, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-31637 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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