by Kastro
Paper/Archive/CVE-2026-31633

CVE-2026-31633

Linux Linux — rxrpc: Fix integer overflow in rxgk_verify_response()

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 40.6.406 × 208.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix integer overflow in rxgk_verify_response() In rxgk_verify_response(), there's a potential integer overflow due to rounding up token_len before checking it, thereby allowing the length check to be bypassed. Fix this by checking the unrounded value against len too (len is limited as the response must fit in a single UDP packet).

Affected

ProductAffectedFixed inSource
Linux9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a – < 1f864d9daaf622aeaa774404fd51e7d6a435b0461f864d9daaf622aeaa774404fd51e7d6a435b046CNA
Linux9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a – < c1e242beb6b1efc3c286f617e8d940c8fbf2ed41c1e242beb6b1efc3c286f617e8d940c8fbf2ed41CNA
Linux9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a – < 699e52180f4231c257821c037ed5c99d5eb0edb8699e52180f4231c257821c037ed5c99d5eb0edb8CNA
Linux6.166.18.23CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgit.kernel.org/stable/c/1f864d9daaf622aeaa774404fd51e7d6a435b046refgit.kernel.org/stable/c/c1e242beb6b1efc3c286f617e8d940c8fbf2ed41refgit.kernel.org/stable/c/699e52180f4231c257821c037ed5c99d5eb0edb8