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Fencer Vulns
critical 9.8

CVE-2026-31633 in the critical feed json

rxrpc: Fix integer overflow in rxgk_verify_response()

published 2026-04-24 6 mo ago modified 2026-10-19 20 d ago also EUVD-2026-25526

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

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).

Patch / fix

  • Linux Linux 6.18.23, 6.19.13, 7.0
  • linux Debian 14 6.19.13-1

debian advisories DEBIAN-CVE-2026-31633

  • linux-nvidia Ubuntu 26.04 LTS 7.0.0-1006.6
  • linux-gcp-6.17 Ubuntu 24.04 LTS 6.17.0-1022.25
  • linux-hwe-6.17 Ubuntu 24.04 LTS 6.17.0-42.42
  • linux-oem-6.17 Ubuntu 24.04 LTS 6.17.0-1032.32
  • linux-azure-6.17 Ubuntu 24.04 LTS 6.17.0-1022.22
  • linux-nvidia-6.17 Ubuntu 24.04 LTS 6.17.0-1031.31
  • linux-oracle-6.17 Ubuntu 24.04 LTS 6.17.0-1020.20
  • linux-realtime-6.17 Ubuntu Pro Realtime 24.04 LTS 6.17.0-1019.22

ubuntu advisories UBUNTU-CVE-2026-31633

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-31633 updated cvss 5.5

kernel: rxrpc: Fix integer overflow in rxgk_verify_response()

  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
24 d ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.