CVE-2026-31633

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2026-25526 (ENISA EUVD) · GHSA-5j64-84jf-59q3 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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).

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 24, 2026

Last Modified

October 19, 2026

Advisory Details (3)

Auto-updated Oct 27, 2026
Patch available.
Web page

rxrpc: Fix integer overflow in rxgk_verify_response() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c1e242beb6b1efc3c286f617e8d940c8fbf2ed41
Web page

rxrpc: Fix integer overflow in rxgk_verify_response() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/699e52180f4231c257821c037ed5c99d5eb0edb8
Web page

rxrpc: Fix integer overflow in rxgk_verify_response() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1f864d9daaf622aeaa774404fd51e7d6a435b046

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-virtual-6.17 (6.17.0-42.42) @ noble2026-10-30ubuntu
ubuntulinux-tools-oracle-64k-6.17 (6.17.0-1020.20) @ noble2026-10-30ubuntu
ubuntulinux-tools-nvidia-hwe-24.04 (6.17.0-1031.31) @ noble2026-10-30ubuntu
linuxKernel @ 6.18.23 (fixes >=6.16.0)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (128 versions)
  • every version up to 6.19.13-1: fixed in 6.19.13-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 28× in last 7d / 90× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 398 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 300 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 05:09 UTCEG score recompute
  2. 2026-10-30 05:09 UTCVendor advisory
  3. 2026-10-30 05:09 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-29 04:39 UTCEG score recompute
  6. 2026-10-29 04:39 UTCVendor advisory
  7. 2026-10-29 04:39 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-10-28 04:01 UTCEG score recompute
  10. 2026-10-28 04:01 UTCVendor advisory
  11. 2026-10-28 04:00 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-27 03:16 UTCEG score recompute
  14. 2026-10-27 03:16 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-25 22:41 UTCEG score recompute
  17. 2026-10-25 22:41 UTCVendor advisory
  18. 2026-10-25 22:41 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-25 14:36 UTCEG score recompute
  21. 2026-10-24 22:11 UTCEG score recompute
  22. 2026-10-24 22:11 UTCVendor advisory
  23. 2026-10-24 22:11 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-10-23 21:37 UTCEG score recompute
Show 73 more
  1. 2026-10-23 21:37 UTCVendor advisory
  2. 2026-10-23 21:37 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-10-22 20:58 UTCEG score recompute
  5. 2026-10-22 20:58 UTCVendor advisory
  6. 2026-10-22 20:58 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  8. 2026-10-21 20:27 UTCEG score recompute
  9. 2026-10-21 20:27 UTCVendor advisory
  10. 2026-10-21 20:27 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-10-20 19:57 UTCEG score recompute
  13. 2026-10-20 19:57 UTCVendor advisory
  14. 2026-10-20 19:57 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-10-19 19:26 UTCVendor advisory
  17. 2026-10-19 19:26 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-19 18:59 UTCVendor advisory
  19. 2026-10-19 18:59 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-19 17:59 UTCEG score recompute
  21. 2026-10-19 17:59 UTCVendor advisory
  22. 2026-10-19 17:59 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-10-18 17:28 UTCEG score recompute
  25. 2026-10-18 17:28 UTCVendor advisory
  26. 2026-10-18 17:28 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  27. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  28. 2026-10-18 03:48 UTCEG score recompute
  29. 2026-10-17 16:58 UTCEG score recompute
  30. 2026-10-17 16:58 UTCVendor advisory
  31. 2026-10-17 16:58 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  32. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  33. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  34. 2026-10-16 16:26 UTCVendor advisory
  35. 2026-10-16 16:26 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  36. 2026-10-16 15:29 UTCEG score recompute
  37. 2026-10-16 15:29 UTCVendor advisory
  38. 2026-10-16 15:29 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  39. 2026-10-15 16:40 UTCEG score recompute
  40. 2026-10-15 16:40 UTCVendor advisory
  41. 2026-10-15 16:40 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  42. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  43. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  44. 2026-10-14 10:43 UTCEG score recompute
  45. 2026-10-14 10:42 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  46. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  47. 2026-10-13 09:10 UTCEG score recompute
  48. 2026-10-13 09:10 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  49. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  50. 2026-10-12 16:15 UTCEG score recompute
  51. 2026-10-12 08:36 UTCGHSA enrichmentGHSA-5j64-84jf-59q3 · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-10-11 19:57 UTCEG score recompute
  53. 2026-10-11 17:10 UTCEG score recompute
  54. 2026-10-11 14:39 UTCEG score recompute
  55. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  56. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  57. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  58. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  59. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  60. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  61. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  62. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  63. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  64. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  65. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  66. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  67. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  68. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  69. 2026-09-23 08:23 UTCOSV refresh
  70. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  71. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  72. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  73. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 39th percentile

Frequently asked(5)

What is CVE-2026-31633?
CVE-2026-31633 is a critical-severity vulnerability; its CVE record was published on April 24, 2026. In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix integer overflow in rxgkverifyresponse() In rxgkverifyresponse(), 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…
When was the CVE record for CVE-2026-31633 published?
The CVE record for CVE-2026-31633 was published on April 24, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 19, 2026; the record at its source may have been updated since.
Is CVE-2026-31633 actively exploited?
CVE-2026-31633 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-31633?
CVE-2026-31633 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-31633?
A fix for CVE-2026-31633 is available: update to the fixed version the vendor names in its advisory.

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