CVE-2026-31635

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-04-24. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: fix oversized RESPONSE authenticator length check

rxgk_verify_response() decodes auth_len from the packet and is supposed to verify that it fits in the remaining bytes. The existing check is inverted, so oversized RESPONSE authenticators are accepted and passed to rxgk_decrypt_skb(), which can later reach skb_to_sgvec() with an impossible length and hit BUG_ON(len).

Decoded from the original latest-net reproduction logs with scripts/decode_stacktrace.sh:

RIP: __skb_to_sgvec() [net/core/skbuff.c:5285 (discriminator 1)] Call Trace: skb_to_sgvec() [net/core/skbuff.c:5305] rxgk_decrypt_skb() [net/rxrpc/rxgk_common.h:81] rxgk_verify_response() [net/rxrpc/rxgk.c:1268] rxrpc_process_connection() [net/rxrpc/conn_event.c:266 net/rxrpc/conn_event.c:364 net/rxrpc/conn_event.c:386] process_one_work() [kernel/workqueue.c:3281] worker_thread() [kernel/workqueue.c:3353 kernel/workqueue.c:3440] kthread() [kernel/kthread.c:436] ret_from_fork() [arch/x86/kernel/process.c:164]

Reject authenticator lengths that exceed the remaining packet payload.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
50(Track*)
EG Risk 50/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
59%
KEV
Not listed

Published

April 24, 2026

Last Modified

August 5, 2026

Advisory Details (4)

Auto-updated May 18, 2026
No patch confirmed yet.
generic

pocs/dirtydecrypt at main · v12-security/pocs · GitHub

https://github.com/v12-security/pocs/tree/main/dirtydecrypt
generic

rxrpc: fix oversized RESPONSE authenticator length check - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e2f1a80d8b1ed6a5ae585a399c2b46500bdcc305
generic

rxrpc: fix oversized RESPONSE authenticator length check - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/beee051f259acd286fed64c32c2b31e6f5097eb5
generic

rxrpc: fix oversized RESPONSE authenticator length check - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a2567217ade970ecc458144b6be469bc015b23e5

Vendor Advisories for CVE-2026-31635(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.18.23—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 rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (127 versions)6.19.13-1—

Weakness Classification(1)

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

All Vendor Advisories

(8)

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 7× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 255 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-17 19:30 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-13 16:47 UTCEPSS rescore
  7. 2026-09-12 15:01 UTCEPSS rescore
  8. 2026-09-11 14:52 UTCEPSS rescore
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-08 22:00 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-04 03:16 UTCOSV refresh
  16. 2026-09-02 14:11 UTCEPSS rescore
  17. 2026-09-01 13:53 UTCEPSS rescore
  18. 2026-09-01 04:39 UTCEPSS rescore
  19. 2026-09-01 04:39 UTCEPSS rescore
  20. 2026-08-30 19:17 UTCEPSS rescore
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-28 21:41 UTCEPSS rescore
  23. 2026-08-27 14:25 UTCEPSS rescore
  24. 2026-08-26 14:46 UTCEPSS rescore
  25. 2026-08-25 13:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-24 14:17 UTCEPSS rescore
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 22:55 UTCEPSS rescore
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-18 13:48 UTCEPSS rescore
  8. 2026-08-17 14:50 UTCEG score recompute
  9. 2026-08-17 14:50 UTCVendor advisory
  10. 2026-08-17 14:50 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 05:47 UTCEG score recompute
  14. 2026-08-16 05:47 UTCVendor advisory
  15. 2026-08-16 05:47 UTCGHSA enrichment
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 02:06 UTCEG score recompute
  18. 2026-08-15 02:06 UTCVendor advisory
  19. 2026-08-15 02:06 UTCGHSA enrichment
  20. 2026-08-15 01:30 UTCEPSS rescore
  21. 2026-08-14 15:07 UTCVendor advisory
  22. 2026-08-14 15:07 UTCGHSA enrichment
  23. 2026-08-14 04:07 UTCEG score recompute
  24. 2026-08-14 04:07 UTCVendor advisory
  25. 2026-08-14 04:07 UTCGHSA enrichment
  26. 2026-08-13 22:00 UTCEPSS rescore
  27. 2026-08-13 04:48 UTCVendor advisory
  28. 2026-08-13 04:48 UTCGHSA enrichment
  29. 2026-08-12 17:48 UTCEG score recompute
  30. 2026-08-12 17:48 UTCVendor advisory
  31. 2026-08-12 17:48 UTCGHSA enrichment
  32. 2026-08-12 13:50 UTCEPSS rescore
  33. 2026-08-11 16:41 UTCEG score recompute
  34. 2026-08-11 16:41 UTCVendor advisory
  35. 2026-08-11 16:41 UTCGHSA enrichment
  36. 2026-08-11 02:09 UTCEG score recompute
  37. 2026-08-11 02:09 UTCVendor advisory
  38. 2026-08-11 02:09 UTCGHSA enrichment
  39. 2026-08-11 00:00 UTCEPSS rescore
  40. 2026-08-10 12:47 UTCVendor advisory
  41. 2026-08-10 12:47 UTCGHSA enrichment
  42. 2026-08-10 01:19 UTCVendor advisory
  43. 2026-08-10 01:19 UTCGHSA enrichment
  44. 2026-08-09 14:19 UTCEG score recompute
  45. 2026-08-09 14:19 UTCVendor advisory
  46. 2026-08-09 14:19 UTCGHSA enrichment
  47. 2026-08-09 13:46 UTCEPSS rescore
  48. 2026-08-09 03:19 UTCEG score recompute
  49. 2026-08-09 03:19 UTCVendor advisory
  50. 2026-08-09 03:19 UTCGHSA enrichment
  51. 2026-08-08 16:37 UTCEPSS rescore
  52. 2026-08-08 11:11 UTCVendor advisory
  53. 2026-08-08 11:11 UTCGHSA enrichment
  54. 2026-08-07 23:33 UTCEG score recompute
  55. 2026-08-07 23:33 UTCVendor advisory
  56. 2026-08-07 23:33 UTCGHSA enrichment
  57. 2026-08-07 12:34 UTCEG score recompute
  58. 2026-08-07 12:34 UTCVendor advisory
  59. 2026-08-07 12:34 UTCGHSA enrichment
  60. 2026-08-06 13:46 UTCEPSS rescore
  61. 2026-08-06 11:25 UTCVendor advisory
  62. 2026-08-06 11:25 UTCGHSA enrichment
  63. 2026-08-05 23:37 UTCEG score recompute
  64. 2026-08-05 23:37 UTCVendor advisory
  65. 2026-08-05 23:37 UTCGHSA enrichment
  66. 2026-08-05 19:17 UTCEPSS rescore
  67. 2026-08-05 12:37 UTCEG score recompute
  68. 2026-08-05 12:37 UTCVendor advisory
  69. 2026-08-05 12:37 UTCGHSA enrichment
  70. 2026-08-04 15:10 UTCEPSS rescore
  71. 2026-08-04 10:38 UTCEPSS rescore
  72. 2026-08-03 21:01 UTCEG score recompute
  73. 2026-08-03 21:01 UTCVendor advisory
  74. 2026-08-03 21:01 UTCGHSA enrichment
  75. 2026-08-03 10:36 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoC0xFuffM3/CVE-2026-31635-DirtyDecrypt
    First seen May 21, 2026
    Open source ↗
  • GitHub PoC0xBlackash/CVE-2026-31635
    First seen May 19, 2026

    CVE-2026-31635

    Open source ↗

Frequently asked(5)

What is CVE-2026-31635?
CVE-2026-31635 is a high vulnerability published on April 24, 2026. In the Linux kernel, the following vulnerability has been resolved: rxrpc: fix oversized RESPONSE authenticator length check rxgkverifyresponse() decodes auth_len from the packet and is supposed to verify that it fits in the remaining bytes. The existing check is inverted, so oversized RESPONSE…
When was CVE-2026-31635 disclosed?
CVE-2026-31635 was first published in the National Vulnerability Database on April 24, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31635 actively exploited?
CVE-2026-31635 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 41.2% of all scored CVEs.
What is the CVSS score of CVE-2026-31635?
CVE-2026-31635 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-31635?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31635, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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