CVE-2026-31536

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

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, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 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:

smb: server: let send_done handle a completion without IB_SEND_SIGNALED

With smbdirect_send_batch processing we likely have requests without IB_SEND_SIGNALED, which will be destroyed in the final request that has IB_SEND_SIGNALED set.

If the connection is broken all requests are signaled even without explicit IB_SEND_SIGNALED.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

April 24, 2026

Last Modified

August 5, 2026

Advisory Details (3)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

smb: server: let send_done handle a completion without IB_SEND_SIGNALED - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9da82dc73cb03e85d716a2609364572367a5ff47
generic

smb: server: let send_done handle a completion without IB_SEND_SIGNALED - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e38b415c024bc3b6321bf8650dbf3f4aab8e74b3
generic

smb: server: let send_done handle a completion without IB_SEND_SIGNALED - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/24082642654f3e5149913946e89c00a297a8868f

Vendor Advisories for CVE-2026-31536(1)

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 @ 6.18.11—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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (350 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (174 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.18~rc7-1~exp1 (101 versions)6.18.12-1—

Data Freshness Timeline

(refreshed 5× in last 7d / 32× 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 292 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-31536?
CVE-2026-31536 is a critical vulnerability published on April 24, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: server: let senddone handle a completion without IBSEND_SIGNALED With smbdirectsendbatch processing we likely have requests without IBSENDSIGNALED, which will be destroyed in the final request that has IBSENDSIGNALED set. If…
When was CVE-2026-31536 disclosed?
CVE-2026-31536 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-2026-31536 actively exploited?
CVE-2026-31536 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.6% of all scored CVEs.
What is the CVSS score of CVE-2026-31536?
CVE-2026-31536 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-31536?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31536, 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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