CVE-2026-89636

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

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

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-11. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

smb: client: clear ce->tgthint in free_tgts()

When free_tgts() frees all structures in ce->tlist, ce->tgthint is left pointing to one of the freed cache_dfs_tgt structures.

If ce->tgthint is not reset before it is used later, it results in a use-after-free.

Set ce->tgthint to NULL in free_tgts() after the elements are freed to reflect that no elements remain.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from 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.
EPSS PROB
0.7%
EPSS %ILE
50th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from 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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” 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

September 11, 2026

Last Modified

September 14, 2026

Advisory Details (6)

Auto-updated Oct 13, 2026
Patch available.
Web page

smb: client: clear ce->tgthint in free_tgts() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b1b741cf8e7ce1b91d937e23decd3d3358748700
Web page

smb: client: clear ce->tgthint in free_tgts() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9ab46a13798a61d9d020b01d4e57efdabe6624fa
Web page

smb: client: clear ce->tgthint in free_tgts() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7507bd1885643d0461a6017767492450af1ce2a3
Web page

smb: client: clear ce->tgthint in free_tgts() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5baab40404a9393bcc0b7b8f1950bf2c307e0984
Web page

smb: client: clear ce->tgthint in free_tgts() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3ff9462bb7a06d8d32a1dc02d39580b078ec9e55
Web page

smb: client: clear ce->tgthint in free_tgts() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/14f60e959b5ac813715ff72e127beb3584ddabf6

Vendor Advisories for CVE-2026-89636(1)

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

Affected Packages

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (360 versions)
  • every version on: no fix on record
—
linux-6.126.12.100-1~deb12u1, 6.12.101-1~deb12u1, 6.12.107-1~deb12u1
  • every version up to 6.12.111-1~deb12u1: fixed in 6.12.111-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (35 versions)
  • every version up to 6.12.111-1: fixed in 6.12.111-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (179 versions)
  • every version up to 7.2.6-1: fixed in 7.2.6-1
—

Data Freshness Timeline

(refreshed 43× in last 7d / 211× 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 100 of 229 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. None are among the latest 100 rows. The 129 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 10:13 UTCEG score recompute
  2. 2026-10-14 10:13 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  4. 2026-10-13 08:35 UTCEG score recompute
  5. 2026-10-13 08:35 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  6. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  7. 2026-10-12 14:48 UTCEG score recompute
  8. 2026-10-12 09:06 UTCEG score recompute
  9. 2026-10-12 09:05 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  10. 2026-10-11 21:06 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-11 19:15 UTCEG score recompute
  12. 2026-10-11 16:31 UTCEG score recompute
  13. 2026-10-11 16:01 UTCEG score recompute
  14. 2026-10-11 16:01 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  16. 2026-10-11 13:47 UTCEG score recompute
  17. 2026-10-11 11:40 UTCEG score recompute
  18. 2026-10-11 11:40 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-11 06:50 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-10 23:07 UTCEG score recompute
  21. 2026-10-10 23:07 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  23. 2026-10-10 18:45 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-10 14:23 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-10-10 10:02 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
Show 75 more
  1. 2026-10-10 05:41 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-10-10 01:18 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-10-09 20:53 UTCEG score recompute
  4. 2026-10-09 20:53 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  6. 2026-10-09 16:31 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-09 07:57 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-09 03:36 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-10-08 23:14 UTCEG score recompute
  10. 2026-10-08 23:14 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  12. 2026-10-08 08:42 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-10-08 04:22 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-08 00:01 UTCEG score recompute
  15. 2026-10-08 00:01 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  17. 2026-10-07 19:41 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-07 12:56 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-07 08:08 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-07 03:47 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-10-06 23:26 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-06 19:05 UTCEG score recompute
  23. 2026-10-06 19:05 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  25. 2026-10-06 14:39 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  26. 2026-10-06 10:18 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  27. 2026-10-06 05:36 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  28. 2026-10-06 01:05 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  29. 2026-10-05 20:42 UTCEG score recompute
  30. 2026-10-05 20:42 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  31. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  32. 2026-10-05 16:22 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  33. 2026-10-05 11:04 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  34. 2026-10-05 06:36 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  35. 2026-10-05 02:15 UTCEG score recompute
  36. 2026-10-05 02:15 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  37. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  38. 2026-10-04 21:51 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  39. 2026-10-04 17:31 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  40. 2026-10-04 13:10 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  41. 2026-10-04 08:50 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  42. 2026-10-04 04:29 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  43. 2026-10-04 00:09 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  44. 2026-10-03 19:09 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  45. 2026-10-03 14:49 UTCEG score recompute
  46. 2026-10-03 14:48 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  47. 2026-10-03 10:12 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  48. 2026-10-03 04:27 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  49. 2026-10-03 00:06 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  50. 2026-10-02 18:59 UTCEG score recompute
  51. 2026-10-02 18:59 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-10-02 14:39 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  53. 2026-10-02 10:06 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-10-02 05:45 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  55. 2026-10-02 00:21 UTCEG score recompute
  56. 2026-10-02 00:21 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  57. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  58. 2026-10-01 19:06 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-10-01 13:48 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  60. 2026-10-01 09:28 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  61. 2026-10-01 05:07 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-10-01 00:47 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  63. 2026-09-30 19:21 UTCEG score recompute
  64. 2026-09-30 19:21 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  65. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  66. 2026-09-30 15:01 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-09-30 10:40 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  68. 2026-09-30 06:03 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  69. 2026-09-30 01:42 UTCEG score recompute
  70. 2026-09-30 01:42 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-09-29 13:48 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  72. 2026-09-29 09:18 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  73. 2026-09-29 04:58 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8
  74. 2026-09-29 00:37 UTCEG score recompute
  75. 2026-09-29 00:37 UTCGHSA enrichmentGHSA-4452-h45j-w5mp · GitHub severity CRITICAL · GitHub CVSS 9.8

Frequently asked(5)

What is CVE-2026-89636?
CVE-2026-89636 is a critical-severity vulnerability; its CVE record was published on September 11, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: clear ce->tgthint in free_tgts() When free_tgts() frees all structures in ce->tlist, ce->tgthint is left pointing to one of the freed cachedfstgt structures. If ce->tgthint is not reset before it is used later, it…
When was the CVE record for CVE-2026-89636 published?
The CVE record for CVE-2026-89636 was published on September 11, 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 September 14, 2026; the record at its source may have been updated since.
Is CVE-2026-89636 actively exploited?
CVE-2026-89636 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (50th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-89636?
CVE-2026-89636 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-89636?
A fix for CVE-2026-89636 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-89636 are linked in the Vendor Advisories panel on this page.

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