CVE-2026-74608

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-22. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
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: client: Fix use-after-free in cifs_try_adding_channels()

cifs_try_adding_channels() takes a temporary reference to an interface before dropping iface_lock. If cifs_ses_add_channel() fails, it drops that reference and then increments iface->weight_fulfilled.

A concurrent interface list refresh can remove the list reference while channel creation is in progress. In that case, the failure-path kref_put() releases the last reference and frees iface. Updating weight_fulfilled afterward then accesses freed memory.

Increment weight_fulfilled before dropping the temporary reference, keeping iface alive for the final access.

CVSS v3
9.8
EG Score
9.8(high)
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
39%
KEV
Not listed

Published

August 22, 2026

Last Modified

August 25, 2026

Advisory Details (6)

Auto-updated Aug 25, 2026
No patch confirmed yet.
generic

smb: client: Fix use-after-free in cifs_try_adding_channels() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c292d4686f717c03e5022fc4ae7c782f39a94915
generic

smb: client: Fix use-after-free in cifs_try_adding_channels() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/64d7584e62ac8cdc750455c5fdc6008fc2de4f06
generic

smb: client: Fix use-after-free in cifs_try_adding_channels() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4986410316b1ae0e63c6ce418e4eb196723626e7
generic

smb: client: Fix use-after-free in cifs_try_adding_channels() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/47dfac48bce7198ad4f1a388fc8c9491f878ac3b
generic

smb: client: Fix use-after-free in cifs_try_adding_channels() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1ffacbadc14530e55b8d86f7b917524f6a0fb891
generic

smb: client: Fix use-after-free in cifs_try_adding_channels() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805

Vendor Advisories for CVE-2026-74608(1)

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

Data Freshness Timeline

(refreshed 46× in last 7d / 49× 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.

  1. 2026-08-30 03:41 UTCEG score recompute
  2. 2026-08-30 03:41 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 23:53 UTCGHSA enrichment
  5. 2026-08-29 20:06 UTCGHSA enrichment
  6. 2026-08-29 16:15 UTCGHSA enrichment
  7. 2026-08-29 12:26 UTCGHSA enrichment
  8. 2026-08-29 08:32 UTCGHSA enrichment
  9. 2026-08-29 04:44 UTCGHSA enrichment
  10. 2026-08-29 00:56 UTCEG score recompute
  11. 2026-08-29 00:56 UTCGHSA enrichment
  12. 2026-08-28 21:42 UTCEPSS rescore
  13. 2026-08-28 16:30 UTCGHSA enrichment
  14. 2026-08-28 11:51 UTCGHSA enrichment
  15. 2026-08-28 08:04 UTCGHSA enrichment
  16. 2026-08-28 04:12 UTCGHSA enrichment
  17. 2026-08-28 00:24 UTCGHSA enrichment
  18. 2026-08-27 20:34 UTCGHSA enrichment
  19. 2026-08-27 16:37 UTCEG score recompute
  20. 2026-08-27 16:37 UTCGHSA enrichment
  21. 2026-08-27 14:25 UTCEPSS rescore
  22. 2026-08-27 12:49 UTCGHSA enrichment
  23. 2026-08-27 09:01 UTCGHSA enrichment
  24. 2026-08-27 05:14 UTCGHSA enrichment
  25. 2026-08-27 01:26 UTCGHSA enrichment
Show 24 more
  1. 2026-08-26 21:39 UTCGHSA enrichment
  2. 2026-08-26 17:51 UTCEG score recompute
  3. 2026-08-26 17:51 UTCGHSA enrichment
  4. 2026-08-26 14:47 UTCEPSS rescore
  5. 2026-08-26 12:56 UTCGHSA enrichment
  6. 2026-08-26 09:09 UTCGHSA enrichment
  7. 2026-08-26 05:17 UTCGHSA enrichment
  8. 2026-08-26 01:28 UTCGHSA enrichment
  9. 2026-08-25 21:41 UTCGHSA enrichment
  10. 2026-08-25 17:53 UTCGHSA enrichment
  11. 2026-08-25 14:06 UTCEG score recompute
  12. 2026-08-25 14:06 UTCGHSA enrichment
  13. 2026-08-25 13:49 UTCEPSS rescore
  14. 2026-08-25 10:17 UTCEG score recompute
  15. 2026-08-25 10:17 UTCGHSA enrichment
  16. 2026-08-25 06:30 UTCEG score recompute
  17. 2026-08-25 06:30 UTCGHSA enrichment
  18. 2026-08-25 05:45 UTCEG score recompute▲ 9.80
  19. 2026-08-25 05:45 UTCGHSA enrichment
  20. 2026-08-25 05:45 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  21. 2026-08-24 14:18 UTCEPSS rescore
  22. 2026-08-22 16:24 UTCNVD update
  23. 2026-08-22 15:42 UTCEG score recompute
  24. 2026-08-22 15:35 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74608?
CVE-2026-74608 is a critical vulnerability published on August 22, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix use-after-free in cifstryadding_channels() cifstryadding_channels() takes a temporary reference to an interface before dropping ifacelock. If cifssesaddchannel() fails, it drops that reference and then increments…
When was CVE-2026-74608 disclosed?
CVE-2026-74608 was first published in the National Vulnerability Database on August 22, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74608 actively exploited?
CVE-2026-74608 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 60.8% of all scored CVEs.
What is the CVSS score of CVE-2026-74608?
CVE-2026-74608 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-74608?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74608, 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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