CVE-2026-74456

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-15. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: 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:

can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error

In peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc() and the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also frees the transfer buffer.

If usb_submit_urb() fails, the error path frees the buffer explicitly with kfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set, usb_free_urb() -> urb_destroy() frees the same buffer a second time, a double free of the transfer buffer.

BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0 Free of addr ffff8881069ccb80 by task trigger.sh/285

Call Trace: kfree+0x113/0x3c0 usb_free_urb.part.0+0x91/0xb0

Drop the redundant kfree(buf); usb_free_urb() already releases the transfer buffer. This mirrors commit 03819abbeb11 ("net: usb: lan78xx: Fix double free issue with interrupt buffer allocation").

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 19, 2026

Advisory Details (5)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dfb17bf04a764462000f11258a7c06aa92d1f261
generic

can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9
generic

can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/92d0de80ca2223b9c7da78020155b6cb27824cc0
generic

can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/525640b93d3e5f82f4ebea4730f4e0cf799522ba
generic

can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4bb3325075138dd5346b71589a959878b564dc0b

Vendor Advisories for CVE-2026-74456(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 32× 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.

  1. 2026-08-21 04:46 UTCEG score recompute
  2. 2026-08-21 04:46 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 17:03 UTCGHSA enrichment
  5. 2026-08-20 05:20 UTCGHSA enrichment
  6. 2026-08-19 17:37 UTCEG score recompute
  7. 2026-08-19 17:37 UTCGHSA enrichment
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-19 16:46 UTCEG score recompute
  10. 2026-08-19 16:46 UTCGHSA enrichment
  11. 2026-08-19 06:07 UTCGHSA enrichment
  12. 2026-08-18 18:20 UTCEG score recompute
  13. 2026-08-18 18:20 UTCGHSA enrichment
  14. 2026-08-18 13:49 UTCEPSS rescore
  15. 2026-08-18 13:49 UTCEPSS rescore
  16. 2026-08-18 06:37 UTCGHSA enrichment
  17. 2026-08-17 18:55 UTCEG score recompute
  18. 2026-08-17 18:55 UTCGHSA enrichment
  19. 2026-08-17 13:47 UTCEPSS rescore
  20. 2026-08-17 06:25 UTCEG score recompute
  21. 2026-08-17 06:25 UTCGHSA enrichment
  22. 2026-08-17 05:55 UTCEG score recompute▲ 7.80
  23. 2026-08-17 05:55 UTCGHSA enrichment
  24. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  25. 2026-08-17 05:25 UTCEG score recompute
Show 7 more
  1. 2026-08-17 05:25 UTCGHSA enrichment
  2. 2026-08-17 05:24 UTCMITRE cvelistV5
  3. 2026-08-16 14:56 UTCEPSS rescore
  4. 2026-08-16 14:56 UTCEPSS rescore
  5. 2026-08-15 13:27 UTCNVD update
  6. 2026-08-15 12:41 UTCEG score recompute
  7. 2026-08-15 12:37 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74456?
CVE-2026-74456 is a high vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: can: peakusb: peakusb_start(): fix double free of transfer buffer on URB submit error In peakusbstart(), each RX URB transfer buffer is allocated with kmalloc() and the URB is flagged URBFREEBUFFER so that the final usbfreeurb()…
When was CVE-2026-74456 disclosed?
CVE-2026-74456 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74456 actively exploited?
CVE-2026-74456 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 97.0% of all scored CVEs.
What is the CVSS score of CVE-2026-74456?
CVE-2026-74456 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-74456?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74456, 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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