CVE-2026-74508

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-15. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: 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:

Bluetooth: HIDP: reject frames without a transaction header

hidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb->data[0] before checking that the L2CAP SDU contains a transaction header. A connected HIDP peer can send an empty basic-mode SDU and make both paths use an uninitialized byte from skb tailroom.

KMSAN reports the use in hidp_session_run(), with the uninitialized value originating in __alloc_skb() through vhci_write(). The control path produces two reports and the interrupt path produces one.

The byte can also be controlled by a malformed lower-layer packet. If an HCI ACL packet contains an L2CAP PDU with a declared zero-length payload followed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb->len to the declared PDU length before dispatch. The current HIDP path nevertheless consumes the extra byte as HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this change, the same packet is discarded and a subsequent feature report request succeeds.

Pull the transaction header with skb_pull_data() and discard frames that do not contain it.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
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

Bluetooth: HIDP: reject frames without a transaction header - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/97b61241ab45bfa5b0526cb0f3978942493bc811
generic

Bluetooth: HIDP: reject frames without a transaction header - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/854194494a6f726a60b90b76059148bf08df023d
generic

Bluetooth: HIDP: reject frames without a transaction header - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/47778d2c2087b5d192398f6fddf692d16a5431cf
generic

Bluetooth: HIDP: reject frames without a transaction header - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec
generic

Bluetooth: HIDP: reject frames without a transaction header - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2ebf63aa557a69990b4e9ea22be224d58aabce96

Vendor Advisories for CVE-2026-74508(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 05:18 UTCEG score recompute
  2. 2026-08-21 05:18 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 17:25 UTCGHSA enrichment
  5. 2026-08-20 05:32 UTCGHSA enrichment
  6. 2026-08-19 17:38 UTCEG score recompute
  7. 2026-08-19 17:38 UTCGHSA enrichment
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-19 16:53 UTCEG score recompute
  10. 2026-08-19 16:53 UTCGHSA enrichment
  11. 2026-08-19 06:39 UTCGHSA enrichment
  12. 2026-08-18 18:43 UTCEG score recompute
  13. 2026-08-18 18:43 UTCGHSA enrichment
  14. 2026-08-18 13:49 UTCEPSS rescore
  15. 2026-08-18 13:49 UTCEPSS rescore
  16. 2026-08-18 06:49 UTCGHSA enrichment
  17. 2026-08-17 18:54 UTCEG score recompute
  18. 2026-08-17 18:54 UTCGHSA enrichment
  19. 2026-08-17 13:47 UTCEPSS rescore
  20. 2026-08-17 06:24 UTCEG score recompute
  21. 2026-08-17 06:24 UTCGHSA enrichment
  22. 2026-08-17 05:55 UTCEG score recompute▲ 8.80
  23. 2026-08-17 05:55 UTCGHSA enrichment
  24. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  25. 2026-08-17 05:39 UTCEG score recompute
Show 7 more
  1. 2026-08-17 05:39 UTCGHSA enrichment
  2. 2026-08-17 05:39 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 12:39 UTCEG score recompute
  7. 2026-08-15 12:37 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74508?
CVE-2026-74508 is a high vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: reject frames without a transaction header hidprecvctrlframe() and hidprecvintrframe() read skb->data[0] before checking that the L2CAP SDU contains a transaction header. A connected HIDP peer can send an empty…
When was CVE-2026-74508 disclosed?
CVE-2026-74508 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-2026-74508 actively exploited?
CVE-2026-74508 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 82.9% of all scored CVEs.
What is the CVSS score of CVE-2026-74508?
CVE-2026-74508 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-74508?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74508, 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.

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