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ReviewHigh

CVE-2026-74508

Linux

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 al...

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.15
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

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 al...

Affected product and versions

Product
Linux
Affected versions
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 238c333bc4b3f245c626632e8bfa3c9dab97f51b, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 567a2a0a633f2ea5fdccaf3517c09f22c9d860c7, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 97b61241ab45bfa5b0526cb0f3978942493bc811, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2ebf63aa557a69990b4e9ea22be224d58aabce96, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 854194494a6f726a60b90b76059148bf08df023d, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 47778d2c2087b5d192398f6fddf692d16a5431cf, >= 2.6.12
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available