CVE-2026-74508Bluetooth: HIDP: reject frames without a transaction header
- 8.8HighCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 82% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 82% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 238c333bc4b3f245c626632e8bfa3c9dab97f51b
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 567a2a0a633f2ea5fdccaf3517c09f22c9d860c7
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 97b61241ab45bfa5b0526cb0f3978942493bc811
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 2ebf63aa557a69990b4e9ea22be224d58aabce96
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 854194494a6f726a60b90b76059148bf08df023d
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 47778d2c2087b5d192398f6fddf692d16a5431cf
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.266 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.151 – ≤ 6.6.*
- unaffected 6.12.103 – ≤ 6.12.*
- unaffected 6.18.44 – ≤ 6.18.*
- unaffected 7.1.8 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8 (opens in a new tab)
- https://git.kernel.org/stable/c/238c333bc4b3f245c626632e8bfa3c9dab97f51b (opens in a new tab)
- https://git.kernel.org/stable/c/567a2a0a633f2ea5fdccaf3517c09f22c9d860c7 (opens in a new tab)
- https://git.kernel.org/stable/c/46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec (opens in a new tab)
- https://git.kernel.org/stable/c/97b61241ab45bfa5b0526cb0f3978942493bc811 (opens in a new tab)
- https://git.kernel.org/stable/c/2ebf63aa557a69990b4e9ea22be224d58aabce96 (opens in a new tab)
- https://git.kernel.org/stable/c/854194494a6f726a60b90b76059148bf08df023d (opens in a new tab)
- https://git.kernel.org/stable/c/47778d2c2087b5d192398f6fddf692d16a5431cf (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-59701 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-74508)Record last updated .